CN214503665U

CN214503665U - Valve rotating speed detection device

Info

Publication number: CN214503665U
Application number: CN202120571332.0U
Authority: CN
Inventors: 王红剑; 李海民; 覃国林
Original assignee: HUNAN LIYU GAS POWER CO Ltd
Current assignee: HUNAN LIYU GAS POWER CO Ltd
Priority date: 2021-03-19
Filing date: 2021-03-19
Publication date: 2021-10-26
Anticipated expiration: 2031-03-19

Abstract

The utility model provides a valve rotational speed detection device relates to valve detection technical field. The valve rotating speed detection device comprises a pressing component and a detection component; the downward pressing component comprises a driving rod and a downward pressing piece, wherein a rod body of the driving rod is provided with a hinging part and a connecting part which are arranged at intervals, the hinging part is hinged on a fixed foreign object, and the connecting part is positioned on one side of the side surface of the cylinder cover assembly, on which the valve head is exposed; the lower pressing piece is connected with the connecting part and is abutted against the valve head; the driving rod is used for rotating to drive the lower pressing piece to move along the axial direction of the valve in the cylinder cover assembly, and the lower pressing piece is used for driving the valve to move along the axial direction of the valve under the driving of the driving rod; the detection assembly is used for detecting the valve rotating speed. The valve rotating speed detection device can be used by being separated from a motor, is low in energy consumption, simple in structure and lower in cost, can directly detect the valve rotating speed in a cylinder cover assembly, does not need simulation pieces such as a valve spring simulation piece and the like, and reduces detection errors.

Description

Valve rotating speed detection device

Technical Field

The utility model belongs to the technical field of the valve detects technique and specifically relates to a valve rotational speed detection device is related to.

Background

The valve is an important part of the valve actuating mechanism of the engine, as shown in fig. 1, the valve spring 2 and other parts are all arranged on the cylinder cover 3 to jointly form a cylinder cover assembly. The valve 1 comprises a valve head 10, a valve guide 11 and a generally disc-shaped valve seat 12, the valve guide 11 is sleeved in a valve guide 30 on the cylinder head 3, and the valve head 10 extends out of the top of the cylinder head 3. The valve head 10 is provided with a valve spring seat 4, and the valve spring 2 is sleeved outside the valve guide rod 11 and connected between the valve spring seat 4 and the cylinder cover 3.

When the engine runs, the valve guide rod 11 can be lifted in the valve guide 30, so as to drive the valve seat 12 to lift, and the lifted valve seat 12 can be matched with the valve seat ring 31 at the bottom of the cylinder cover 3, so as to seal or open the gas passage of the cylinder. In order to prevent the valve 1 and the valve seat 31 from eccentric wear to cause poor sealing, the valve needs to be rotatable while lifting, and therefore, a valve rotating mechanism 5 (also called a valve rotating device) is sleeved at the position between the valve spring 2 and the cylinder cover 3 outside the valve guide rod 11 to realize the rotation of the valve.

The rotating speed of the valve is influenced by various factors such as the design, the processing precision, the quality and the like of the valve rotating mechanism, and whether the valve rotating mechanism meets the requirements can be determined by detecting the rotating speed of the valve. The measurement process of the valve rotation speed is usually performed by a supplier of the valve rotating mechanism on a special valve rotation speed testing device. The testing device comprises a driving structure, a simulation structure and a detection structure, wherein the driving structure comprises a motor, a gearbox, a camshaft, a push rod and a rocker arm, the simulation structure comprises simulation pieces such as a valve simulation piece, a valve spring simulation piece and a cylinder cover simulation piece, and the detection structure comprises a detector for detecting the rotating speed of a valve, such as a rotating speed sensor. The motor is connected with a gear on the gear box through a conveyor belt, and the cam shaft is arranged in the gear box and connected with the gear. The push rod is vertically arranged on the gearbox, one end of the push rod is connected with the camshaft, the other end of the push rod is hinged with one end of the rocker arm, the middle of the rocker arm is hinged with the top of the gearbox, and the other end of the rocker arm is connected with the valve simulation piece. When testing, earlier will await measuring valve rotary mechanism cup joints on the valve simulation piece to install between valve spring simulation piece and cylinder cap simulation piece, the restart motor, the motor can drive gearbox gear revolve, drives the camshaft rotation then, thereby drives the push rod and goes up and down. The lifting push rod can drive the rocker arm to rotate, and then the valve simulation piece can be driven to lift and rotate, and the lifting and rotating processes of the simulation valve are achieved. During the simulation, the valve speed may be measured using a sensing structure.

