CN216208264U - Falling ball testing machine for testing strength of oil box - Google Patents

Abstract

A falling ball testing machine for testing the strength of an oil box comprises a main body support unit, a ball holding unit and a clamp unit, wherein the ball holding unit comprises a ball holding support, an adjusting sleeve cup and a ball holder, the adjusting sleeve cup is of a hollow cylindrical structure, a plurality of clamping grooves distributed along the length direction of the cylindrical structure are arranged on the peripheral surface of the cylindrical structure, a support ring is arranged on the ball-holding support, the support ring is fixedly arranged at the upper end of the adjusting sleeve cup through a strut, two side surfaces of the support ring are symmetrically provided with fixed upright posts, the electro-magnet is installed to the lower extreme of fixed stand, the ball-holding hand include a plurality of concave plates that have the arc concave surface and set up the bracket structure in the concave plate bottom, the upper end of a plurality of concave plates is rotated through round pin axle subassembly and is installed on the side of support ring, under the state that the electro-magnet adsorbs the bracket structure, a spherical cavity is enclosed to a plurality of concave plates. The equipment can complete the impact strength test of the oil boxes with different specifications and sizes, and has the advantages of simple structure and reliable performance.

Description

Falling ball testing machine for testing strength of oil box

Technical Field

The utility model relates to the technical field of impact testing of hard plastic strength, in particular to a falling ball testing machine for testing the strength of an oil box.

Background

The core component of the centralized lubrication is an oil pump, the component of the oil pump for containing the grease is called an oil box, the oil box is usually made of hard plastics, and a ball falling test is needed to test the shock load resistance of the oil box when the oil box leaves a factory.

The falling ball testing machine is used for measuring the ultimate impact strength of the hard plastic section bar or the hard plastic. The test method has specific national standards, and is referred to as the rigid plastic drop hammer impact test method (GB/T14153-93). The standard proposes two test methods: method A-by method, a drop hammer of a certain mass is used to impact a sample at a specified height; the method B, gradient method, adopts the method of changing impact height or drop weight mass to impact the sample to obtain the impact destruction performance. The structure of present ball falling testing machine is fairly simple, and the function is also fairly single, utilizes present ball falling testing machine test extremely inconvenient to the oil box test.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a falling ball testing machine for testing the strength of an oil box, which can test the impact strength of the oil box with different specifications and sizes and has the advantages of simple structure and reliable performance.

The technical scheme adopted by the utility model is as follows: a ball falling testing machine for testing the strength of an oil box comprises a main body support unit, a ball holding unit and a clamp unit for clamping the oil box to be tested, wherein the main body support unit comprises a chassis, an installation cylinder arranged on the chassis, a support rod and a positioning ring arranged on the support rod, at least one positioning convex tooth is arranged on the positioning ring, and the clamp unit is arranged in the installation cylinder;

the ball holding unit comprises a ball holding bracket, an adjusting sleeve cup and a ball holder, the adjusting sleeve cup is of a hollow cylindrical structure, a plurality of clamping grooves distributed along the length direction of the cylindrical structure are arranged on the peripheral surface of the cylindrical structure, the lengths of the adjacent clamping grooves are different, the adjusting sleeve cup is clamped on the positioning convex teeth of the main body bracket unit through the clamping groove of the adjusting sleeve cup, the ball-holding bracket is provided with a support ring, the support ring is fixedly arranged at the upper end of the adjusting sleeve cup through a strut, two side surfaces of the support ring are symmetrically provided with fixed upright posts, the lower end of the fixed upright post is provided with an electromagnet, the ball holder comprises a plurality of concave plates with arc concave surfaces and a bracket structure arranged at the bottoms of the concave plates, the upper ends of the concave plates are rotatably arranged on the side surface of the support ring through a pin shaft assembly, under the state that the electromagnet adsorbs the bracket structure, the concave plates surround and form a spherical chamber for accommodating the ball.

Preferably, the two clamping grooves are in a group, the clamping grooves in the group are equal in length and are symmetrically arranged relative to the central line of the adjusting sleeve cup, and the clamping grooves are respectively parallel to the axis of the adjusting sleeve cup.

Preferably, the lower end of the support is provided with a threaded connection structure matched with the adjusting sleeve cup, an electric wire and a control button are arranged in the support in a penetrating manner, the electric wire is connected with the electromagnet, and the electromagnet is controlled to be powered on or powered off through the control button.

