CN114878155A

CN114878155A - Driving structure for load test

Info

Publication number: CN114878155A
Application number: CN202210580563.7A
Authority: CN
Inventors: 不公告发明人
Original assignee: Taizhou Wonderful Machinery Co ltd
Current assignee: ZHEJIANG AILA BUILDING ENERGY SAVING TECHNOLOGY Co.,Ltd.
Priority date: 2022-05-25
Filing date: 2022-05-25
Publication date: 2022-08-09
Anticipated expiration: 2042-05-25
Also published as: CN114878155B

Abstract

The invention discloses a driving structure for a load test, belongs to the technical field of rocker arm experimental equipment, and provides a driving structure for the load test of a static load test device of a rocker arm, which has a reliable structure and does not influence the self structure degree and equipment stability of the rocker arm in the test process; the device comprises a hydraulic testing mechanism and a testing head arranged at the end part of the hydraulic testing mechanism; the hydraulic pressure accredited testing organization includes: the device comprises a cylinder, a driving piston, a piston buffer head and a buffer receiving piece.

Description

Driving structure for load test

Technical Field

The invention belongs to the technical field of rocker arm experimental equipment, and particularly relates to a driving structure for a load test.

Background

The rocker arm is a part for changing the load direction in an engine valve mechanism, the rocker arm is provided with an inner hole, a rocker arm shaft is assembled in the inner hole, and the rocker arm swings around the rocker arm shaft in a reciprocating mode to realize opening and closing of an exhaust valve. According to the stressed characteristic of valve train parts, the load on the rocker arm is a pulsating characteristic, i.e. the characteristic load with the load amplitude equivalent to the load average value.

The existing test device structure for testing the static load of the rocker arm is that a hydraulic drive device drives a loading column to abut against the rocker arm and apply pressure in a pulse loading mode, pressure is changed through a pressure regulating valve and other structures to apply pressure to the rocker arm, so that the test of the load of the rocker arm is realized, the rocker arm can be driven to vibrate in the moment that the reinforcing column abuts against the rocker arm in the test process, the test stability of the device is influenced, and the loading column directly abuts against the rocker arm without a good buffer structure, if the impact force is too large due to unstable pressure of oil pressure output by the hydraulic drive device or fluctuation in the pressure changing process, the qualified rocker arm is easily damaged in the incomplete whole test process, and the test accuracy is easily influenced.

Disclosure of Invention

The invention aims to solve the technical problems, and provides a driving structure for a load test of a static load test device of a rocker arm, which has a reliable structure and does not influence the structural strength and the equipment stability of the rocker arm in the test process.

The purpose of the invention is realized as follows: a driving structure for a load test comprises a hydraulic testing mechanism and a testing head arranged at the end part of the hydraulic testing mechanism;

the hydraulic pressure accredited testing organization includes:

the mounting cylinder body is arranged on the lower side of the supporting rod, a sealing cover is in threaded connection with one side, connected with the supporting rod, of the mounting cylinder body, the mounting cylinder body is fixedly connected with the supporting rod through the sealing cover, and a first oil hole is formed in the side wall, close to the sealing cover, of the mounting cylinder body;

the driving piston is arranged in the mounting cylinder, an extension chamber with variable volume is formed between the driving piston and the mounting cylinder, and the first oil hole is communicated with the extension chamber; a testing rod extending out of the cylinder is formed at one end of the driving piston, which is far away from the supporting rod, and the driving piston is connected with the testing rod through threads; the driving piston comprises a plurality of piston ring sets, a reset chamber is arranged between the piston ring sets, a bearing ring which is abutted against the side wall of the driving piston and separates the reset chamber is formed on the inner wall of the mounting cylinder, a bearing chamber with variable capacity is formed between the reset chamber and the bearing ring, a second oil hole which is communicated with the bearing chamber is formed in the side wall of the mounting cylinder, and the volume between the reset chamber and the bearing ring is changed in the process of the movement of the driving piston; wherein the volume of the receiving chamber is reduced in the process of extending the test rod, and the volume of the receiving chamber is increased in the process of retracting the test rod; the volume of the extension chamber is increased in the process of extending the test rod, and is decreased in the process of retracting the test rod.

The piston ring group is provided with a sealing groove, and the sealing groove is provided with a sealing ring;

the piston buffer head is provided with a buffer mounting hole on the driving piston, the piston buffer head is fixedly arranged on the buffer mounting hole, a plurality of piston abutting blocks which are uniformly distributed are arranged on the end surface of the piston buffer head and positioned on the outer edge of the buffer mounting hole, and one side of the piston buffer head abuts against the piston abutting blocks;

the buffering adapting piece is arranged between the outer wall of the driving piston and the testing rod.

In the technical scheme, the extending chamber is filled with oil through the first oil hole, so that high-pressure oil pushes the driving piston to move, the volume of the extending chamber is increased, the testing rod is driven to extend, the volume of the receiving chamber is reduced, and hydraulic oil in the receiving chamber is discharged through the second oil hole; and have the oilhole to accept the room through past the second and carry out the oiling for high-pressure fluid promotes the drive piston to settling the barrel bottom motion, makes and accepts the room volume grow, and drives the test rod and stretch out, and the volume that stretches out the cavity at this moment diminishes, and will stretch out the hydraulic oil in the cavity and discharge through first oilhole, thereby accomplished the action of stretching out and retracting of test rod, and then realize carrying out pulse loading and exerting pressure to the rocking arm, thereby realize the purpose of load test.

In the above technical solution, it is further provided that the piston buffer head includes:

the buffer fixing bolt comprises a bolt head and a bolt handle which are fixedly connected, the bolt handle is in threaded connection with the buffer mounting hole, a coaxially arranged flow cavity is arranged in the bolt handle, a plurality of first pressure relief holes communicated with the flow cavity are formed in the outer wall of the bolt handle close to one side of the buffer mounting hole, the first pressure relief holes are communicated with gaps between adjacent piston abutting blocks, and a plurality of groups of second pressure relief holes communicated with the flow cavity are formed in the outer wall of the bolt handle close to one side of the bolt head;

the buffer head comprises a buffer head shell, a stepped hole is formed on the inner side of the buffer head shell, one end of the stepped hole is open, the other end of the stepped hole is closed, the diameter of the section of the outer wall of the buffer head shell close to the open end of the stepped hole is larger than that of the section close to the closed end, and the outer wall of one side of the outer wall of the buffer head shell with the larger diameter is connected with the inner wall of the accommodating cylinder in a sliding mode; one end of the buffer head shell closed by the stepped hole is sleeved on the bolt handle and is in sliding connection with the bolt handle, and the end face of the buffer head shell is abutted against the end part of the piston abutting block; a plurality of first flow grooves which axially extend are arranged on the outer wall of one side of the buffer head shell with the large diameter;

the bolt handle is provided with a buffer inner core which is connected with the bolt handle in a sliding way and is limited by the bolt head, the buffer inner core is positioned at the opening side of the stepped hole on the buffer head shell, the outer wall of the buffer inner core is connected with the stepped hole of the buffer head shell in a sliding way, and the outer wall of the buffer inner core is provided with a plurality of second flow grooves which extend along the axial direction;

the buffer head supporting spring is arranged in the stepped hole of the buffer head shell, and two ends of the buffer head supporting spring are respectively abutted against the closed section of the stepped hole and the buffer inner core. Wherein the first flow channel and the second flow channel are shallow grooves, and the second flow channel, the first pressure relief hole, the flow cavity, the second pressure relief hole and the first flow channel are communicated in sequence, and oil can flow in a circulating manner.