However, the conventional valve rotation speed testing device can be used only by supplying power to a motor in a driving structure, the energy consumption is high, the driving structure has the defects of complex structure and high cost, the device is not suitable for downstream merchants needing only stock check, such as engine manufacturers, and the like, and a large number of simulation pieces are arranged in the simulation structure, so that the measurement error is large.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a valve rotational speed detection device to alleviate the valve rotational speed testing arrangement that exists among the prior art and need just can use for the motor power supply in its drive structure, the energy consumption is high, and its drive structure has the shortcoming that the structure is complicated, the expense is high, and be not applicable to the low reaches trade company that engine manufacturer etc. only need advance the inspection, and, the dummy in its analog structure is more, leads to the great technical problem of measuring error.

In a first aspect, the utility model provides a valve rotating speed detection device, which comprises a pressing component and a detection component;

the downward pressing component comprises a driving rod and a downward pressing piece, wherein a rod body of the driving rod is provided with a hinging part and a connecting part which are arranged at intervals, the hinging part of the driving rod is hinged on a fixed foreign object, and the connecting part of the driving rod is positioned on one side of the side surface of the cylinder cover assembly, on which the valve head is exposed;

the pressing piece is connected with the connecting part of the driving rod and is abutted against the valve head; the driving rod is used for rotating by taking the hinged part as a rotating center so as to drive the lower pressing piece to move along the axial direction of the valve in the cylinder cover assembly, and the lower pressing piece is used for driving the valve to move along the axial direction of the valve under the driving of the driving rod;

the detection component is used for detecting the rotating speed of the valve when the valve moves along the axial direction of the valve and rotates under the action of a valve rotating mechanism of the cylinder cover assembly.

In an alternative embodiment, the hinge portion of the driving lever is hinged to the foreign object through a horizontal rotating shaft perpendicular to the axial direction of the valve;

the horizontal rotating shaft and the foreign object are connected with a vertical rotating shaft in a rotating mode, and the vertical rotating shaft is parallel to the axial direction of the air valve and perpendicular to the horizontal rotating shaft.

In an alternative embodiment, one end of the driving rod is the hinge part, and the rod body between the two ends of the driving rod is the connecting part;

the pushing piece is connected to the connecting portion of the driving rod in a sliding mode, and the pushing piece can slide along the length direction of the driving rod.

In an optional embodiment, a limiting member is disposed on the connecting portion of the driving rod, and the limiting member is used to connect with the lower pressing member to limit the sliding of the lower pressing member relative to the driving rod.

In an optional embodiment, the limiting member is a rack disposed along a length direction of the driving rod;

the lower pressing piece is provided with a clamping piece matched with the rack, and the clamping piece can abut against any group of adjacent two teeth of the rack.

In an optional embodiment, a U-shaped clamping groove is formed in the end portion, close to the driving rod, of the lower pressing piece, and two extending portions extending towards the inside of the groove of the clamping groove are respectively arranged on two sides of the notch of the clamping groove;

the clamping piece is in a rod shape, penetrates through the side walls of the two sides of the clamping groove along the direction perpendicular to the groove depth of the clamping groove and is installed on the lower pressing piece;

the driving rod penetrates through the clamping groove and is abutted between the clamping piece and the extension part in the clamping groove; the rack is arranged on one side of the driving rod, which is close to the clamping piece.

In an alternative embodiment, the cylinder head assembly further comprises a guide plate, wherein the guide plate is positioned between the driving rod and the side of the cylinder head assembly, on which the valve head is exposed, and is fixed on the cylinder head assembly;

the guide plate is provided with a guide hole at a position corresponding to the valve head, and the pressing piece penetrates through the guide hole and then is abutted to the valve head.

In an alternative embodiment, the hold-down member comprises a push rod and a press block;

one end of the push rod is positioned on one side of the guide plate far away from the valve cover, and the other end of the push rod is abutted to the valve head after penetrating through the guide hole of the guide plate;

one end of the pressing block is connected with the connecting portion of the driving rod, and the other end of the pressing block is connected with the end portion, far away from the valve head, of the push rod.

In an alternative embodiment, the end of the push rod far away from the valve head is provided with a limiting head, and the limiting head can be attached to one side, far away from the valve cover, of the guide plate;

and the distance between the side surface of the limiting head close to the push rod and the side surface of the guide plate close to the push rod is equal to the maximum lift of the valve.