Preferably, the support ring is a circular ring-shaped member, the two sides of the circular ring-shaped member are provided with a ball holder rotating shaft, the ball holder is provided with two concave plates which are symmetrically arranged, and the two concave plates are respectively connected with the side surface of the support ring in a rotating manner through respective pin shaft assemblies.

Preferably, the bracket structure is made of armature materials and is in a shape of a [ type structure, and a striped convex structure with certain intervals and height is arranged on the surface of one side, which is in contact with the electromagnet, of the bracket structure.

Preferably, the fixture unit comprises a fixture chassis, an upper pressing plate and an elastic pressing sheet, the upper pressing plate is mounted on the upper end face of the fixture chassis, the fixture chassis is provided with a fixture chassis body, an annular protruding structure is arranged on the end face of the fixture chassis body, the protruding structure is matched with the inner edge and the outer edge of the fixture chassis to separate the upper end face of the fixture chassis into a large oil box clamping groove and a small oil box clamping groove, and the upper pressing plate and the elastic pressing sheet are respectively arranged on the protruding structure and the outer edge of the fixture chassis and used for clamping the edge of an oil box.

As the preferred scheme, protruding structure surround by a plurality of mutually independent arc protruding pieces and form, a plurality of protruding pieces pass through the retaining member and connect on the terminal surface of anchor clamps chassis, through the position of adjusting a plurality of arc protruding pieces on anchor clamps chassis to the realization is adjusted the limited oil box diameter scope of little oil box draw-in groove.

Preferably, a plurality of upper pressing plates and elastic pressing plates are uniformly distributed on the outer edges of the protruding structures and the clamp base plate along the circumferential direction.

As a preferred scheme, the upper pressure plate comprises a pressure plate main body and a pressing plate clamping groove arranged on the end face of the pressure plate main body, the pressure plate main body is fixedly connected to the outer edges of the protruding structures and the clamp chassis through locking pieces, and the side face of the pressure plate main body is further provided with a guide round angle.

Preferably, the elastic pressing sheet is further provided with an arc-shaped locking protrusion, and a limiting surface of the locking protrusion is matched with the edge of the oil box to clamp the oil box on the clamp unit.

The utility model has the beneficial effects that:

this scheme provides a falling ball testing machine for testing oil box intensity through the structural design of innovation, and the impact property test of oil box among the mainly used centralized lubrication system has many grades of high regulatory functions, and the oil box of testable multiple specification size can use different specification steel balls to test, and is simple reliable, and specific technological effect is as follows:

firstly, the utility model can be used for testing the shock resistance of the oil box of the centralized lubrication system through innovation, the use reliability of the oil box is ensured, meanwhile, the falling ball height can be quickly adjusted, the efficiency of the adjustment is higher than that of the adjustment by using an electric lead screw in the past, and the adjustment is more convenient than that of the sliding and locking mode on a guide rail with scales in the past.

Secondly, the ball holding assembly is optimized as follows, the ball holding assembly can be suitable for steel balls with various specifications and sizes by adjusting the number of the concave plates in the ball holding hand or changing the shape of the concave plates, and the ball holding assembly has the advantage of strong universality.

Thirdly, the utility model changes the way of lifting and absorbing the steel ball by the electromagnet into the way of lifting the ball by the ball-holding hand through innovation, and the gravity of the steel ball is decomposed by the ball-holding hand, and the electromagnet can hold the ball only by providing a small force under the mutual occlusion action of the stripe structures on the surface of the armature, thereby reducing the power consumption requirement of the whole device.

Fourthly, the adjusting sleeve cup can be made into a plurality of specifications, the height difference of the sleeve cup clamping grooves of the various specifications is different, the corresponding adjusting sleeve cup is selected according to the test requirement, the falling height of the steel ball is changed by utilizing a method of rotationally adjusting the sleeve cup, and the device is simpler than manual measuring adjustment and electric adjusting devices, more convenient to use and high in reliability.

Fifthly, the oil box clamping assembly is optimized, can be placed on a placing table of a falling ball testing machine and positioned by dead weight, so that the rapid oil box can be clamped, and the oil box clamping device has the advantage of convenience in clamping, so that the falling ball impact test result is more accurate, and the process is safer; meanwhile, the protruding structure is formed by surrounding a plurality of mutually independent arc-shaped protruding blocks, the protruding blocks are connected to the end face of the clamp chassis through locking pieces, and the diameter range of the oil box limited by the small oil box clamping grooves is adjusted by adjusting the positions of the arc-shaped protruding blocks on the clamp chassis, so that the oil boxes with various specifications can be clamped by one clamp.