In the technical scheme, when the buffer piston drives the test rod to extend out and abut against the rocker arm, impact can be generated instantly, an acting force for pressing the test rod into the accommodating barrel is generated on the rocker arm, vibration is generated simultaneously, the hydraulic oil forms a reaction force abutting against the buffer piston at the bottom of the buffer piston, the buffer inner core is arranged to enable the reaction force of the hydraulic oil not to be applied to the buffer piston, and the buffer inner core axially floats in the buffer head shell under the action-proof force of the hydraulic oil and the support of the buffer head support spring at the moment, so that the reaction force of the hydraulic oil is integrated through the floating of the buffer inner core, the shaking probability of the buffer piston and the test rod is reduced, and a good buffer and shock-absorbing effect is achieved at the bottom of the buffer piston; meanwhile, hydraulic oil can flow in the first flow groove, the second flow groove, the flow cavity, the first pressure relief hole and the second pressure relief hole in the floating process of the buffering inner core, so that the buffering inner core is ensured to move and the situation that the oil pressure in the extending cavity is unstable is avoided.

In the technical scheme, the test rod is in a stepped shaft shape with a large upper part and a small lower part, the test head is arranged on one section of end part with a small diameter of the test rod, the other section of end part with a small diameter of the side view rod is provided with a stepped buffer part, the stepped buffer part comprises a first stepped part, a second stepped part and a third stepped part which are gradually reduced in diameter and sequentially connected, and the section diameter of the first stepped part is larger than that of the test rod;

the test head includes:

the test head comprises a test head shell, a cylindrical test cavity is formed in the test head shell, an opening is formed in one end of the test cavity, the test head shell is coaxially sleeved at the end part of a test rod through the opening, a step buffer part is located in the test cavity, and a first step part is in sliding fit with the test cavity; a cut-in part with a circular section and a diameter larger than that of the test cavity is arranged on the inner wall of the test cavity, extends from the opening to the bottom of the test cavity and forms a certain distance with the diameter of the bottom of the test cavity;

the outer sealing block is internally provided with a sealing fixing groove in the opening of the test cavity, the sealing fixing groove is provided with an outer sealing block for plugging the opening, the outer wall of the outer sealing block is provided with a retaining ratchet part, and the outer sealing block is clamped on the sealing fixing groove through the retaining ratchet part;

the sealing limiting ring is arranged in the testing cavity and is positioned at the position of the cut-in part close to the bottom of the testing cavity, and the sealing limiting groove is provided with the sealing limiting ring; the sealing limiting ring is sleeved on the test rod and is connected with the test rod in a sliding manner, and the stepped buffering part is limited in the test cavity positioned at the inner side of the sealing limiting groove;

the limiting buffer sleeve is arranged on the cut-in part on the inner side of the sealing limiting groove, the outer wall of the limiting buffer sleeve is in a step shape, the diameter of the outer wall close to the bottom of the test cavity is small, the limiting buffer sleeve is in sliding fit with the cut-in part through the outer wall on one side with the large diameter, and the end face on one side with the large diameter of the outer wall of the limiting buffer sleeve is abutted to the end face of the first step part;

a limit fixed sleeve is connected with the third step part in a threaded manner and is abutted against the end surface of the second step part, a sleeve supporting edge is formed on the limit fixed sleeve in the direction towards the bottom of the test cavity,

the test head inner supporting spring is arranged in the test cavity on the inner side of the limiting fixed sleeve, two ends of the test head inner supporting spring respectively abut against the bottom of the test cavity and the limiting fixed sleeve, and the test head inner supporting spring is limited by the buffering positioning edge and the sleeve supporting edge. And a buffer solution is filled in the test cavity at the inner side of the sealing limit ring.

In the technical scheme, the instant that the buffer piston drives the test rod to extend out and abut against the rocker arm can generate impact, the end part of the test rod can vibrate, and the arranged test head can play a good shock absorption and buffering effect at the end part of the test rod; the step buffer part can move towards the bottom of the test cavity at the moment that the test rod abuts against the rocker arm, and the buffer liquid is filled, so that the step buffer part has a good buffer effect when moving, and the test head floats relative to the end part of the test rod under the action of the support spring in the test head, so that impact force is integrated and vibration is reduced; and first step portion and test chamber sliding fit make first step portion and cut into between the portion and formed the clearance to make buffer solution flow to the position between first step portion and the sealed spacing ring, and the sealed spacing ring that sets up can prevent that the buffer solution from flowing, spacing buffer sleeve is through one side outer wall that the diameter is big and cut into sliding fit, thereby can be spacing to spacing buffer sleeve's floating, and then can restrict the displacement range of step buffer portion, thereby can better must guarantee the effect of test head shock attenuation buffering.

In the above technical solution, it is further provided that the test head further includes:

the outer fixing ring is sleeved on the test rod and is in threaded connection with the outer side of the opening of the test cavity on the test head shell, abuts against the end face of the test head shell and limits the outer sealing block in the test head shell;

the inner sealing abutting block is arranged in the test cavity and abutted against the sealing limiting ring, a plurality of sealing ribs which are arranged at equal intervals and have arc-shaped cross sections are formed on the outer side of the inner sealing abutting block, the sealing ribs abut against the cut-in part, a concave sealing bearing groove is formed on the end surface of one side, close to the sealing limiting ring, of the inner sealing abutting block, and the bottom of the sealing bearing groove is arc-shaped;

the outer support spring of the test head is arranged and sleeved on the test rod, two ends of the outer support spring of the test head respectively abut against the inner sealing abutting block and the outer sealing block, sealing fixed edges which are symmetrical to each other are respectively arranged on the inner sealing abutting block and the outer sealing block, and two ends of the outer support spring of the test head are respectively clamped on the sealing fixed edges of the inner sealing abutting block and the outer sealing block. Wherein the outer sealing block and the inner sealing resisting block are made of sealing rubber, and the sealing limiting ring and the fixing ring are made of metal materials.

In this technical scheme, the inner seal supports the piece and can support sealed spacing ring and play good sealed effect outside sealed spacing ring, and the test head outer support spring that sets up can play good elastic support's effect to the inner seal supports the piece to can play the effect that prevents the outer seal piece and drop through the outer solid fixed ring that sets up.

In the above technical solution, it is further provided that the cushion receiving member includes:

the middle bearing piece is sleeved at the middle part of the section with the larger diameter of the test rod and floats up and down on the test rod,

an upper buffer support, the upper end of the upper buffer support is arranged on the outer wall of the driving piston, the other end is arranged on the testing rod above the middle bearing piece,

the upper end of the lower buffer support piece is arranged on the part of the testing rod with large diameter below the middle bearing piece, and the other end of the lower buffer support piece is arranged at the joint of the section with large diameter and the section with small diameter of the testing rod;

wherein the intermediate socket member includes:

the middle floating ring is sleeved on the testing rod and is in sliding fit with the testing rod, and a plurality of bearing holes which are uniformly distributed according to the circumference and penetrate through the testing rod in the radial direction are formed in the middle of the testing rod; one end of the bearing hole close to the test rod is arc-shaped, and one end far away from the test rod is provided with connecting threads inwards;

the bottom of each bearing hole is provided with a floating ball core which can roll freely, the outer wall of the test rod is provided with two arc floating grooves, and the floating ball core partially extends out of the bearing holes and is matched with the floating grooves in a rolling way;

a fastening screw which is connected with the bearing hole in a threaded manner and prevents the floating ball core from falling out,

a floating elastic block which is arranged in the bearing hole and is pressed against the floating ball core, the floating elastic block is matched with the bearing hole in a sliding way,

and the floating spring is arranged in the bearing hole, and two ends of the floating spring are respectively abutted against the floating elastic block and the fastening screw.

In the technical scheme, the middle bearing piece is arranged and matched with the upper buffering support piece and the lower buffering support piece, so that a good buffering effect is achieved between the testing rod and the mounting cylinder body at the moment that the testing rod abuts against the rocker arm, and a good buffering and damping effect of the testing mechanism is better ensured; the middle floating ring is positioned by arranging the floating ball core and the floating spring, when the two sides of the middle floating ring are stressed, the floating ball core is pressed into the middle floating ring under the support of the floating spring, and then moves in the direction of the force under the action of the upper buffer support piece or the lower buffer support piece, and because the outer wall of the testing rod is provided with two arc floating grooves, the floating or moving positions of the middle floating ring and the floating ball core are limited, so that good positioning and limiting effects are achieved on the middle floating ring, and the situation that the buffering effect is poor due to the fact that the displacement of the middle floating ring is too large is avoided; meanwhile, the meshing degree between the fastening screw and the connecting thread of the bearing hole can be adjusted, so that the pre-tightening force of the floating spring can be adjusted, and a good positioning effect of the floating spring is ensured. The floating elastic block can play a good bearing effect on the floating spring and is made of rubber materials.