In an optional embodiment, the detection assembly comprises an annular protractor, and the inner diameter of the protractor is not less than the outer diameter of a valve seat ring sleeved outside a disc-shaped valve seat of the valve;

the protractor is used for being sleeved outside the valve seat ring and is arranged concentrically with the valve seat ring.

The utility model provides a valve rotational speed detection device is including pushing down subassembly and determine module. The utility model provides a valve rotational speed detection device is arranged in detecting the carminative rotational speed in the cylinder head assembly that assembles, and wherein, the cylinder head assembly is prior art, and its structure and theory of operation have been disclosed in the background art, no longer describe herein. When the valve rotating speed detection device is used for detecting the rotating speed of a valve in a cylinder cover assembly, the hinged part of the driving rod is hinged on a foreign object with a fixed position, a pressing piece connected with the driving rod is abutted on a valve head in the cylinder cover assembly, and then the driving rod is rotated by taking the hinged part as a rotating center. Wherein, the actuating lever can play lever action, can make the actuating lever rotate through the artifical actuating lever that pushes down. After the driving rod rotates, the pushing-down piece can be driven to move along the axial direction of the valve, and then the pushing-down piece can be utilized to drive the valve to move along the axial direction of the valve, and at the moment, the process of lifting the valve can be simulated under the cooperation of a valve spring in the cylinder cover assembly. Because the cylinder cover assembly is also provided with a valve rotating mechanism for realizing the rotation of the valve, the valve can also rotate when lifting. After the valve rotates, the rotation speed of the valve may be detected using a detection module in the valve rotation speed detection apparatus.

Compared with the prior art, the utility model provides a valve rotational speed detection device can drive down-pressure member and valve along spiracular axial displacement through artifical rotation actuating lever, need not use the motor, and then can the energy saving consumed. And, compare the drive structure in current valve rotation speed testing arrangement, the utility model provides a valve rotation speed detection device's push down subassembly structure is simpler, the cost is lower and use more convenient, is applicable to the low reaches trade company that engine manufacturer etc. only need carry out the inspection of stocking. Furthermore, the utility model provides a valve rotational speed detection device can directly be used for detecting the valve rotational speed in the cylinder cap assembly, need not use simulation pieces such as valve spring simulation piece and cylinder cap simulation piece, and the detection error is lower.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a cross-sectional view of a prior art cylinder head assembly;

fig. 2 is a schematic structural diagram of a cylinder head assembly and a valve rotation speed detection device provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a push rod and a limiting plate according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a pressing block provided by an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a cylinder head assembly and a detection assembly provided in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of the detection assembly in fig. 5.

Icon: 1-air valve; 10-a valve head; 11-valve guide rod; 12-valve seat; 2-a valve spring; 3-a cylinder head; 30-a valve guide; 31-valve seat ring; 4-valve spring seats; 5-a valve rotating mechanism; 6-pressing the assembly; 60-a drive rod; 600-a hinge; 601-a connecting part; 6010-a stop; 602-a horizontal rotating shaft; 603-vertical rotating shaft; 61-a hold down; 610-a clip; 611-a push rod; 6110-a limiting head; 612-briquetting; 6120-slot; 6121-card slot; 6122-extension; 7-a guide plate; 70-a guide hole; 71-a support column; 72-a limiting hole; 8-a cylinder head assembly; 80-a limiting column; 9-protractor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The first embodiment is as follows:

as shown in fig. 2 to 6, the valve rotation speed detection apparatus provided in the present embodiment includes a depressing component 6 and a detecting component. The push-down assembly 6 comprises a driving rod 60 and a push-down piece 61, wherein the rod body of the driving rod 60 is provided with a hinge part 600 and a connecting part 601 which are arranged at intervals, the hinge part 600 of the driving rod 60 is hinged on a fixed foreign object, and the connecting part 601 of the driving rod 60 is positioned on one side of the side surface of the cylinder cover assembly 8, on which the valve head 10 is exposed. The push piece 61 is connected to the connecting portion 601 of the drive lever 60, and the push piece 61 abuts on the valve head 10. The driving rod 60 is configured to rotate around the hinge portion 600 to drive the lower pressing member 61 to move along the axial direction of the valve 1 in the cylinder head assembly 8, and the lower pressing member 61 is configured to drive the valve 1 to move along the axial direction of the valve 1 under the driving of the driving rod 60. The detection component is used for detecting the rotating speed of the valve 1 when the valve 1 moves along the axial direction and rotates under the action of the valve rotating mechanism 5 of the cylinder cover assembly 8.