Drawings

In order to more clearly illustrate the embodiments or technical solutions of the present invention in the prior art, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only 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 schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a main body support unit;

FIG. 3 is a schematic structural view of a ball holding unit;

FIG. 4 is a schematic structural view of a ball holding support;

FIG. 5 is a schematic view of a structure of a player;

FIG. 6 is a schematic view of the structure of the adjustment sleeve;

FIG. 7 is a schematic structural view of a gripper unit;

FIG. 8 is a schematic view of one embodiment of a clamp base;

FIG. 9 is a schematic structural view of the upper platen;

fig. 10 is a schematic structural view of the elastic pressing sheet.

The labels in the figure are: 1. a main body support unit, 11, a chassis, 12, an installation cylinder, 13, a support rod, 14, a positioning ring, 15, a positioning convex tooth, 2, a ball holding unit, 21, a ball holding support, 211, a threaded connection structure, 212, a quadrangular prism, 213, a wire perforation, 214, a control button, 215, a support ring, 216, a fixed upright post, 217, an electromagnet, 218, a ball holder rotating shaft, 22, a cylindrical pin, 23, a ball holding hand, 231, a concave plate, 232, a bracket structure, 233, a double rotating shaft, 24, an adjusting sleeve cup, 241, a clamping groove, 242, a threaded hole, 3, a clamp unit, 31, a clamp chassis, 311, a clamp chassis main body, 312, a big oil box clamping groove, 313, a big oil box pressing plate fixing threaded hole, 314, a small oil box clamping groove, 315, a small oil box pressing plate fixing threaded hole, 316, a lifting ring, 317, a convex structure, 32, an upper pressing plate, 321, a pressing plate main body, 322, a pressing plate clamping groove, 323, a fixing threaded hole, 324. the guide round corner 33, the elastic pressing piece 331, the positioning connecting hole 332, the locking protrusion 34 and the hexagon socket head cap screw.

Detailed Description

The utility model is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

It should be noted that: unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the terms "a" and "an" or "the" and similar referents in the description and claims of the present invention are not to be construed as limiting in number, but rather as indicating the presence of at least one. The word "comprise" or "comprises", and the like, indicates that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, but does not exclude other elements or items having the same function.

Examples 1,

The detailed structure of the present embodiment is described below with reference to fig. 1 to 10:

as shown in fig. 1 and 2, a ball drop tester for testing the strength of an oil cartridge comprises a main body support unit 1, a ball holding unit 2 and a clamp unit 3 for clamping the oil cartridge to be tested, wherein the main body support unit 1 comprises a chassis 11, a mounting cylinder 12 arranged on the chassis 11, a support rod 13 fixedly arranged on the chassis and a positioning ring 14 arranged on the support rod 13, at least one positioning convex tooth 15 is arranged on the positioning ring 14, in the embodiment, two positioning convex teeth 15 are arranged and symmetrically arranged along the axis of the positioning ring 14, the clamp unit 3 is arranged in the mounting cylinder 12, and the ball holding unit 2 is mounted on the positioning ring 14 through a component and is clamped with the positioning convex teeth 15 on the positioning ring 14;