In the above technical solution, it is further provided that the intermediate receiving member further includes:

the upper limiting ring is connected with the testing rod on the upper side of the middle floating ring in a threaded manner;

the lower limit ring is connected with the testing rod on the lower side of the middle floating ring in a threaded manner;

wherein the state motion of the middle floating ring in the working process of the test rod comprises the following steps:

the lower limit ring moves downwards under the action of the upper buffer support piece and is propped against the lower limit ring,

the upper limit ring moves upwards under the action of the lower buffer support piece and is propped against the upper limit ring.

In the technical scheme, the upper limiting ring and the lower limiting ring can further limit the position of the middle floating ring, so that the middle floating ring is prevented from greatly deviating; the middle floating ring moves towards the lower limiting ring direction and is abutted against the lower limiting ring under the action of the upper buffering support piece, and moves towards the upper limiting ring direction and is abutted against the upper limiting ring under the action of the lower buffering support piece, so that the good floating effect of the middle floating ring is ensured through the matching of the lower buffering support piece and the upper buffering support piece; when the test rod extends to abut against the rocker arm, a reaction force for retracting the test rod is generated at the moment, and a part of the reaction force is integrated under the common buffer action of the upper buffer support piece and the lower buffer support piece, so that the buffer effects of the hydraulic test mechanism and the test mechanism are further ensured.

In the above technical solution, it is further provided that the upper cushion support includes:

the upper positioning ring is fixed on the outer wall of the driving piston through threads;

the upper support frame is sleeved on the outer wall of the driving piston, is in sliding fit with the outer wall of the driving piston, and extends downwards from the lower side of the upper support frame to form an upper limiting edge;

the lower support frame is sleeved on the test rod and close to one side of the upper limiting ring, is in sliding fit with the outer wall of the test rod, is provided with a lower limiting edge extending upwards on the upper side of the lower support frame, and is provided with a lower pressing part extending downwards and abutting against the middle floating ring on the lower side of the lower support frame;

the upper buffering support spring is sleeved outside the driving piston and positioned between the upper support frame and the lower support frame, two ends of the upper buffering support spring are respectively abutted against the upper limiting edge and the lower limiting edge, and the upper buffering support spring is in a compressed state when the test rod retracts; and the upper support frame is propped against the lower side of the upper positioning ring through the upper buffering support ring, and the lower pressing part of the lower support frame is propped against the middle floating ring.

In this technical scheme, it is used for spacing upper bracket not up to remove to go up the holding ring, and make the direction displacement of lower carriage towards keeping away from upper bracket under the effect of last buffering supporting spring, and because last buffering supporting spring is compression state when the test bar retracts, thereby support the floating ring in the middle of with the lower carriage all the time when the test bar stretches out, thereby make middle floating ring be in on one side that leans on lower holding ring, and lower carriage and last buffering supporting spring can play good buffering absorbing effect to it when middle floating ring upwards floats, thereby the good floatability of middle floating ring has been ensured.

In the above technical solution, it is further provided that the lower cushion support includes:

the upper buffer frame is sleeved outside the test rod and positioned on the lower side of the lower limiting ring, the upper buffer frame is connected with the test rod in a sliding manner, an upper abutting part abutting against the lower side of the middle floating ring is formed on the upper side of the upper buffer frame, and an upper receiving edge extending downwards is formed on the lower side of the upper buffer frame;

the lower buffer frame is arranged at the joint of the section with the large diameter and the section with the small diameter of the test rod and is abutted against the end face of the section with the large diameter of the test rod, and a lower bearing edge is formed on the upper side of the lower buffer frame in the upward direction;

the lower positioning ring is connected with a section of the test rod with a small diameter through threads and used for limiting the lower buffer frame;

the lower buffering support spring is sleeved on the test rod and located between the upper buffering frame and the lower buffering frame, two ends of the lower buffering support spring are respectively abutted to the upper limiting edge and the lower limiting edge, and an upper abutting portion of the lower buffering support spring is abutted to the middle floating ring through the lower buffering spring. The lower buffering support spring is in a relaxed state in a normal state, and the acting force of the lower buffering support spring against the middle floating ring is slightly larger than the acting force of the test rod which completely extends out of the lower buffering support spring and presses against the middle floating ring, but the floating ball core cannot press into the middle floating ring.

In this technical scheme, thereby lower holding ring and to having played fixed down to lower buffer frame with to the big one section of terminal surface cooperation of test bar diameter, and because go up the buffering with last buffer frame and test bar sliding connection, and go up the buffer frame and support on middle floating ring, in the moment that the test bar is supporting to the rocking arm, go up the buffer frame and can produce the trend to settling the barrel direction removal along with the test bar, make the lower buffer spring between last buffer frame and the lower buffer frame compress, and with the power effect on middle floating ring, and because the other end of middle floating ring is supported by last buffering support spring, thereby the moment that appears the impact force makes lower buffering support spring compression drive and go up the buffering and support to middle floating ring, thereby make middle floating ring produce and float, and then offset some impact force and reach certain buffering shock attenuation effect.

In the technical scheme, the oil pressure testing device is further provided with an electromagnetic valve respectively arranged on the first oil hole and the second oil hole, a control cabinet, a hydraulic driving device and an oil tank are arranged outside the oil pressure testing device, a controller and a control circuit are arranged in the control cabinet, the action of the experimental device is controlled by the controller in a programming mode, the hydraulic testing mechanism is located on one side far away from the testing fixture under the condition of no testing, and the telescopic driving platform is in an extending state; the hydraulic driving device is a pump which adopts a pulse loading mode to load or other existing hydraulic structures, a pressure regulating valve and other structures for regulating oil pressure are arranged on a pipeline for conveying hydraulic oil, and the pressure regulating valve and the like can be programmed and controlled by a controller. The solenoid valve is two-position three-way solenoid valve to can realize carrying oil or arranging oil through an oilhole.

The test method of the experimental device comprises the following steps:

the method comprises the following steps: sleeving a rocker arm to be tested on a rocker arm mounting shaft,

step two: the rotation of the rotating platform is controlled by the controller, so as to drive the hydraulic testing mechanism on the supporting rod to rotate in the reverse direction of the test fixture,

step three, the controller drives the telescopic driving table to retract so that the hydraulic testing mechanism is abutted to the valve end of the rocker arm,

and fourthly, driving a hydraulic testing mechanism to carry out load testing on the valve end of the rocker arm by the controller.

In the technical scheme, the rocker arm can be automatically tested by adopting the steps, so that the convenience of the device is improved.

Drawings

FIG. 1 is a schematic diagram of a test apparatus for use in the present invention;

FIG. 2 is a side view of a test fixture in a test apparatus for use with the present invention;

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is a schematic diagram of the structure of a test head according to the present invention;

FIG. 5 is a schematic view of the construction of the intermediate adapter of the present invention;

FIG. 6 is a schematic view of the structure of the piston cushion head according to the present invention;