The valve rotation speed detection device provided by the embodiment is used for detecting the rotation speed of the valve 1 in the assembled cylinder head assembly 8, wherein the cylinder head assembly 8 is the prior art. The structure of the cylinder head assembly 8, the structure of the valve 1 in the cylinder head assembly 8, and the assembly relationship of the valve 1 in the cylinder head assembly 8 are shown in fig. 1, and since the specific structure and the working principle of the cylinder head assembly 8 are disclosed in the background art, detailed description is omitted here.

When the valve speed detecting device is used to detect the speed of the valve 1 in the cylinder head assembly 8, the hinge portion 600 of the driving rod 60 is first hinged to a fixed-position foreign object, wherein the foreign object may be any fixed-position object other than the driving rod 60 compared to the driving rod 60, such as the cylinder head 3 in the cylinder head assembly 8 or other objects located on the periphery side of the cylinder head assembly 8. The preferred stationary foreign object of this embodiment is the cylinder head 3 in the cylinder head assembly 8, and the hinge portion 600 of the drive lever 60 is hinged to the side of the cylinder head 3 where the valve head 10 is exposed.

And the push-down piece 61 connected to the drive lever 60 is abutted against the valve head 10 in the cylinder head assembly 8, and the drive lever 60 is rotated with the hinge portion 600 as the rotation center. The driving rod 60 can play a lever role, and the driving rod 60 can be rotated by manually pressing the driving rod 60. After the driving rod 60 rotates, the pressing piece 61 can be driven to move along the axial direction of the valve 1, and then the pressing piece 61 can be utilized to drive the valve 1 to move along the axial direction of the valve 1, and at the moment, the lifting process of the valve 1 can be simulated under the cooperation of the valve spring 2 in the cylinder cover assembly 8. Since the cylinder head assembly 8 is also provided with the valve rotating mechanism 5 for rotating the valve 1, the valve 1 can rotate when lifted. After the valve 1 rotates, the rotation speed of the valve 1 may be detected using a detection unit in the valve rotation speed detection apparatus.

Compared with the prior art, the valve speed detection device provided by the embodiment can drive the pressing piece 61 and the valve 1 to move along the axial direction of the valve 1 by manually rotating the driving rod 60, and a motor is not needed, so that the energy consumption can be saved. In addition, compared with a driving structure in the existing valve 1 rotation speed testing device, the pressing component 6 of the valve rotation speed testing device in the embodiment has the advantages of simpler structure, lower cost and more convenient use, and is suitable for downstream merchants such as engine manufacturers and the like which only need to carry out stock inspection. In addition, the valve speed detection device provided by the embodiment can be directly used for detecting the valve speed in the cylinder head assembly 8, and the simulation pieces such as the valve spring 2 simulation piece and the cylinder head 3 simulation piece are not needed, so that the detection error is lower.

As shown in fig. 2, the hinge portion 600 of the driving lever 60 is hinged to the foreign object by a horizontal rotation shaft 602 perpendicular to the axial direction of the valve 1. A vertical rotating shaft 603 is rotatably connected between the horizontal rotating shaft 602 and the foreign object, and the vertical rotating shaft 603 is parallel to the axial direction of the valve 1 and is perpendicular to the horizontal rotating shaft 602.

The horizontal rotation shaft 602 is used to realize the hinge between the hinge portion 600 of the driving lever 60 and the foreign object, so that the driving lever 60 can be rotated at one side of the cylinder head 3 in a direction approaching or departing from the cylinder head 3.

The vertical rotating shaft 603 enables the driving rod 60 to rotate on the plane of the horizontal shaft, thereby facilitating the position adjustment of the pressing member 61 on the plane of the horizontal shaft and improving the flexibility of the pressing assembly 6. For example, the cylinder head assembly 8 shown in fig. 2 includes four valves 1, and the vertical rotation shaft 603 allows the hold-down member 61 to be sequentially aligned with the valve heads 10 of the four valves 1 when the rotational speed is detected sequentially for the four valves 1.

In order to improve the stability of the driving rod 60, the vertical rotating shaft 603 is preferably a bolt in this embodiment. At this time, the cylinder head 3 may be provided with a threaded hole adapted to the vertical rotating shaft 603, and one end of the vertical rotating shaft 603 is screwed into the threaded hole. The other end of the vertical rotating shaft 603 can be provided with two ear plates which are parallel to each other, and the horizontal rotating shaft 602 is rotatably connected between the two ear plates.