as shown in fig. 3-6, the ball holding unit 2 mainly comprises a ball holding support 21, a ball holding hand 23 and an adjusting sleeve 24, the adjusting sleeve 24 is a cylindrical tube, the upper end of the adjusting sleeve is provided with a threaded hole 242, the ball holding support 21 is fixedly installed in the threaded hole 242 through a threaded structure, the outer circumferential surface of the cylindrical tube is provided with a plurality of slots 241 distributed along the length direction of the cylindrical tube, the lengths of the adjacent slots 241 are different, as shown in fig. 4, the ball holding support 21 mainly comprises a quadrangular prism 212, a support ring 215, a fixed upright 216 and an electromagnet 217, the lower end of the quadrangular prism 212 is provided with a threaded connection structure 211, the quadrangular prism 212 is installed in the threaded hole 242 through the threaded connection structure 211 and is fixedly installed with the adjusting sleeve to form an integral structure, the upper end of the quadrangular prism 212 is fixedly connected with the support ring 215, two side faces of the support ring 215 are symmetrically connected with the fixed upright 216, an electromagnet 217 is installed at the lower end of the fixed upright post 216, a wire perforation 213 and a control button 214 are arranged on the quadrangular prism 212, a wire is arranged in the quadrangular prism in a penetrating manner to connect the electromagnet and the control button, and the electromagnet is controlled to be powered on or powered off through the control button; the ball holder 23 comprises a plurality of concave plates 231 with arc concave surfaces and a bracket structure 232 which is arranged at the bottom of the concave plates 231 and is made of magnetic materials, the upper ends of the concave plates 231 are rotatably arranged in holes of a ball holder rotating shaft 218 on the side surface of the supporting ring 215 through cylindrical pins 22 to form a rotating connection relationship, and under the power-on state of the electromagnet 217, the bracket structure 232 can be adsorbed, and the concave plates 231 are driven by the bracket structure 232 to rotate along respective pin shafts 22 and to be enclosed to form a spherical cavity for accommodating balls.

In this embodiment, the locking slots 241 are respectively parallel to the axis of the adjusting sleeve 24, and in addition, in order to ensure the installation stability of the adjusting sleeve 24, the following arrangement modes can be adopted: the two clamping grooves 241 are in a group, the lengths of the clamping grooves in the group are equal, and the clamping grooves are symmetrically arranged relative to the central line of the adjusting sleeve cup 24; in addition, the length difference of the adjacent clamping grooves is set according to the requirement, for example, 5 cm.

In this embodiment, the support ring 215 is an annular member, a ball holder rotating shaft 218 is provided on both sides of the annular member, and the ball holder rotating shaft 218 is fitted to a double rotating shaft 233 provided at an end of the concave plate 231 by a cylindrical pin.

In this embodiment, the described holder 23 is composed of two concave plates 231, and the two concave plates 231 are symmetrically arranged and form a spherical chamber for accommodating the falling ball, and the spherical chamber can realize the self-centering function of the ball to be tested.

In this embodiment, the bracket structure 232 is made of a magnetic armature material, which is beneficial to enhancing the adsorption force of the electromagnet, and the shape of the bracket structure is a [ type structure, so that when two concave plates 231 hold up the ball to be tested, two sides of the bracket structure 232 at the bottom of the concave plates are adsorbed on the electromagnet, and a stripe convex structure with a certain distance and height is arranged on the surface of one side of the bracket structure 232 in contact with the electromagnet.

And (3) mounting of the components: the intrados of the two ball holders 23 are oppositely arranged, and the double rotating shafts 233 of the ball holders 23 are fixedly connected with the ball holder rotating shafts 218 by the cylindrical pins 22; aligning the threaded connection structure 211 of the ball-holding bracket 21 with the threaded hole 242 above the adjusting sleeve cup 24 and then screwing; the support ring 215 on the ball-holding support 21 is now aligned with the adjustment sleeve 24 along the central axis; after passing through the wire hole 213, the power cord is connected to the control button 214.

As shown in fig. 7-10, the clamp unit 3 includes a clamp chassis 31, an upper pressing plate 32 and an elastic pressing plate 33, the upper pressing plate 32 is mounted on the upper end surface of the clamp chassis, the upper pressing plate 32 is fixed on the end surface of the clamp chassis 31 by hexagon socket head cap screw 34, as shown in fig. 8, the clamp chassis 31 is provided with a clamp chassis body 311, an annular protrusion 317 is provided on the end surface of the clamp chassis body 311, the clamp chassis body 311 is provided with an inner edge and an outer edge having the same height as the protrusion 317, the protrusion 317 is matched with the inner edge and the outer edge of the clamp chassis body 311 to separate the upper end surface of the clamp chassis body 311 into a large oil box slot 312 and a small oil box slot 314, the outer edges of the protrusion and the clamp chassis body are respectively provided with an upper pressing plate and an elastic pressing plate for clamping the edge of the oil box, the protrusion is provided with a small oil box pressing plate fixing screw hole 315, the clamp chassis is used for fixing the corresponding upper pressing plate and the elastic pressing sheet, and the outer edge of the clamp chassis body is provided with a large oil box pressing plate fixing screw hole 313 for the corresponding upper pressing plate and the elastic pressing sheet;

