Gap detection equipment for constant velocity universal joint driving shaft assembly

Abstract

The invention relates to the technical field of driving shaft assembly detection tools, and discloses a gap detection device for a constant velocity universal joint driving shaft assembly. The device comprises a base box, the base box is provided with an axial clearance detection assembly, and the axial clearance detection assembly is provided with a radial clearance detection assembly; the axial clearance detection assembly comprises two movable measuring frames and a rotating disc rotatably installed on the measuring frames, and the rotating disc is rotatably provided with a first fixing assembly used for fixing a universal joint of a driving shaft assembly. The top of the base box is provided with a second fixing assembly used for fixing an intermediate shaft of the driving shaft assembly and two second laser range finders used for detecting the axial displacement degree of the measuring frame. According to the invention, axial clearance detection and radial clearance detection can be carried out on the driving shaft assembly at the same time, diversification of clearance detection of the driving shaft assembly is completed, and the detection efficiency is not affected at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of drive shaft assembly detection tools, and in particular to a clearance detection device for a constant velocity universal joint drive shaft assembly. Background Art

[0002] The ‌Constant Velocity Joint Drive Shaft Assembly‌ is an important component in the automobile transmission system. It is mainly used to transfer the engine power from the transmission to the drive wheels, meet the requirements of the outer end angle of the car's drive shaft, and compensate for the bounce of the inner end suspension of the car to ensure the stability of the car's high-speed driving. It is mainly composed of an intermediate shaft and constant velocity joints arranged at both ends of the intermediate shaft. Due to assembly problems, the drive shaft assembly may have a problem of excessive gap between the intermediate shaft and the universal joint after assembly. Once the gap is too large, it will affect the stability between the two. Therefore, after the drive shaft assembly is assembled, it is necessary to use a gap detection tool to detect the gap to ensure that the assembled drive shaft assembly meets the requirements and can remain stable during the driving process.

[0003] When the axial clearance of the drive shaft assembly is detected, the intermediate shaft and the universal joint of the drive shaft assembly are generally fixed, and then the universal joint is pushed and pulled, and the axial clearance is determined and detected by the displacement of the universal joint and the intermediate shaft. For example, the related technology (CN103808235B) discloses a clearance detection device for a constant velocity universal joint drive shaft assembly, which belongs to the field of automobile manufacturing. The device includes a fixed component, a push-pull component, a measuring component, a control component and an operating table, the fixed component is fixedly connected to the operating table, the push-pull component is slidably connected to the operating table, the measuring component is respectively connected to the push-pull component and the operating table, the control component is arranged on the operating table, and the fixed component, the push-pull component and the measuring component are all connected to the control component.

[0004] However, the gap between the intermediate shaft and the universal joint of the drive shaft assembly is divided into axial gap and radial gap, and the current gap detection tools can generally only perform axial gap detection on the drive shaft assembly, that is, detect the axial gap between the intermediate shaft and the universal joint, but cannot simultaneously realize radial gap detection of the drive shaft assembly, which is relatively inconvenient. Therefore, it is necessary to propose a gap detection device that can perform two gap detections at the same time. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a clearance detection device for a constant velocity universal joint drive shaft assembly.

[0006] The present invention is implemented by the following technical scheme: a base box, an axial clearance detection component is arranged on the base box, and a radial clearance detection component is arranged on the axial clearance detection component; The axial clearance detection assembly includes two movable weighing frames and a turntable rotatably mounted on the weighing frames, a first fixing assembly for fixing the universal joint of the drive shaft assembly is rotatably arranged on the turntable, a second fixing assembly for fixing the intermediate shaft of the drive shaft assembly and two second laser rangefinders for detecting the axial displacement of the weighing frames are arranged on the top of the base box, thereby driving the universal joint of the drive shaft assembly to move axially through the first fixing assembly, and determining the displacement of the weighing frame through the second laser rangefinder, thereby detecting the axial clearance of the drive shaft assembly; The radial clearance detection assembly includes a connecting rod fixedly mounted on a rotating disk, the connecting rod is provided with a reverse thrust mechanism for pushing against the intermediate shaft of the drive shaft assembly, the reverse thrust mechanism is provided with a first laser rangefinder for detecting the displacement of the reverse thrust mechanism, so that the rotating disk can drive the reverse thrust assembly and the first laser rangefinder to rotate around the intermediate shaft of the drive shaft assembly, and perform all-round radial clearance detection on the drive shaft assembly in a reverse thrust manner.