In this embodiment, one end of the driving rod 60 is a hinge 600, and the shaft between the two ends of the driving rod 60 is a connecting portion 601. The push-down member 61 is slidably connected to the connecting portion 601 of the driving rod 60, and the push-down member 61 can slide along the length direction of the driving rod 60.

The down-pressing member 61 is slidably connected to the connecting portion 601 of the driving rod 60, so that the position of the down-pressing member 61 on the driving rod 60 can be adjusted, and the flexibility of the down-pressing assembly 6 can be further improved. When the rotational speed is sequentially detected for the plurality of valves 1, it is convenient to further align the hold-down member 61 sequentially with the valve heads 10 of the plurality of valves 1.

Further, as shown in fig. 2, a limiting member 6010 is disposed on the connecting portion 601 of the driving rod 60, and the limiting member 6010 is configured to be connected to the lower pressing member 61 to limit the lower pressing member 61 from sliding relative to the driving rod 60.

The limiting member 6010 is configured to limit the sliding of the lower pressing member 61 relative to the driving rod 60 after the position of the lower pressing member 61 is adjusted, so that the lower pressing member 61 is prevented from deviating, and the use stability of the lower pressing member 61 is improved.

In practical applications, the limiting member 6010 may be a fastening member such as a pin or a bolt.

In the present embodiment, the limiting member 6010 may be a rack disposed along the length direction of the driving rod 60. As shown in fig. 2, the lower press piece 61 is provided with a clamping member 610 adapted to the rack, and the clamping member 610 can abut between any two adjacent sets of teeth of the rack.

When the position of the lower pressing piece 61 needs to be adjusted, the lower pressing piece 61 can be directly pushed to slide on the driving rod 60 by manpower, and at the moment, the meshing force between the clamping piece 610 and the rack can be overcome by manpower. When the position of the lower pressing member 61 is adjusted, the lower pressing member 61 is released, and the sliding of the lower pressing member 61 relative to the driving rod 60 is limited by the engaging force between the clamping member 610 and the rack, so that the stability of the lower pressing member 61 is ensured.

Compared with the fastening members such as the pin shaft and the bolt, the rack and the clamping member 610 are more convenient to use, so that the limiting member 6010 is preferably a rack arranged along the length direction of the driving rod 60, and the clamping member 610 matched with the rack is arranged on the lower pressing member 61.

As shown in fig. 4, a U-shaped slot 6121 is disposed at an end of the lower pressing member 61 close to the driving rod 60, and two sides of a slot opening of the slot 6121 are respectively provided with an extension portion 6122 extending toward the slot of the slot 6121. As shown in fig. 2, the clip member 610 is rod-shaped, and the clip member 610 penetrates through the side walls of the two sides of the slot 6121 along the direction perpendicular to the depth of the slot 6121 and is mounted on the lower member 61. The driving rod 60 passes through the slot 6121 and abuts between the clamping member 610 and the extension part 6122 in the slot 6121; the rack is disposed on a side of the driving lever 60 adjacent to the catching member 610.

The U-shaped slot 6121 and the extension portion 6122 are matched with each other, so that the sliding connection between the driving rod 60 and the pressing block 612 can be realized, the pressing block 612 can be conveniently assembled and disassembled on the driving rod 60, and the use flexibility of the pressing component 6 is improved.

Wherein, the joint member 610 can be cylindrical, and the joint member 610 can be rotatably connected to the pressing block 612. The clamping member 610 is rotatably connected to the pressing block 612, so that the frictional resistance between the clamping member 610 and the rack can be reduced, and the pressing block 612 can be slid on the driving rod 60 conveniently to adjust the position of the lower member 61.

As shown in fig. 2 and 3, the valve rotation speed detecting apparatus according to the present embodiment further includes a guide plate 7, the guide plate 7 is located between the driving rod 60 and the side of the cylinder head assembly 8 on which the valve head 10 is exposed, and the guide plate 7 is fixed to the cylinder head assembly 8. A guide hole 70 is provided in the guide plate 7 at a position corresponding to the valve head 10, and the push-down piece 61 is inserted through the guide hole 70 and then abuts against the valve head 10.

The guide hole 70 can guide the process of the axial movement of the lower pressing member 61 along the valve 1, thereby improving the stability and accuracy of the interlocking process between the lower pressing member 61 and the valve head 10.