in this embodiment, four strip-shaped upper press plates 32 are uniformly distributed on the outer edges of the protrusion 317 and the clamp chassis body 311 along the circumferential direction to limit the degree of freedom of the vertical movement of the oil box, each upper press plate 32 comprises a press plate main body 321 and a pressing sheet clamping groove 322 arranged on the end surface of the press plate main body, and the elastic pressing sheet 33 is installed in the pressing sheet clamping groove 322 preset in the upper press plate 32; for example, the following steps are carried out: taking the upper pressing plate arranged on the convex structure as an example, the convex structure 317 is provided with a small oil box pressing plate fixing screw hole 315, and the upper pressing plate 32 is fixed by a locking screw passing through a fixing screw hole 323 on the upper pressing plate 32 and screwed in the small oil box pressing plate fixing screw hole 315.

In this embodiment, the side surface of the pressing plate main body 321 is further provided with a guiding fillet 324 for guiding the edge of the oil box to enter the clamping groove during rotation, the elastic pressing plate 33 is further provided with an arc-shaped locking protrusion 332, and a limiting surface of the locking protrusion 332 is matched with the edge of the oil box for clamping the oil box on the clamp unit; when the oil box is screwed in, the screw hole on the oil box is matched with the locking protrusion 332 on the pressing sheet to realize positioning.

In this embodiment, two screens are established to oil box dress card subassembly, and big oil box draw-in groove is used for the clamping big oil box, and little oil box draw-in groove is used for the clamping little oil box. During clamping, the opening end of the oil box is downward, the oil box is pressed into the corresponding clamping groove and then rotates clockwise, the elastic pressing sheet has certain elasticity, when the bolt hole in the oil box is just matched with the protrusion, a sound of the clamping can be generated, and the falling ball strength impact test can be performed on the oil box after the oil box is clamped.

It should be noted that: different protruding mechanisms of this scheme accessible change realize the oil box of dress card different specifications.

The oil box is clamped according to the following method, the opening of the oil box is downward, the end part of the oil box is aligned to a corresponding clamping groove, the oil box rotates clockwise, an elastic pressing sheet is arranged on an upper pressing plate until the protrusion of the elastic pressing sheet is matched with a positioning screw hole of the oil box, the oil box is clamped, a control button is pressed, the electromagnet is electrified at the moment, the electromagnet attracts two arc-shaped concave plates, the surface of the electromagnet, which is in contact with a bracket structure of a holder, is rough and provides a certain friction force, the supporting force for the holder to lift a steel ball can be provided without large electric power, a ball falling test can be carried out after a test steel ball is placed into the concave plates, according to test rules, the adjustment sleeve cup is rotated on the table to enable the next group of clamping grooves to be aligned to the positioning convex teeth, the steel ball is placed downwards in place, the electromagnet is electrified again, and the steel ball is loaded for testing.

Examples 2,

It should be noted that: compared with embodiment 1, in embodiment 2, except for the arrangement of the protruding structures in the clamp unit 3, the other structural components are completely the same, and therefore, the structures and the installation position relationship of other components are not described one by one;

in this embodiment, the protruding structure 317 is surrounded by a plurality of mutually independent arc-shaped protruding blocks and is formed, a plurality of threaded holes can be preprocessed on the end face of the clamp chassis body 31 in advance, and the protruding blocks are connected on the end face of the clamp chassis through locking screws, so that the diameter range of the oil box limited by the small oil box clamping groove can be adjusted by adjusting the positions of the arc-shaped protruding blocks on the clamp chassis, and the oil box with various specifications can be clamped by one clamping assembly.

It should be noted that while the utility model has been described in terms of the above-mentioned embodiments, other embodiments are also possible. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model, and it is intended that all such changes and modifications be covered by the appended claims and their equivalents.