[0007] As a further improvement of the above scheme, a reciprocating screw and a motor for driving the reciprocating screw are rotatably arranged in the base box, the reciprocating screw is transmission-connected to the turntable, two moving blocks are threadedly sleeved on the reciprocating screw, and both moving blocks are connected to the measuring frame.

[0008] As a further improvement of the above scheme, a redundant mechanism is arranged on the moving block, and the redundant mechanism includes two sliding rods arranged on both sides of the moving block, and the sliding sleeves on the two sliding rods are provided with the same moving frame and four first springs. The base of the measuring frame is fixedly connected to the moving frame, so that when the moving block performs axial clearance detection on the drive shaft assembly through the axial clearance detection component, it will not cause excessive pushing and pulling on the universal joint and can better adapt to the drive shaft assembly with different axial clearances.

[0009] As a further improvement of the above scheme, a connecting frame is provided on one side of the movable frame, a hexagonal sleeve is rotatably installed on the connecting frame, a hexagonal rod fixedly connected to the reciprocating screw is slidably installed in the hexagonal sleeve, synchronous wheels are provided on the hexagonal sleeve and the turntable, and synchronous belts are provided on both pairs of synchronous wheels, so that the reciprocating screw can not only drive the synchronous wheel to rotate, but also allow the synchronous wheel to move synchronously with the movable frame.

[0010] As a further improvement of the above scheme, the reverse thrust mechanism includes a sleeve, the first laser rangefinder is fixedly connected to the sleeve, a push rod and a second spring for pushing the push rod are slidably installed in the sleeve, the top end of the push rod corresponds to the first laser rangefinder, when the bottom end of the push rod contacts the middle shaft of the drive shaft assembly, the middle shaft is pushed, and the radial clearance of the drive shaft assembly is determined by the axial movement distance of the push rod.

[0011] As a further improvement of the above solution, a roller is provided at the bottom end of the push rod, so that when the push rod rotates around the intermediate shaft of the drive shaft assembly, it will not cause wear to the intermediate shaft.

[0012] As a further improvement of the above scheme, the connecting rod is composed of a sleeve and a telescopic rod, and the telescopic rod is provided with two upper and lower blocks, both of which extend outside the sleeve and are slidably connected to the sleeve, and two third springs are limitedly provided on the sleeve, and the two third springs are located on both sides of the two blocks, so that when the axial clearance of the drive shaft assembly is detected, the connecting rod will adaptively extend and retract without causing the reverse thrust assembly to move axially.

[0013] As a further improvement of the above scheme, an articulated frame is provided at the bottom of the second fixed component, and the articulated frame consists of a base, a telescopic frame hingedly mounted on the base and hinged to the bottom of the second fixed component, so that the second fixed component can limit the axial movement of the intermediate shaft of the drive shaft assembly while not restricting its radial movement.

[0014] As a further improvement of the above solution, the first fixing assembly and the second fixing assembly are both composed of a limiting block provided with a limiting groove and a clamping block slidably installed in the limiting groove, and a hydraulic rod for driving the clamping block to rise and fall is provided at the bottom of the limiting block.