To improve the stability of the guide plate 7, the guide plate 7 may be fixed to the cylinder head assembly 8 by a fastener such as a screw.

In order to prevent the guide plate 7 from obstructing the push-down member 61 from driving the valve head 10 to lift, the guide plate 7 may be spaced from the side of the cylinder head assembly 8 where the valve head 10 is exposed, or the guide plate 7 may have a sufficient thickness such that the depth of the guide hole 70 can satisfy the moving stroke of the push-down member 61.

In the present embodiment, the guide plate 7 is preferably disposed at a distance from the side of the cylinder head assembly 8 where the valve head 10 is exposed, and specifically, the side of the guide plate 7 close to the cylinder head assembly 8 where the valve head 10 is exposed may be provided with a support pillar 71 perpendicular to the guide plate 7. When the guide plate 7 is mounted on the cylinder head assembly 8, the support pillar 71 abuts on the outer side of the cylinder head 3 of the cylinder head assembly 8 so that there is a space between the guide plate 7 and the cylinder head assembly 8.

As shown in fig. 2 and 3, the guide plate 7 is provided with a stopper hole 72 adapted to the stopper post 80 of the cylinder head assembly 8. When the guide plate 7 is installed on the cylinder head assembly 8, the limiting column 80 penetrates through the limiting hole 72, and the limiting column 80 and the limiting hole 72 are used for further improving the stability of the guide plate 7.

As shown in fig. 2, the pressing member 61 includes a push rod 611 and a pressing block 612. One end of the push rod 611 is located on the side of the guide plate 7 away from the cover of the valve 1, and the other end of the push rod 611 passes through the guide hole 70 of the guide plate 7 and abuts against the valve head 10. One end of the pressure block 612 is connected to the connecting portion 601 of the drive lever 60, and the other end is connected to the end of the push rod 611 remote from the valve head 10.

The connection mode between the push rod 611 and the pressing block 612 is not limited, and in order to improve the flexibility of the use of the lower pressing member 61, the push rod 611 and the pressing block 612 are preferably detachably connected in the present embodiment.

The detachable connection mode is butt joint, threaded connection, insertion connection and the like. In order to improve the stability and convenience of the use of the lower pressing member 61, the pressing block 612 is preferably inserted into the pushing rod 611 in the embodiment.

Further, as shown in fig. 4, a slot 6120 is formed at an end of the pressing block 612 close to the push rod 611, and an end of the push rod 611 far from the valve head 10 can be inserted into the slot 6120.

When there are a plurality of valves 1 of the cylinder head assembly 8, there are a plurality of guide holes 70 and a plurality of pressing blocks 612, and at this time, the plurality of pressing blocks 612 pass through the plurality of guide holes 70 in a one-to-one correspondence manner and abut against the valve heads 10 of the valves 1. When the rotation speed is sequentially detected for the plurality of valves 1, the push rod 611 may be sequentially connected to the plurality of pressure blocks 612.

As shown in fig. 2, a limit head 6110 is arranged at the end of the push rod 611 far away from the valve head 10, and the limit head 6110 can be attached to one side of the guide plate 7 far away from the valve 1 cover. The distance between the side of the stopper 6110 close to the push rod 611 and the side of the guide plate 7 close to the push rod 611 is equal to the maximum lift of the valve 1.

The stopper 6110 can restrain the push rod 611 in the guide hole 70, preventing the push rod 611 from passing through the guide hole 70 and falling between the guide plate 7 and the cylinder head 3.

The limiting head 6110 and the push rod 611 can be both cylindrical, and the diameter of the limiting head 6110 is larger than that of the push rod 611. The limiting hole 72 is circular, and the diameter of the limiting hole 72 is smaller than that of the limiting head 6110. The limiting head 6110 is vertically fixed on the end of the push rod 611, and the limiting head 6110 and the push rod 611 are coaxially arranged.

The distance between the side surface of the stopper 6110 close to the push rod 611 and the side surface of the guide plate 7 close to the push rod 611 is equal to the maximum lift of the valve 1, so that the maximum moving range of the lower pressing piece 61 can be ensured to be the maximum lift of the valve 1, further, when the valve 1 is driven to lift each time, the lifting value of the valve 1 can be ensured to be the maximum lift value without strictly controlling the rotation amount of the driving rod 60, the measured valve rotating speed is the rotating speed of the valve 1 after the valve 1 is fully lifted, and the validity and the accuracy of the valve rotating speed detection result can be ensured.