Claims (10)

1. The utility model provides a falling ball testing machine for testing oil box intensity comprises main part support unit, holds the ball unit and is used for the anchor clamps unit of the examination oil box that awaits measuring of centre gripping, its characterized in that: the main body support unit comprises a chassis, an installation cylinder arranged on the chassis, a support rod and a positioning ring arranged on the support rod, wherein at least one positioning convex tooth is arranged on the positioning ring, and the clamp unit is arranged in the installation cylinder;

the ball holding unit comprises a ball holding bracket, an adjusting sleeve cup and a ball holder, the adjusting sleeve cup is of a hollow cylindrical structure, a plurality of clamping grooves distributed along the length direction of the cylindrical structure are arranged on the peripheral surface of the cylindrical structure, the lengths of the adjacent clamping grooves are different, the adjusting sleeve cup is clamped on the positioning convex teeth of the main body bracket unit through the clamping groove of the adjusting sleeve cup, the ball-holding bracket is provided with a support ring, the support ring is fixedly arranged at the upper end of the adjusting sleeve cup through a strut, two side surfaces of the support ring are symmetrically provided with fixed upright posts, the lower end of the fixed upright post is provided with an electromagnet, the ball holder comprises a plurality of concave plates with arc concave surfaces and a bracket structure arranged at the bottoms of the concave plates, the upper ends of the concave plates are rotatably arranged on the side surface of the support ring through a pin shaft assembly, under the state that the electromagnet adsorbs the bracket structure, the concave plates surround and form a spherical chamber for accommodating the ball.

2. The falling ball testing machine for testing the strength of the oil box according to claim 1, characterized in that: the two clamping grooves are in a group, the lengths of the clamping grooves in the group are equal, the clamping grooves are symmetrically arranged relative to the central line of the adjusting sleeve cup, and the clamping grooves are respectively parallel to the axis of the adjusting sleeve cup.

3. The falling ball testing machine for testing the strength of the oil box according to claim 1, characterized in that: the lower end of the support is provided with a threaded connection structure matched with the adjusting sleeve cup, an electric wire and a control button which are connected with the electromagnet are arranged in the support in a penetrating mode, and the electromagnet is controlled to be powered on or powered off through the control button.

4. The falling ball testing machine for testing the strength of the oil box according to claim 1, characterized in that: the support ring be the ring form component, be equipped with in the both sides of ring form component and hold the ball pivot, the ball hand of holding be equipped with two gibs, two gibs symmetry set up, two gibs rotate with the side of support ring through respective round pin axle subassembly respectively and are connected.

5. The falling ball testing machine for testing the strength of the oil box according to claim 1, characterized in that: the bracket structure is made of armature materials and is in a [ type structure, and a stripe convex structure with certain distance and height is arranged on the surface of one side of the bracket structure, which is in contact with the electromagnet.

6. The falling ball testing machine for testing the strength of the oil box according to claim 1, characterized in that: the clamp unit comprises a clamp chassis, an upper pressing plate and an elastic pressing sheet, wherein the upper pressing plate and the elastic pressing sheet are installed on the upper end face of the clamp chassis, the clamp chassis is provided with a clamp chassis body, an annular protruding structure is arranged on the end face of the clamp chassis body, the protruding structure is matched with the inner edge and the outer edge of the clamp chassis to separate the upper end face of the clamp chassis to form a large oil box clamping groove and a small oil box clamping groove, and the upper pressing plate and the elastic pressing sheet which are used for clamping the edge of an oil box are respectively arranged on the outer edges of the protruding structure and the clamp chassis.

7. The falling ball testing machine for testing the strength of the oil box according to claim 6, wherein: protruding structure surround by a plurality of mutually independent arc protruding pieces and form, a plurality of protruding pieces pass through the retaining member and connect on the terminal surface on anchor clamps chassis, through the position of adjusting a plurality of arc protruding pieces on anchor clamps chassis to the oil box diameter scope that little oil box draw-in groove is injectd is adjusted in the realization.

8. The falling ball testing machine for testing the strength of the oil box according to claim 6, wherein: and a plurality of upper pressing plates and elastic pressing plates are uniformly distributed on the outer edges of the protruding structures and the clamp base plate along the circumferential direction.

9. The falling ball testing machine for testing the strength of the oil box according to claim 6, wherein: the upper pressing plate comprises a pressing plate main body and pressing plate clamping grooves formed in the end face of the pressing plate main body, the pressing plate main body is fixedly connected to the outer edges of the protruding structures and the clamp chassis through locking pieces, and guide round corners are further arranged on the side faces of the pressing plate main body.

10. The falling ball testing machine for testing the strength of the oil box according to claim 6, wherein: the elastic pressing sheet is also provided with an arc-shaped locking protrusion, and the limiting surface of the locking protrusion is matched with the edge of the oil box to clamp the oil box on the clamp unit.

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