FIG. 7 is a cross-sectional view taken at A-A in FIG. 6;

reference numbers in the drawings and corresponding part names: 1-test fixture, 2-telescopic driving table, 3-rotating table, 4-supporting rod, 5-balancing weight, 6-arranging cylinder, 7-driving piston, 8-testing rod, 9-bearing ring, 10-bearing chamber, 11-second oil hole, 12-sealing ring, 13-buffering mounting hole, 14-piston contact block, 15-buffering fixing bolt, 16-flow cavity, 17-first pressure relief hole, 18-second pressure relief hole, 19-buffering head shell, 20-first flow groove, 21-buffering inner core, 22-second flow groove, 23-buffering head supporting spring, 24-step buffering part, 25-testing head shell, 26-testing cavity, 27-cutting part, 28-outer sealing block, 29-sealing limiting ring, 30-limit buffer sleeve, 31-limit fixed sleeve, 32-test head inner support spring, 33-outer fixed ring, 34-inner sealing abutting block, 35-test head outer support spring, 36-middle floating ring, 37 bearing hole, 38-floating groove, 39-fastening screw, 40-floating elastic block, 41-floating spring, 42-upper limit ring, 43-lower limit ring, 49-upper limit ring, 50-upper support frame, 51-upper limit edge, 52-lower support frame, 53-lower limit edge, 54-lower press part, 55-upper buffer support spring, 56-upper buffer frame, 57-upper press part, 58-upper bearing edge, 59-lower buffer frame, 60-lower bearing edge, 61-lower limit ring, 62-lower buffer support spring, 63-the first oil hole and 64-the floating ball core.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and with reference to fig. 1 to 7:

the driving structure is used in a static load test device, wherein the test device comprises a test bed, a test bed and a driving mechanism, wherein the driving mechanism comprises:

the test fixture comprises a test fixture 1, wherein the test fixture 1 is arranged on a test bed and is horizontally arranged with the test bed, a rocker arm mounting shaft and a rocker arm touch roller are arranged on the test fixture 1, a through shaft hole is formed in the test fixture 1, and the mounting shaft can be detachably arranged on the shaft hole of the test fixture 1; during the test, the valve adjusting screw, the nut and the roller of the rocker arm need to be installed. Then the rocker arm is fixed on the shaft hole, and the roller of the rocker arm can be abutted against the abutting roller in the experimental process.

The testing mechanism is arranged on the test bed and positioned on one side of the test fixture 1 and comprises a telescopic driving table 2, a rotating table 3 is arranged on the driving end of the telescopic driving table 2, a supporting rod 4 is arranged on the driving end of the rotating table 3, the driving structure of the load test is arranged on one end of the supporting rod, and a balancing weight 5 is arranged at the other end of the supporting rod 4.

The hydraulic pressure adopts the pulse loading mode to carry out loading drive test head and supports on the valve adjusting screw of rocking arm, tests the load of rocking arm from the realization, and because the other end of rocking arm supports with the conflict roller to the rotation of anti-skidding rocking arm. And a pressure sensor which can be abutted against the rocker roller is arranged on the abutting roller, and the pressure sensor is used for measuring numerical values such as real-time load, maximum load and the like of the rocker.

A strain gauge can be attached to the rocker arm and used for measuring the strain voltage of the rocker arm, the load applied to the rocker arm by the hydraulic testing mechanism is driven, the size of the load applied to the rocker arm by the testing head can be changed by the hydraulic device, and the strain voltage of the rocker arm is read by a dynamic strain gauge to obtain the relation between the static loading load of the valve rocker arm and the strain voltage of the rocker arm.

In the embodiment, the test fixture 1 is used for arranging the rocker arm, and the test mechanism is used for carrying out a load test on the rocker arm; the telescopic driving platform 2 can be a pneumatic or hydraulic telescopic cylinder or an electric straight cylinder, and the rotating platform 3 can be an electric rotating platform 3 or a rotary air rod; the cooperation through bracing piece 4 and revolving stage 3 and flexible drive platform 2 can drive accredited testing organization and be close to the rocking arm or keep away from the direction motion of rocking arm and do the rotatory motion of keeping away from or being close to test fixture 1 in the vertical direction to can be convenient for test and the dismantlement of rocking arm, thereby ensured the good practicality of device, and can be convenient for holistic maintenance and maintenance.

Example one

A driving structure for a load test comprises a hydraulic testing mechanism and a testing head arranged at the end part of the hydraulic testing mechanism;

the hydraulic pressure accredited testing organization includes:

the mounting cylinder body 6 is arranged on the lower side of the support rod 4, a sealing cover is in threaded connection with one side, connected with the support rod 4, of the mounting cylinder body 6, the mounting cylinder body 6 is fixedly connected with the support rod 4 through the sealing cover, and a first oil hole 63 is formed in the side wall, close to the sealing cover, of the mounting cylinder body 6;

the driving piston 7 is arranged in the mounting cylinder 6, a protruding chamber with variable volume is formed between the driving piston 7 and the mounting cylinder 6, and the first oil hole 63 is communicated with the protruding chamber; a testing rod 8 extending out of the cylinder 6 is formed at one end of the driving piston 7 far away from the supporting rod 4, and the driving piston 7 is connected with the testing rod 8 through threads; the driving piston 7 comprises a plurality of piston ring sets, a reset chamber is arranged between the piston ring sets, a bearing ring 9 which is abutted against the side wall of the driving piston 7 and separates the reset chamber is formed on the inner wall of the mounting cylinder 6, a bearing chamber 10 with variable capacity is formed between the reset chamber and the bearing ring 9, a second oil hole 11 communicated with the bearing chamber 10 is formed on the side wall of the mounting cylinder 6, and the volume between the reset chamber and the bearing ring 9 is changed in the process of driving the piston 7 to move; wherein the receiving chamber 10 becomes smaller in volume during the extension of the test rod 8 and larger in volume during the retraction of the test rod 8; the protruding chamber becomes larger in volume during the extension of the test rod 8 and smaller in volume during the retraction of the test rod 8.

The piston ring group is provided with a sealing groove, and the sealing groove is provided with the sealing ring 12;

the driving piston 7 is provided with a buffering mounting hole 13, the buffering mounting hole 13 is fixedly provided with a piston buffering head, a plurality of piston contact blocks 14 which are uniformly distributed are arranged on the end face of the piston buffering head and positioned on the outer edge of the buffering mounting hole 13, and one side of the piston buffering head is abutted against the piston contact blocks 14;

the buffer receiving piece is arranged between the outer wall of the driving piston 7 and the testing rod 8.

In this embodiment, the first oil hole 63 is filled with oil to the extending chamber, so that the high-pressure oil pushes the driving piston 7 to move, the volume of the extending chamber becomes large, the testing rod 8 is driven to extend, and at this time, the volume of the receiving chamber 10 becomes small, and the hydraulic oil in the receiving chamber 10 is discharged through the second oil hole 11; and have the oilhole to accept room 10 through past second and carry out the oiling for high-pressure fluid promotes drive piston 7 to settling the motion of barrel 6 bottom, makes and accepts room 10 volume grow, and drives test bar 8 and stretch out, and the volume that stretches out the cavity this moment diminishes, and will stretch out the hydraulic oil in the cavity and discharge through first oilhole 63, thereby has accomplished the action of stretching out and retracting of test bar 8, and then realizes carrying out pulse loading and exerting pressure to the rocking arm, thereby realizes load test's purpose.

Example two

Besides the technical solutions of the foregoing embodiments, the following technical features are also provided.

The piston cushion head includes:

the buffer fixing bolt 15 comprises a bolt head and a bolt handle which are fixedly connected, the bolt handle is in threaded connection with the buffer mounting hole 13, a flow cavity 16 which is coaxially arranged is arranged in the bolt handle, a plurality of first pressure relief holes 17 communicated with the flow cavity 16 are formed in the outer wall of the bolt handle close to one side of the buffer mounting hole 13, the first pressure relief holes 17 are communicated with gaps between adjacent piston abutting blocks 14, and a plurality of groups of second pressure relief holes 18 communicated with the flow cavity 16 are formed in the outer wall of the bolt handle close to one side of the bolt head;

a stepped hole is formed on the inner side of the buffer head shell 19, one end of the stepped hole is open, the other end of the stepped hole is closed, the diameter of the section of the end, close to the opening of the stepped hole, of the outer wall of the buffer head shell 19 is larger than that of the section of the end, close to the closing end, of the outer wall of the buffer head shell 19, and the outer wall of the side, with the larger diameter, of the outer wall of the buffer head shell 19 is connected with the inner wall of the accommodating barrel body 6 in a sliding mode; one end of the buffer head shell 19 closed by the stepped hole is sleeved on the bolt handle and is in sliding connection with the bolt handle, and the end surface of the buffer head shell is abutted against the end part of the piston abutting block 14; a plurality of axially extending first flow grooves 20 are arranged on the outer wall of one side of the buffer head shell 19 with the large diameter;

the buffer inner core 21 is arranged on the bolt handle, is in sliding connection with the bolt handle and is limited by the bolt head, the buffer inner core 21 is positioned on the opening side of the stepped hole on the buffer head shell 19, the outer wall of the buffer inner core 21 is in sliding connection with the stepped hole of the buffer head shell 19, and a plurality of second flow grooves 22 extending along the axial direction are arranged on the outer wall of the buffer inner core 21;

the buffer head supporting spring 23 is arranged in the stepped hole of the buffer head shell 19, and two ends of the buffer head supporting spring 23 respectively abut against the closed section of the stepped hole and the buffer inner core 21. The first flow channel and the second flow channel 22 are shallow grooves, and the second flow channel 22, the first pressure relief hole 17, the flow cavity 16, the second pressure relief hole 18 and the first flow channel 20 are communicated in sequence, and oil can flow in a circulating manner.