In practical applications, the detecting component may be a rotation speed sensor.

In the present embodiment, as shown in fig. 5 and 6, the detecting assembly includes a circular protractor 9, and an inner diameter of the protractor 9 is not smaller than an outer diameter of a valve seat 31 that is sleeved outside a disc-shaped valve seat 12 of the valve 1. The protractor 9 is sleeved outside the valve seat ring 31 and is arranged concentrically with the valve seat ring 31.

The protractor 9 is used for detecting the rotating angle of the disc-shaped valve seat 12 when the valve 1 rotates, and the rotating angle is the rotating angle of the valve 1.

The process of detecting the rotating angle of the valve 1 through the protractor 9 is as follows:

when measuring, the protractor 9 is sleeved on the valve seat ring 31 and keeps concentric with the valve seat ring. The 0 degree scale line of the protractor 9 is aligned with a preset mark on the bottom surface of the valve seat 12, and after the valve 1 rotates, the angle subtended by the mark is the rotating angle of the valve 1.

The rotating speed of the valve 1 can be calculated by substituting the angle value of the valve 1, which is detected by the protractor 9, into the formula (1):

in the formula: n is_vThe rotating speed of the valve 1; a is the autorotation angle of the valve 1 and can be detected by a protractor 9; n is the rotational speed of the engine in which the cylinder head assembly 8 is located, and is a known value; τ is the number of strokes of the engine, a known value.

In order to further reduce the error of the measurement result, in the actual measurement process, on the premise of ensuring that the lift value of the valve 1 is the maximum lift value, the valve 1 is driven to lift and lower for multiple times to measure the rotation angle of the valve 1 for multiple times, and then the average value of the multiple measurement results is taken and substituted into the formula (1) to calculate the average rotation speed of the valve 1.

Alternatively, the valve 1 may be circularly lifted and rotated several times, the total rotation angle of the valve 1 after the valve 1 is rotated several times is divided by the lifting and rotating number of the valve 1, for example, 60 times of pressing the driving lever, the total rotation angle of the valve 1 is measured, the rotation angle is divided by 10 to obtain the rotation angle of each valve 1, and finally the rotation angle of each valve 1 is substituted into the formula (1) to calculate the average rotation speed of the valve 1. When the method is used for measuring the total rotation angle of the valve 1, attention needs to be paid to whether the valve 1 rotates more than one turn, and if the valve 1 rotates more than one turn, the measured total rotation angle needs to be 360 degrees on the basis of the angle value corresponding to the mark on the bottom surface of the valve seat 12.

The protractor 9 is sleeved outside the valve seat 31 and is concentrically arranged with the valve seat 31, so that the protractor 9 can be prevented from shielding the disc-shaped valve seat 12 of the valve 1, and the process that the protractor 9 obstructs the observation of the rotating angle of the valve seat 12 can be prevented.

Compared with a rotating speed sensor, the protractor 9 is more convenient to use, and the protractor 9 does not need electricity, so that energy consumption can be saved. Moreover, the protractor 9 does not need to transmit signals, so that the detection precision can be improved, and the error can be reduced. The preferred detection assembly of this embodiment therefore comprises a circular ring-shaped protractor 9.

In summary, the valve speed detection device provided by the embodiment has the following advantages:

1. the motor is not needed to drive the cam shaft to test, so that the energy consumption can be reduced, and the measurement can be carried out when the power is cut off (stopped).

2. The distance between the side surface of the limiting head 6110 close to the push rod 611 and the side surface of the guide plate 7 close to the push rod 611 can be accurately controlled, and is equal to the maximum lift of the valve 1, so that the measurement accuracy of the valve rotating speed is improved.

3. The rotation angle of each circulation valve 1 is measured by the protractor 9, and the rotation speed of the valve 1 is calculated by combining the formula (1), so that the error is smaller, and the detection precision is higher.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The valve rotating speed detection device is characterized by comprising a pressing component (6) and a detection component;

the pressing assembly (6) comprises a driving rod (60) and a pressing piece (61), a rod body of the driving rod (60) is provided with a hinge part (600) and a connecting part (601) which are arranged at intervals, the hinge part (600) of the driving rod (60) is hinged on a fixed foreign object, and the connecting part (601) of the driving rod (60) is positioned on one side of the side surface of the cylinder cover assembly (8) on which the valve head (10) is exposed;

the pressing piece (61) is connected with a connecting part (601) of the driving rod (60), and the pressing piece (61) is abutted with the valve head (10); the driving rod (60) is used for rotating by taking the hinge part (600) as a rotating center so as to drive the lower pressing piece (61) to move along the axial direction of the valve (1) in the cylinder cover assembly (8), and the lower pressing piece (61) is used for driving the valve (1) to move along the axial direction of the valve (1) under the driving of the driving rod (60);

the detection assembly is used for detecting the rotating speed of the valve (1) when the valve (1) moves along the axial direction of the valve and rotates under the action of a valve rotating mechanism (5) of the cylinder cover assembly (8).