[0015] Compared with the prior art, the present invention has the following beneficial effects: By improving the axial clearance detection component, it also has the radial clearance detection function, and combined with the reciprocating displacement component, when the clearance detection of the drive shaft assembly is performed, the axial clearance detection component can not only axially push and pull the universal joint of the drive shaft assembly to realize the axial clearance detection, but also drive the radial clearance detection component to rotate around the intermediate shaft of the drive shaft assembly, and perform radial clearance detection on it by reverse thrust. Moreover, the two detections can be performed simultaneously without interfering with each other, which not only meets the demand for radial clearance detection of the drive shaft assembly, but also does not affect the overall detection efficiency. By arranging a redundant mechanism consisting of a slide rod, a moving frame and a first spring between the measuring frame and the moving block, when the reciprocating screw drives the axial clearance detection assembly to move through the moving block, even if the clearance between the intermediate shaft of the drive shaft assembly and the universal joint cannot match the reciprocating movement spacing of the moving block, it will not restrict the normal movement of the moving block, and the moving block will not cause damage to the drive shaft assembly due to the movement spacing exceeding the clearance upper limit of the drive shaft assembly, thereby ensuring the normal operation of the reciprocating displacement assembly without affecting the axial clearance detection; When the axial clearance of the drive shaft assembly is detected, the turntable and the first fixed component will push and pull the universal joint of the drive shaft assembly, thereby driving the radial clearance detection component to move axially together. In order to avoid the roller on the abutment rod from causing wear to the intermediate shaft on the drive shaft assembly during axial movement, the connecting rod is improved to have the ability to reciprocate, retract and reset, so that when the turntable drives the connecting rod to move axially, it will be adaptively retracted and retracted, and will not drive the reverse thrust mechanism to move axially on the intermediate shaft of the drive shaft assembly; When the axial clearance of the drive shaft assembly is detected, the universal joint needs to be pushed and pulled, and the intermediate shaft needs to be kept limited to prevent the intermediate shaft from axial movement. When the radial clearance of the drive shaft assembly is detected, the intermediate shaft needs to be able to achieve multi-angle radial movement while being unable to move axially. By providing an articulated frame between the second fixed component and the base box, the second fixed component can not only axially limit the intermediate shaft of the drive shaft assembly, but also allow the intermediate shaft to achieve multi-angle radial movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A front view showing a clearance detection device for a constant velocity universal joint drive shaft assembly of the present invention; Figure 2 A rear-view display diagram of a clearance detection device for a constant velocity universal joint drive shaft assembly of the present invention; Figure 3 This is a disassembled display diagram of a clearance detection device for a constant velocity universal joint drive shaft assembly of the present invention; Figure 4 It is an assembly display diagram of the axial clearance detection component and the radial clearance detection component; Figure 5 This is a disassembled display diagram of the reciprocating displacement component; Figure 6 This is a disassembled display diagram of the partial structure of the axial clearance detection component; Figure 7 It is a radial clearance detection component and its partial cross-sectional view; Figure 8 This is a diagram showing the assembly of the second fixing component and the articulated frame.

[0017] Description of main symbols: 1. Base box; 2. Motor; 3. Reciprocating screw; 4. Moving block; 5. Sliding rod; 6. Moving frame; 7. First spring; 8. Weighing frame; 9. Turntable; 10. Hexagonal bushing; 11. Hexagonal rod; 12. Synchronous wheel; 13. Synchronous belt; 14. First fixed component; 15. Connecting rod; 16. Sleeve; 17. Push rod; 18. Second spring; 19. First laser rangefinder; 20. Second laser rangefinder; 21. Articulated frame; 22. Second fixed component. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0019] Please combine Figures 1 to 8 , a clearance detection device for a constant velocity universal joint drive shaft assembly, comprising: a base box 1, an axial clearance detection component is arranged on the base box 1, a radial clearance detection component is arranged on the axial clearance detection component, the axial clearance detection component comprises two movable measuring frames 8 and a turntable 9 rotatably mounted on the measuring frame 8, a first fixing component 14 for fixing the universal joint of the drive shaft assembly is rotatably arranged on the turntable 9, a second fixing component 22 for fixing the intermediate shaft of the drive shaft assembly and two second laser rangefinders 20 for detecting the axial displacement of the measuring frame 8 are arranged on the top of the base box 1, thereby driving the universal joint of the drive shaft assembly to move axially through the first fixing component 14, and judging the displacement of the measuring frame 8 through the second laser rangefinder 20, thereby detecting the axial clearance of the drive shaft assembly, the radial clearance detection component comprises a connecting rod 15 fixedly mounted on the turntable 9, the connecting rod 15 is composed of a sleeve and a telescopic rod, an upper and lower abutment blocks are arranged on the telescopic rod, both abutment blocks extend outside the sleeve and are slidably connected to the sleeve, two third springs are limitedly sleeved on the sleeve, and two A third spring is located on both sides of the two abutments, so that when the axial clearance of the drive shaft assembly is detected, the connecting rod 15 will adaptably expand and contract without causing the reverse thrust assembly to move axially. A reverse thrust mechanism for pushing the intermediate shaft of the drive shaft assembly is provided on the connecting rod 15. The reverse thrust mechanism includes a sleeve 16, in which a push rod 17 and a second spring 18 for pushing the push rod 17 are slidably installed. The top end of the push rod 17 corresponds to the first laser rangefinder 19. When the bottom end of the push rod 17 contacts the intermediate shaft of the drive shaft assembly, , will push the intermediate shaft, and determine the radial clearance of the drive shaft assembly by the axial movement distance of the push rod 17. A roller is provided at the bottom end of the push rod 17, so that when the push rod 17 rotates around the intermediate shaft of the drive shaft assembly, it will not cause wear to the intermediate shaft. A first laser rangefinder 19 for detecting the displacement of the reverse thrust mechanism is provided on the sleeve 16, so that the turntable 9 can drive the reverse thrust component and the first laser rangefinder 19 to rotate around the intermediate shaft of the drive shaft assembly, and perform all-round radial clearance detection on the drive shaft assembly in a reverse thrust manner.