In the embodiment, when the buffer piston drives the test rod 8 to extend out and abut against the rocker arm, impact is generated at the moment, so that an acting force for pressing the test rod 8 into the accommodating cylinder 6 is generated on the rocker arm, and vibration is generated at the same time, at the moment, hydraulic oil forms a reaction force abutting against the buffer piston at the bottom of the buffer piston, and the buffer inner core 21 is arranged, so that the reaction force of the hydraulic oil is not applied to the buffer piston, and because the buffer inner core 21 generates axial floating in the buffer head shell 19 under the action-proof force of the hydraulic oil and the support of the buffer head support spring 23, the reaction force of the hydraulic oil is synthesized through the floating of the buffer inner core 21, the shaking probability of the buffer piston and the test rod 8 is reduced, and a good buffer and shock-absorbing effect is achieved at the bottom of the buffer piston; meanwhile, in the floating process of the buffering inner core 21, hydraulic oil can flow in the first flow groove 20, the second flow groove 22, the flow cavity 16, the first pressure relief hole 17 and the second pressure relief hole 18, so that the buffering inner core 21 is ensured to move and the situation that the oil pressure in the protruding cavity is unstable is avoided.

EXAMPLE III

Besides the technical solutions of the foregoing embodiments, the following technical features are also provided. The testing rod 8 is in a stepped shaft shape with a large upper part and a small lower part, the testing head is arranged on one section of end part with a small diameter of the testing rod 8, the other section of end part with a small diameter of the side-looking rod is provided with a stepped buffering part 24, the stepped buffering part 24 is composed of a first stepped part, a second stepped part and a third stepped part which are gradually reduced in diameter and sequentially connected, and the diameter of the section of the first stepped part is larger than that of the section of the testing rod 8;

the test head includes:

a test head shell 25, wherein a cylindrical test cavity 26 is formed on the test head shell 25, one end of the test cavity 26 is provided with an opening, the test head shell 25 is coaxially sleeved at the end part of the test rod 8 through the opening, the stepped buffer part 24 is positioned in the test cavity 26, and the first stepped part is in sliding fit with the test cavity 26; a cut-in part 27 which is circular in cross section and larger than the test cavity 26 in diameter is arranged on the inner wall of the test cavity 26, the cut-in part 27 extends from the opening hole to the bottom of the test cavity 26 and is at a certain distance from the diameter of the bottom of the test cavity 26;

the outer sealing block 28 is characterized in that a sealing fixing groove is inwards formed in the opening of the test cavity 26, the outer sealing block 28 for blocking the opening is arranged on the sealing fixing groove, a stopping ratchet part is formed on the outer wall of the outer sealing block 28, and the outer sealing block 28 is clamped on the sealing fixing groove through the stopping ratchet part;

a sealing limit ring 29, wherein an annular sealing limit groove is arranged in the testing cavity 26 and at the position of the cut-in part 27 close to the bottom of the testing cavity 26, and the sealing limit ring 29 is arranged on the sealing limit groove; the sealing limit ring 29 is sleeved on the test rod 8 and is connected with the test rod 8 in a sliding manner, and limits the stepped buffering part 24 in the test cavity 26 positioned at the inner side of the sealing limit groove;

the limiting buffer sleeve 30 is arranged on the cut-in part 27 on the inner side of the sealing limiting groove, the outer wall of the limiting buffer sleeve 30 is in a step shape, the diameter of the outer wall close to the bottom of the test cavity 26 is small, the limiting buffer sleeve 30 is in sliding fit with the cut-in part 27 through the outer wall on one side with the large diameter, and the end face on one side with the large diameter of the outer wall of the limiting buffer sleeve 30 is abutted to the end face of the first step part;

a limit fixed sleeve 31, the limit fixed sleeve 31 is connected with the third step part by screw thread, the limit fixed sleeve 31 is propped against the end surface of the second step part, a sleeve supporting edge is formed on the limit fixed sleeve 31 towards the bottom of the test cavity 26,

the test head inner supporting spring 32 is provided with a convex buffering positioning edge at the bottom of the test cavity 26, the test head inner supporting spring 32 is arranged in the test cavity 26 at the inner side of the limiting fixing sleeve 31, two ends of the test head inner supporting spring respectively abut against the bottom of the test cavity 26 and the limiting fixing sleeve 31, and the test head inner supporting spring is limited by the buffering positioning edge and the sleeve supporting edge. The test chamber 26 is filled with a buffer solution on the inner side of the seal retainer ring 29.

In this embodiment, the instant that the buffer piston drives the test rod 8 to extend out and abut against the rocker arm can generate impact, and the end of the test rod 8 can vibrate, and the arranged test head can play a good role in damping and buffering at the end of the test rod 8; at the moment that the test rod 8 is abutted to the rocker arm, the step buffer part 24 can move towards the bottom of the test cavity 26, and buffer liquid is filled, so that a good buffer effect is achieved when the step buffer part 24 moves, and the test head floats relative to the end part of the test rod 8 under the action of the supporting spring 32 in the test head, so that impact force is integrated, and vibration is reduced; and first step portion makes first step portion and cut-in 27 between the clearance has been formed with test chamber 26 sliding fit, thereby make the buffer solution flow to the position between first step portion and the sealed spacing ring 29, and the sealed spacing ring 29 that sets up can prevent the buffer solution outflow, spacing cushion sleeve 30 is through one side outer wall that the diameter is big and cut-in 27 sliding fit, thereby can carry on spacingly to the floating of spacing cushion sleeve 30, and then can restrict the displacement scope of step buffering portion 24, thereby can better must guarantee the effect of test head shock attenuation buffering.

Example four

The test head further includes:

the outer fixing ring 33 is sleeved on the test rod 8, the outer fixing ring 33 is in threaded connection with the outer side of the opening of the test cavity 26 on the test head shell 25 and abuts against the end face of the test head shell 25, and the outer sealing block 28 is limited in the test head shell 25;

the inner sealing abutting block 34 is arranged in the test cavity 26 and abuts against the sealing limiting ring 29, a plurality of sealing ribs which are arranged at equal intervals and have arc-shaped cross sections are formed on the outer side of the inner sealing abutting block 34, the sealing ribs abut against the cut-in portion 27, a concave sealing bearing groove is formed in the end face, close to the sealing limiting ring 29, of one side of the inner sealing abutting block 34, and the bottom of the sealing bearing groove is arc-shaped;

the outer support spring 35 of the test head, the outer support spring 35 of the test head is set up and set up on the test bar 8, and both ends are supported against block 34 and external seal block 28 with the inner seal respectively, and there are sealed fixed edges that are symmetrical each other on block 34 and external seal block 28 in the inner seal respectively, both ends of the outer support spring 35 of the test head block the block 34 and external seal block 28 of sealed fixed edge of blocking up separately. Wherein the outer sealing block 28 and the inner sealing resisting block 34 are made of sealing rubber, and the sealing limiting ring 29 and the fixing ring are made of metal materials.

In this embodiment, the inner sealing abutting block 34 can abut against the sealing limiting ring 29 and perform a good sealing function outside the sealing limiting ring 29, and the outer supporting spring 35 of the test head can perform a good elastic supporting effect on the inner sealing abutting block 34 and can perform an effect of preventing the outer sealing block 28 from falling off through the outer fixing ring 33.