2. The valve speed detection apparatus according to claim 1, wherein the hinge portion (600) of the drive lever (60) is hinged to the foreign object through a horizontal rotation shaft (602) perpendicular to the axial direction of the valve (1);

and a vertical rotating shaft (603) is rotatably connected between the horizontal rotating shaft (602) and the foreign object, and the vertical rotating shaft (603) is parallel to the axial direction of the air valve (1) and is perpendicular to the horizontal rotating shaft (602).

3. The valve rotation speed detection device according to claim 1, wherein one end of the drive lever (60) is the hinge portion (600), and a shaft body between both ends of the drive lever (60) is the connection portion (601);

the pressing piece (61) is connected to the connecting portion (601) of the driving rod (60) in a sliding mode, and the pressing piece (61) can slide along the length direction of the driving rod (60).

4. The valve rotation speed detecting apparatus according to claim 3, wherein a stopper (6010) is provided on the connecting portion (601) of the drive lever (60), and the stopper (6010) is configured to be connected to the push-down member (61) to restrict the push-down member (61) from sliding with respect to the drive lever (60).

5. The valve rotation speed detecting apparatus according to claim 4, wherein the stopper (6010) is a rack provided along a length direction of the drive rod (60);

be provided with on holding down piece (61) with joint spare (610) of rack looks adaptation, joint spare (610) can the butt be in between the two adjacent teeth of arbitrary group of rack.

6. The valve speed detection device according to claim 5, wherein a U-shaped slot (6121) is formed in an end portion, close to the drive rod (60), of the lower pressing member (61), and an extension portion (6122) extending towards the slot of the slot (6121) is respectively arranged on two sides of a notch of the slot (6121);

the clamping piece (610) is rod-shaped, and the clamping piece (610) penetrates through the side walls of the two sides of the clamping groove (6121) along the direction perpendicular to the depth of the clamping groove (6121) and is installed on the lower piece (61);

the driving rod (60) penetrates through the clamping groove (6121) and abuts between the clamping piece (610) and the extension part (6122) in the clamping groove (6121); the rack is arranged on one side of the driving rod (60) close to the clamping piece (610).

7. The valve rotation speed detecting apparatus according to any one of claims 1 to 6, further comprising a guide plate (7), wherein the guide plate (7) is located between the drive rod (60) and a side of the cylinder head assembly (8) on which the valve head (10) is exposed, and the guide plate (7) is fixed to the cylinder head assembly (8);

the guide plate (7) is provided with a guide hole (70) at a position corresponding to the valve head (10), and the pressing piece (61) penetrates through the guide hole (70) and then abuts against the valve head (10).

8. The valve rotation speed detection apparatus according to claim 7, wherein the hold-down member (61) includes a push rod (611) and a pressure block (612);

one end of the push rod (611) is positioned at one side of the guide plate (7) far away from the valve (1) cover, and the other end of the push rod passes through a guide hole (70) of the guide plate (7) and then abuts against the valve head (10);

one end of the pressing block (612) is connected with the connecting part (601) of the driving rod (60), and the other end of the pressing block is connected with the end part, far away from the valve head (10), of the push rod (611).

9. The valve speed detection device according to claim 8, wherein a stopper (6110) is provided at an end of the push rod (611) away from the valve head (10), and the stopper (6110) can be attached to a side of the guide plate (7) away from the valve (1) cover;

the distance between the side surface of the limiting head (6110) close to the push rod (611) and the side surface of the guide plate (7) close to the push rod (611) is equal to the maximum lift of the valve (1).

10. The valve speed detection device according to any one of claims 1-6, wherein the detection assembly comprises an annular protractor (9), and the inner diameter of the protractor (9) is not less than the outer diameter of a valve seat ring (31) sleeved outside a disc-shaped valve seat (12) of the valve (1);

the protractor (9) is sleeved outside the valve seat ring (31) and is arranged concentrically with the valve seat ring (31).