[0020] Through the above technical scheme, when the clearance of the drive shaft assembly is detected, the axial clearance detection component can not only axially push and pull the universal joint of the drive shaft assembly to realize axial clearance detection, but also drive the radial clearance detection component to rotate around the intermediate shaft of the drive shaft assembly and perform radial clearance detection on it by reverse thrust. Moreover, the two detections can be carried out simultaneously without interfering with each other, which not only meets the demand for radial clearance detection of the drive shaft assembly, but also does not affect the overall detection efficiency.

[0021] A reciprocating displacement assembly is provided in the base box 1, and the reciprocating displacement assembly includes a reciprocating screw 3 rotatably installed in the base box 1 and a motor 2 for driving the reciprocating screw 3. Meshing gears are provided on the output shaft of the motor 2 and the reciprocating screw 3. Reciprocating threads are provided at both ends of the reciprocating screw 3, which can drive two moving blocks 4 to move back and forth at the same time when rotating. The reciprocating screw 3 is transmission-connected with the turntable 9. Two moving blocks 4 are threadedly sleeved on the reciprocating screw 3. A slide rail is slidably provided on the moving block 4. The slide rail is fixedly connected to the bottom inner wall of the base box 1. The two moving blocks 4 are both connected to the measuring frame 8. Slide rods 5 are provided on both sides of the moving block 4. The two slide rods 5 are slidably sleeved with the same moving frame 6 and four first springs 7, thereby forming a redundant mechanism of the moving block 4. The base of the measuring frame 8 is fixedly connected to the moving frame 6, so that when the moving block 4 performs axial clearance detection on the drive shaft assembly through the axial clearance detection assembly, it will not cause excessive push and pull on the universal joint, thereby better adapting to the drive shaft assembly with different axial clearances.

[0022] Through the above technical scheme, the reciprocating displacement assembly can not only drive the turntable 9 to reciprocate and translate to realize the axial clearance detection of the drive shaft assembly, but also drive the turntable 9 to rotate to realize the radial clearance detection of the drive shaft assembly. Moreover, by arranging a redundant mechanism on the reciprocating displacement assembly, when the reciprocating screw 3 drives the axial clearance detection assembly to move through the moving block 4, even if the clearance between the intermediate shaft of the drive shaft assembly and the universal joint cannot match the reciprocating movement spacing of the moving block 4, it will not restrict the normal movement of the moving block 4. At the same time, the moving block 4 will not cause damage to the drive shaft assembly due to the movement spacing exceeding the clearance upper limit of the drive shaft assembly, thereby ensuring the normal operation of the reciprocating displacement assembly without affecting the axial clearance detection.

[0023] A connecting frame is provided on one side of the movable frame 6, on which a hexagonal sleeve 10 is rotatably installed, in which a hexagonal rod 11 fixedly connected to the reciprocating screw rod 3 is slidably installed, and synchronous wheels 12 are provided on the hexagonal sleeve 10 and the turntable 9, and two pairs of synchronous wheels 12 are both sleeved with synchronous belts 13, so that the reciprocating screw rod 3 can not only drive the synchronous wheel 12 to rotate, but also allow the synchronous wheel 12 to move synchronously with the movable frame 6.