EXAMPLE six

Besides the technical solutions of the foregoing embodiments, the following technical features are also provided. The buffering receiving piece includes:

a middle bearing piece which is sleeved at the middle part of a section with a large diameter of the test rod 8 and floats up and down on the test rod 8,

an upper buffer support, the upper end of which is arranged on the outer wall of the driving piston 7, the other end is arranged on a testing rod 8 above the middle bearing piece,

the upper end of the lower buffer support piece is arranged on the part of the testing rod 8 with a large diameter below the middle bearing piece, and the other end of the lower buffer support piece is arranged at the joint of the section with the large diameter and the section with the small diameter of the testing rod 8;

wherein the intermediate socket member includes:

the middle floating ring 36 is sleeved on the testing rod 8, is in sliding fit with the testing rod 8, and is provided with a plurality of bearing holes 37 which are uniformly distributed according to the circumference and penetrate through the testing rod 8 in the radial direction in the middle of the testing rod 8; one end of the bearing hole 37 close to the test rod 8 is arc-shaped, and one end far away from the test rod 8 is provided with connecting threads inwards;

the bottom of each bearing hole 37 is provided with a floating ball core 64 which can freely roll, the outer wall of the test rod 8 is provided with two arc-shaped floating grooves 38, and the part of the floating ball core 64 extends out of the bearing hole 37 and is matched with the floating grooves 38 in a rolling way;

a fastening screw 39 which is screwed to the receiving hole 37 and prevents the floating ball core 64 from falling out,

a floating elastic block 40, a floating elastic block 40 which is propped against the floating ball core 64 is arranged in the bearing hole 37, the floating elastic block 40 is matched with the bearing hole 37 in a sliding way,

the floating spring 41 is provided in the receiving hole 37, and both ends of the floating spring 41 are respectively abutted against the floating elastic block 40 and the fastening screw 39.

In the embodiment, the middle bearing piece is arranged and matched with the upper buffer support piece and the lower buffer support piece, so that a good buffer effect is achieved between the test rod 8 and the mounting cylinder 6 at the moment that the test rod 8 abuts against the rocker arm, and a good buffer and shock absorption effect of the test mechanism is better ensured; the middle floating ring 36 is positioned by arranging the floating ball core 64 and the floating spring 41, when two sides of the middle floating ring 36 are stressed, the floating ball core 64 is pressed into the middle floating ring 36 under the support of the floating spring 41, and then moves in the direction of the force under the action of the upper buffer support piece or the lower buffer support piece, and because the outer wall of the test rod 8 is provided with two arc-shaped floating grooves 38, the floating or moving positions of the middle floating ring 36 and the floating ball core 64 are limited, so that good positioning and limiting effects are achieved on the middle floating ring 36, and the situation that the buffering effect is poor due to the fact that the displacement of the middle floating ring 36 is too large is avoided; meanwhile, the engagement degree between the fastening screw 39 and the connecting thread of the bearing hole 37 can be adjusted, so that the pretightening force of the floating spring 41 can be adjusted, and a good positioning effect is ensured. The floating elastic block 40 is arranged to have a good bearing effect on the floating spring 41, and the floating elastic block 40 is made of a rubber material.

EXAMPLE six

The intermediate adapter further comprises:

an upper limit ring 42, wherein the upper limit ring 42 is connected with the testing rod 8 positioned at the upper side of the middle floating ring 36 through screw threads;

a lower limit ring 43, wherein the lower limit ring 43 is connected with the testing rod 8 positioned at the lower side of the middle floating ring 36 through screw threads;

wherein the state motion of the intermediate floating ring 36 during operation of the test rod 8 comprises:

moves towards the lower limit ring 43 under the action of the upper buffer support and is propped against the lower limit ring 43,

moves towards the upper limit ring 42 under the action of the lower buffer support and is abutted against the upper limit ring 42.

In the present embodiment, the upper limit ring 42 and the lower limit ring 43 can further limit the position of the intermediate floating ring 36, so as to avoid the intermediate floating ring 36 from greatly deviating; the middle floating ring 36 moves towards the lower limiting ring 43 and abuts against the lower limiting ring 43 under the action of the upper buffering support piece, and moves towards the upper limiting ring 42 and abuts against the upper limiting ring 42 under the action of the lower buffering support piece, so that the good floating effect of the middle floating ring 36 is ensured through the matching of the lower buffering support piece and the upper buffering support piece; when the testing rod 8 extends to abut against the rocker arm, a reaction force for retracting the testing rod 8 is generated at the moment, and a part of the reaction force is integrated under the common buffer action of the upper buffer support piece and the lower buffer support piece, so that the buffer effect of the hydraulic testing mechanism and the testing mechanism is further ensured.

EXAMPLE seven

The upper cushion support includes:

an upper positioning ring 49, wherein the upper positioning ring 49 is fixed on the outer wall of the driving piston 7 through threads;

the upper support frame 50 is sleeved on the outer wall of the driving piston 7, the upper support frame 50 is in sliding fit with the outer wall of the driving piston 7, and an upper limiting edge 51 extends downwards from the lower side of the upper support frame 50;

the lower support frame 52 is sleeved on the test rod 8, is close to one side of the upper limiting ring 42, is in sliding fit with the outer wall of the test rod 8, is provided with a lower limiting edge 53 extending upwards on the upper side of the lower support frame 52, and is provided with a lower pressing part 54 extending downwards and abutting against the middle floating ring 36 on the lower side of the lower support frame 52;

an upper buffering support spring 55 is sleeved outside the driving piston 7 and positioned between the upper support frame 50 and the lower support frame 52, two ends of the upper buffering support spring 55 are respectively abutted against the upper limiting edge 51 and the lower limiting edge 53, and the upper buffering support spring 55 is in a compressed state when the testing rod 8 retracts; and the upper support bracket 50 is urged against the underside of the upper locating ring 49 by the upper cushion support ring, urging the lower press portion 54 of the lower support bracket 52 against the intermediate floating ring 36.

In this embodiment, the upper positioning ring 49 is used for limiting the upper support frame 50 from moving upwards, and under the action of the upper buffering support spring 55, the lower support frame 52 is displaced towards the direction away from the upper support frame 50, and because the upper buffering support spring 55 is in a compressed state when the test rod 8 retracts, the lower support frame 52 is always abutted to the middle floating ring 36 when the test rod 8 extends, so that the middle floating ring 36 is located on the side close to the lower positioning ring 43, and when the middle floating ring 36 floats upwards, the lower support frame 52 and the upper buffering support spring 55 can play a good role in buffering and damping, so that good floatability of the middle floating ring 36 is ensured.

Example eight

Besides the technical solutions of the foregoing embodiments, the following technical features are also provided. The lower cushion support includes:

an upper buffer frame 56, wherein the upper buffer frame 56 is sleeved outside the test rod 8 and positioned at the lower side of the lower limit ring 43, the upper buffer frame 56 is connected with the test rod 8 in a sliding manner, an upper abutting part 57 abutting against the lower side of the middle floating ring 36 is formed on the upper side of the upper buffer frame 56, and an upper receiving edge 58 extending downwards is formed on the lower side of the upper buffer frame 56;

the lower buffer frame 59 is arranged at the joint of the section with the large diameter and the section with the small diameter of the test rod 8, the lower buffer frame 59 is abutted against the end face of the section with the large diameter of the test rod 8, and a lower bearing edge 60 is upwards formed on the upper side of the lower buffer frame 59;

the lower positioning ring 61 is connected with the lower positioning ring 61 for limiting the lower buffer frame 59 on the section with the small diameter of the test rod 8 in a threaded manner;

and a lower buffer support spring 62, wherein the lower buffer support spring 62 positioned between the upper buffer frame 56 and the lower buffer frame 59 is sleeved on the test rod 8, two ends of the lower buffer support spring 62 respectively abut against the upper limit edge 51 and the lower limit edge 53, and the upper abutting part 57 for buffering the lower part abuts against the middle floating ring 36 through the lower buffer spring. The lower cushion support spring 62 is in a relaxed state at normal times, and the acting force of the lower cushion support spring 62 against the middle floating ring 36 is slightly larger than the acting force of the upper cushion support spring 55 against the middle floating ring 36 when the test rod 8 is fully extended, but the floating ball core 64 cannot be pressed into the middle floating ring 36.