[0024] Through the above technical solution, when the reciprocating screw 3 rotates, it can not only drive the axial clearance detection component to move to complete the axial clearance detection of the drive shaft assembly, but also drive the turntable 9 and the radial clearance detection component to rotate to complete the radial clearance detection of the drive shaft assembly.

[0025] An articulated frame 21 is provided at the bottom of the second fixed component 22, and the articulated frame 21 consists of a base, a telescopic frame hingedly mounted on the base and hinged to the bottom of the second fixed component 22, so that the second fixed component 22 can limit the axial movement of the intermediate shaft of the drive shaft assembly while not limiting its radial movement, so that the axial clearance detection and radial clearance detection of the drive shaft assembly will not restrict each other.

[0026] The first fixing assembly 14 and the second fixing assembly 22 are both composed of a limiting block provided with a limiting groove and a clamping block slidably installed in the limiting groove. A hydraulic rod for driving the clamping block to rise and fall is provided at the bottom of the limiting block.

[0027] The implementation principle of a clearance detection device for a constant velocity universal joint drive shaft assembly in the embodiment of the present application is as follows: When the clearance of the drive shaft assembly is detected, the intermediate shaft of the drive shaft assembly is fixed to the second fixing assembly 22, and then the spline ends of the universal joints at both ends are fixed to the two first fixing assemblies 14. At this time, the reverse thrust mechanism (reverse rod 17) on the radial clearance detection assembly pushes the intermediate shaft of the drive shaft assembly; The reciprocating screw rod 3 is driven to rotate by the motor 2, thereby driving the two moving blocks 4 to realize reciprocating displacement. The moving block 4 drives the universal joint of the drive shaft assembly to move axially through the measuring frame 8, the turntable 9 and the first fixed component 14 (at this time, the middle shaft of the drive shaft assembly is limited by the second fixed component 22 and cannot move axially). In this process, the second laser rangefinder 20 determines the axial clearance between the middle shaft of the drive shaft assembly and the two universal joints by determining the displacement of the measuring frame 8; At the same time, the reciprocating screw 3 will also drive the hexagonal sleeve 10 to rotate through the hexagonal rod 11 while rotating, so that the hexagonal sleeve 10 can drive the turntable 9 to rotate through the synchronous wheel 12 and the synchronous belt 13 (the first fixed component 14 is rotationally connected to the turntable 9 and is therefore not affected by its rotation). The turntable 9 drives the reverse thrust mechanism and the first laser rangefinder 19 to rotate around the intermediate shaft of the drive shaft assembly through the connecting rod 15, and pushes it during rotation. Once there is a radial gap between the intermediate shaft and the universal joint, the push rod 17 on the reverse thrust mechanism will undergo axial displacement, which will be determined by the first laser rangefinder 19, thereby realizing full-angle radial gap detection of the drive shaft assembly.

[0028] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A clearance detection device for a constant velocity universal joint drive shaft assembly, characterized in that: include: A base box (1), wherein an axial clearance detection component is arranged on the base box (1), and a radial clearance detection component is arranged on the axial clearance detection component; The axial clearance detection component comprises two movable measuring frames (8) and a turntable (9) rotatably mounted on the measuring frames (8); a first fixing component (14) for fixing the universal joint of the drive shaft assembly is rotatably arranged on the turntable (9); a second fixing component (22) for fixing the intermediate shaft of the drive shaft assembly and two second laser rangefinders (20) for detecting the axial displacement of the measuring frames (8) are arranged on the top of the base box (1); the universal joint of the drive shaft assembly is driven to move axially through the first fixing component (14), and the displacement of the measuring frame (8) is determined through the second laser rangefinder (20), thereby detecting the axial clearance of the drive shaft assembly; The radial clearance detection assembly comprises a connecting rod (15) fixedly mounted on a rotating disk (9), the connecting rod (15) being provided with a reverse thrust mechanism for pushing against an intermediate shaft of a drive shaft assembly, the reverse thrust mechanism being provided with a first laser rangefinder (19) for detecting the displacement of the reverse thrust mechanism, so that the rotating disk (9) can drive the reverse thrust assembly and the first laser rangefinder (19) to rotate around the intermediate shaft of the drive shaft assembly, thereby performing all-round radial clearance detection on the drive shaft assembly in a reverse thrust manner.