In this embodiment, the lower positioning ring 61 is engaged with the end surface of the section of the test rod 8 having a larger diameter to fix the lower buffer frame 59, since the upper buffer and upper buffer frame 56 are slidably connected to the testing rod 8, and the upper buffer frame 56 abuts against the middle floating ring 36, at the moment that the test rod 8 is abutted against the rocker arm, the upper buffer frame 56 tends to move along with the test rod 8 towards the mounting cylinder 6, so that the lower buffer spring between the upper buffer frame 56 and the lower buffer frame 59 is compressed, and applies a force to the intermediate floating ring 36, and since the other end of the intermediate floating ring 36 is abutted by the upper cushion support spring 55, so that the moment of impact force causes the lower cushion support spring 62 to compress and drive the upper cushion against the intermediate floating ring 36, thereby floating the intermediate floating ring 36, and further offsetting a part of the impact force and achieving a certain buffering and damping effect.

The first oil hole 63 and the second oil hole 11 are respectively provided with an electromagnetic valve, a control cabinet, a hydraulic driving device and an oil tank are arranged outside the electromagnetic valves, a controller and a control circuit are arranged in the control cabinet, the action of the experimental device is controlled by the controller in a programming mode, the hydraulic testing mechanism is positioned on one side far away from the test fixture 1 under the condition of no test, and the telescopic driving table 2 is in an extending state; the hydraulic driving device is a pump which adopts a pulse loading mode to load or other existing hydraulic structures, a pressure regulating valve and other structures for regulating oil pressure are arranged on a pipeline for conveying hydraulic oil, and the pressure regulating valve and the like can be programmed and controlled by a controller. The solenoid valve is two-position three-way solenoid valve to can realize carrying oil or arranging oil through an oilhole.

The experimental method of the experimental device suitable for the device in the embodiment comprises the following steps:

step two: the rotation of the rotating platform 3 is controlled by the controller, so as to drive the hydraulic testing mechanism on the supporting rod 4 to rotate in the reverse direction of the test fixture 1,

step three, the controller drives the telescopic driving platform 2 to retract so that the hydraulic testing mechanism is abutted to the valve end of the rocker arm,

While the embodiments of the present application have been described in connection with the drawings, the embodiments and features of the embodiments of the present application can be combined with each other without conflict, and the present application is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present application and the claims.

Claims

1. A driving structure for a load test is characterized by comprising a hydraulic testing mechanism, wherein a testing head is arranged at the end part of the hydraulic testing mechanism;

the hydraulic pressure test mechanism include:

the mounting cylinder body (6) is arranged on the lower side of the supporting rod (4), a sealing cover is in threaded connection with one side, connected with the supporting rod (4), of the mounting cylinder body (6), the mounting cylinder body (6) is fixedly connected with the supporting rod (4) through the sealing cover, and a first oil hole (63) is formed in the side wall, close to the sealing cover, of the mounting cylinder body (6);

the driving piston (7) is arranged in the arrangement cylinder body (6), and a testing rod (8) extending out of the arrangement cylinder body (6) is formed at one end, far away from the supporting rod (4), of the driving piston (7); the driving piston (7) comprises a plurality of piston ring sets, a reset chamber is arranged between the piston ring sets, a bearing ring (9) which is abutted against the side wall of the driving piston (7) and separates the reset chamber is formed on the inner wall of the mounting cylinder body (6), a bearing chamber (10) with variable capacity is formed between the reset chamber and the bearing ring (9), and a second oil hole (11) communicated with the bearing chamber (10) is formed on the side wall of the mounting cylinder body (6);

the piston ring group is provided with a sealing groove, and the sealing groove is provided with the sealing ring (12);

the driving piston (7) is provided with a buffering mounting hole (13), the buffering mounting hole (13) is fixedly provided with the piston buffering head, a plurality of piston contact blocks (14) which are uniformly distributed are arranged on the end surface of the piston buffering head and positioned on the outer edge of the buffering mounting hole (13), and one side of the piston buffering head is abutted against the piston contact blocks (14);

the buffer bearing piece is arranged between the outer wall of the driving piston (7) and the testing rod (8).

2. The driving structure for the load test as set forth in claim 1, wherein said piston cushion head comprises:

the buffer fixing bolt (15) comprises a bolt head and a bolt handle which are fixedly connected, the bolt handle is in threaded connection with the buffer mounting hole (13), a flow cavity (16) which is coaxially arranged is arranged in the bolt handle, a plurality of first pressure relief holes (17) communicated with the flow cavity (16) are formed in the outer wall of one side, close to the buffer mounting hole (13), of the bolt handle, the first pressure relief holes (17) are communicated with gaps between adjacent piston abutting blocks (14), and a plurality of groups of second pressure relief holes (18) communicated with the flow cavity (16) are formed in the outer wall of one side, close to the bolt head, of the bolt handle;

the buffer head comprises a buffer head shell (19), wherein a stepped hole is formed in the inner side of the buffer head shell (19), one end of the stepped hole is open, the other end of the stepped hole is closed, the diameter of the section of the outer wall of the buffer head shell (19) close to the open end of the stepped hole is larger than that of the section close to the closed end, and the outer wall of the larger side of the outer wall of the buffer head shell (19) is in sliding connection with the inner wall of the accommodating barrel body (6); one end of the buffer head shell (19) closed by the stepped hole is sleeved on the bolt handle and is in sliding connection with the bolt handle, and the end surface of the buffer head shell is abutted against the end part of the piston abutting block (14); a plurality of axially extending first flow grooves (20) are arranged on the outer wall of one side of the buffer head shell (19) with the large diameter;

the buffer head comprises a buffer inner core (21), wherein the buffer inner core (21) which is connected with the bolt handle in a sliding mode and limited through a bolt head is arranged on the bolt handle, the buffer inner core (21) is positioned on the opening side of a stepped hole in a buffer head shell (19), the outer wall of the buffer inner core (21) is connected with the stepped hole in the buffer head shell (19) in a sliding mode, and a plurality of second flow grooves (22) extending along the axial direction are formed in the outer wall of the buffer inner core (21);

the buffer head supporting spring (23) is arranged in a stepped hole of the buffer head shell (19), and two ends of the buffer head supporting spring (23) are respectively abutted against the closed section of the stepped hole and the buffer inner core (21).

3. The driving structure for the load test according to claim 2, wherein the test rod (8) is in a stepped shaft shape with a large top and a small bottom, the test head is arranged on a section with a small diameter of the test rod (8), a stepped buffer part (24) is arranged at the end part of the section with the small diameter of the side view rod, the stepped buffer part (24) is composed of a first step part, a second step part and a third step part which are gradually reduced in diameter and are sequentially connected, and the diameter of the section of the first step part is larger than that of the section of the test rod (8);

the test head includes:

the test head comprises a test head shell (25), wherein a cylindrical test cavity (26) is formed in the test head shell (25), one end of the test cavity (26) is provided with an opening, the test head shell (25) is coaxially sleeved at the end part of a test rod (8) through the opening, a stepped buffer part (24) is positioned in the test cavity (26), and a first stepped part is in sliding fit with the test cavity (26); a cut-in part (27) which is circular in cross section and larger than the test cavity (26) in diameter is arranged on the inner wall of the test cavity (26), and the cut-in part (27) extends from the opening hole to the bottom of the test cavity (26) and forms a certain distance with the diameter of the bottom of the test cavity;

the outer sealing block (28), set up the sealed fixed slot inwards in the trompil of the said test chamber (26), there are outer sealing blocks (28) to stop up the trompil on the sealed fixed slot, the outer wall of the outer sealing block (28) forms the ratchet portion of stopping back, the outer sealing block (28) is blocked on the sealed fixed slot through the ratchet portion of stopping back;