2. The clearance detection device for a constant velocity joint drive shaft assembly according to claim 1, characterized in that: A reciprocating displacement assembly is arranged in the base box (1), and the reciprocating displacement assembly comprises a reciprocating screw (3) rotatably mounted in the base box (1) and a motor (2) for driving the reciprocating screw (3), the reciprocating screw (3) being transmission-connected to a turntable (9), two moving blocks (4) being threadedly sleeved on the reciprocating screw (3), and both moving blocks (4) being connected to a weighing frame (8).

3. The clearance detection device for a constant velocity joint drive shaft assembly according to claim 2, characterized in that: The movable block (4) is provided with a redundant mechanism, the redundant mechanism comprising two slide bars (5) arranged on both sides of the movable block (4), the two slide bars (5) being provided with a same movable frame (6) and four first springs (7) on a sliding sleeve, the base of the measuring frame (8) being fixedly connected to the movable frame (6), so that when the movable block (4) detects the axial clearance of the drive shaft assembly through the axial clearance detection component, it will not cause excessive pushing and pulling of the universal joint, thereby better adapting to the drive shaft assembly with different axial clearances.

4. The clearance detection device for a constant velocity joint drive shaft assembly according to claim 3, characterized in that: A connecting frame is provided on one side of the movable frame (6), a hexagonal shaft sleeve (10) is rotatably mounted on the connecting frame, a hexagonal rod (11) fixedly connected to the reciprocating screw (3) is slidably mounted in the hexagonal shaft sleeve (10), synchronous wheels (12) are provided on the hexagonal shaft sleeve (10) and the rotating disk (9), and synchronous belts (13) are sleeved on the two pairs of synchronous wheels (12), so that the reciprocating screw (3) can drive the synchronous wheels (12) to rotate, and at the same time, the synchronous wheels (12) can move synchronously with the movable frame (6).

5. The clearance detection device for a constant velocity joint drive shaft assembly according to claim 1, characterized in that: The reverse thrust mechanism comprises a sleeve (16), the first laser rangefinder (19) is fixedly connected to the sleeve (16), a push rod (17) and a second spring (18) for pushing the push rod (17) are slidably mounted in the sleeve (16), the top end of the push rod (17) corresponds to the first laser rangefinder (19), when the bottom end of the push rod (17) contacts the intermediate shaft of the drive shaft assembly, the intermediate shaft is pushed, and the radial clearance of the drive shaft assembly is determined by the axial movement distance of the push rod (17).

6. The clearance detection device for a constant velocity joint drive shaft assembly according to claim 5, characterized in that: A roller is provided at the bottom end of the push rod (17), so that when the push rod (17) rotates around the intermediate shaft of the drive shaft assembly, it will not cause wear to the intermediate shaft.

7. The clearance detection device for a constant velocity joint drive shaft assembly according to claim 1, characterized in that: The connecting rod (15) is composed of a sleeve and a telescopic rod, and the telescopic rod is provided with two upper and lower abutment blocks, both of which extend outside the sleeve and are slidably connected to the sleeve. Two third springs are limitedly sleeved on the sleeve, and the two third springs are located on both sides of the two abutment blocks, so that when the axial clearance of the drive shaft assembly is detected, the connecting rod (15) will adaptively expand and contract without causing the reverse thrust assembly to move axially.

8. The clearance detection device for a constant velocity joint drive shaft assembly according to claim 1, characterized in that: An articulated frame (21) is provided at the bottom of the second fixed component (22), the articulated frame (21) comprising a base, and a telescopic frame hingedly mounted on the base and hingedly connected to the bottom of the second fixed component (22), so that the second fixed component (22) can restrict the axial movement of the intermediate shaft of the drive shaft assembly while not restricting its radial movement.

9. The clearance detection device for a constant velocity joint drive shaft assembly according to claim 1, characterized in that: The first fixing assembly (14) and the second fixing assembly (22) are both composed of a limiting block provided with a limiting groove and a clamping block slidably mounted in the limiting groove, and a hydraulic rod for driving the clamping block to rise and fall is provided at the bottom of the limiting block.

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