the sealing limiting ring (29) is arranged in the testing cavity (26) and is positioned at the position, close to the bottom of the testing cavity, of the cut-in part (27), and an annular sealing limiting groove is formed in the sealing limiting groove, and the sealing limiting ring (29) is arranged on the sealing limiting groove; the sealing limiting ring (29) is sleeved on the test rod (8) and is in sliding connection with the test rod (8), and the stepped buffering part (24) is limited in the test cavity positioned at the inner side of the sealing limiting groove;

the limiting buffer sleeve (30) is arranged on the cut-in part (27) on the inner side of the sealing limiting groove, the outer wall of the limiting buffer sleeve (30) is in a step shape, the diameter of the outer wall close to the bottom of the test cavity (26) is small, the limiting buffer sleeve (30) is in sliding fit with the cut-in part (27) through the outer wall on one side with the large diameter, and the end face on one side with the large diameter of the outer wall of the limiting buffer sleeve (30) is abutted to the end face of the first step part;

a limiting fixed sleeve (31), the third step part is in threaded connection with the limiting fixed sleeve (31), the limiting fixed sleeve (31) is abutted against the end face of the second step part, a sleeve supporting edge is formed on the limiting fixed sleeve (31) in the direction towards the bottom of the test cavity (26),

the test head inner support spring (32) is arranged in the test cavity (26) on the inner side of the limiting fixed sleeve (31), two ends of the test head inner support spring (32) respectively abut against the bottom of the test cavity (26) and the limiting fixed sleeve (31), and the test head inner support spring is limited by the buffering positioning edge and the sleeve supporting edge.

4. A drive arrangement for a load test as set forth in claim 3 wherein said test head further includes:

the outer fixing ring (33) is sleeved on the testing rod (8), the outer fixing ring (33) is in threaded connection with the outer side of an opening of the testing cavity (26) on the testing head shell (25) and abuts against the end face of the testing head shell (25), and the outer sealing block (28) is limited in the testing head shell (25);

the testing cavity (26) is provided with an inner sealing abutting block (34) abutting against the sealing limiting ring (29), a plurality of sealing ribs which are arranged at equal intervals and have arc-shaped cross sections are formed on the outer side of the inner sealing abutting block, the sealing ribs abut against the cut-in part (27), an inward concave sealing bearing groove is formed on the end face of one side, close to the sealing limiting ring (29), of the inner sealing abutting block, and the bottom of the sealing bearing groove is arc-shaped;

the test head outer support spring (35), test head outer support spring (35) set up the cover and establish on test bar (8), and both ends respectively support with interior sealed support block (34) and outer sealing block (28) and offset to be provided with respectively on interior sealed support block (34) and outer sealing block (28) and be the sealed fixed edge that is mutual symmetry, the sealed fixed edge of interior sealed support block (34) and outer sealing block (28) is blocked respectively at the both ends of test head outer support spring (35) is along last.

5. The drive configuration for the load test as set forth in claim 4, wherein said cushion receiver comprises:

the middle bearing piece is sleeved at the middle part of the section with the large diameter of the test rod (8) and floats up and down on the test rod (8),

an upper buffer support, the upper end of the upper buffer support is arranged on the outer wall of the driving piston (7), the other end is arranged on a testing rod (8) above the middle bearing piece,

the upper end of the lower buffer support piece is arranged on the part of the testing rod (8) with a large diameter below the middle bearing piece, and the other end of the lower buffer support piece is arranged at the joint of the section with the large diameter and the section with the small diameter of the testing rod (8);

wherein said intermediate adapter comprises:

the middle floating ring (36) is sleeved on the testing rod (8), is in sliding fit with the testing rod (8), and is provided with a plurality of bearing holes (37) which are uniformly distributed according to the circumference and radially penetrate through the middle part of the testing rod (8); one end of the bearing hole (37) close to the test rod (8) is arc-shaped, and one end far away from the test rod (8) is internally provided with a connecting thread;

the bottom of each bearing hole (37) is provided with a floating ball core (64) capable of freely rolling, the outer wall of the test rod (8) is provided with two arc-shaped floating grooves (38), and the part of the floating ball core (64) extends out of the bearing hole (37) and is matched with the floating grooves (38) in a rolling manner;

a fastening screw (39) which is connected with the bearing hole (37) in a threaded manner and prevents the floating ball core (64) from falling out,

a floating elastic block (40), wherein the floating elastic block (40) which is propped against the floating ball core (64) is arranged in the bearing hole (37), the floating elastic block (40) is in sliding fit with the bearing hole (37),

and a floating spring (41), wherein the floating spring (41) is arranged in the bearing hole (37), and two ends of the floating spring (41) are respectively abutted against the floating elastic block (40) and the fastening screw (39).

6. The drive configuration for a load test as set forth in claim 5, wherein said intermediate adapter further comprises:

an upper limit ring (42), wherein the upper limit ring (42) is connected with the testing rod (8) positioned on the upper side of the middle floating ring (36) in a threaded manner;

a lower limit ring (43), wherein the lower limit ring (43) is connected with the testing rod (8) which is positioned at the lower side of the middle floating ring (36) in a threaded manner;

wherein the state movement of the intermediate floating ring (36) during the operation of the test rod (8) comprises:

moves towards the direction of the lower limit ring (43) under the action of the upper buffer support piece and is propped against the lower limit ring (43),

moves towards the upper limit ring (42) under the action of the lower buffer support piece and is propped against the upper limit ring (42).

7. The driving structure for the load test as set forth in claim 6, wherein said upper buffering support member comprises:

the upper positioning ring (49), the said upper positioning ring (49) is fixed on the outer wall of the driving piston (7) through the whorl;

the upper support frame (50) is sleeved on the outer wall of the driving piston (7), the upper support frame (50) is in sliding fit with the outer wall of the driving piston (7), and an upper limiting edge (51) extends downwards from the lower side of the upper support frame (50);

the lower support frame (52) is sleeved on the test rod (8), is close to one side of the upper limiting ring (42) and is in sliding fit with the outer wall of the test rod (8), a lower limiting edge (53) extending upwards is formed on the upper side of the lower support frame (52), and a pressing part (54) extending downwards and abutting against the middle floating ring (36) is arranged on the lower side of the lower support frame (52);

the upper buffering support spring (55) is sleeved outside the driving piston (7) and positioned between the upper support frame (50) and the lower support frame (52), two ends of the upper buffering support spring (55) respectively abut against the upper limiting edge (51) and the lower limiting edge (53), and the upper buffering support spring (55) is in a compressed state when the testing rod (8) retracts; and the upper support frame (50) is abutted against the lower side of the upper positioning ring (49) through the upper buffer support ring, and the lower pressing part (54) of the lower support frame (52) is abutted against the middle floating ring (36).

8. The driving structure for the load test as set forth in claim 7, wherein said lower buffering support member comprises:

the upper buffer frame (56) is sleeved outside the test rod (8) and positioned on the lower side of the lower limiting ring (43), the upper buffer frame (56) is in sliding connection with the test rod (8), an upper abutting part (57) abutting against the lower side of the middle floating ring (36) is formed on the upper side of the upper buffer frame (56), and an upper receiving edge (58) extending downwards is formed on the lower side of the upper buffer frame (56);

the lower buffer frame (59) is arranged at the joint of the section with the large diameter and the section with the small diameter of the test rod (8), the lower buffer frame (59) is abutted against the end face of the section with the large diameter of the test rod (8), and a lower bearing edge (60) is formed on the upper side of the lower buffer frame (59) in the upward direction;

the lower positioning ring (61) is connected with the lower positioning ring (61) for limiting the lower buffer frame (59) in a threaded manner on the section with the small diameter of the test rod (8);

lower buffering supporting spring (62), the cover is equipped with on test bar (8) and is located buffering frame (56) and lower buffering frame (59) between buffering supporting spring (62) down, and the both ends of buffering supporting spring (62) down support respectively on last spacing edge (51) and lower spacing edge (53), and support to middle floating ring (36) through lower buffer spring with lower buffering last conflict portion (57) that adds.