Machining and positioning device for front cylinder body of hydraulic breaking hammer

Abstract

The invention discloses a processing and positioning device for a front cylinder body of a hydraulic breaking hammer. The processing and positioning device comprises a positioning platform and a positioning mechanism arranged on the positioning platform, the positioning mechanism comprises a moving seat, a positioning block and a pressing plate; two moving seats are horizontally and movably arranged at the upper end of the positioning platform in a spaced mode, and two positioning blocks capable of moving in the respective length direction are vertically arranged on the adjacent faces of the two moving seats correspondingly so as to adjust the positions of the two positioning blocks on the two moving seats correspondingly; according to the hydraulic breaking hammer front cylinder clamping and fixing device, the two positioning blocks are horizontally connected to the upper portions of the two positioning blocks so that the two positioning blocks can abut against the interiors of side wall grooves of the hydraulic breaking hammer front cylinder correspondingly, and a pressing plate capable of ascending and descending in the vertical direction is horizontally connected to the upper portions of the two positioning blocks. The hydraulic breaking hammer front cylinder clamping and fixing device can be suitable for clamping and fixing hydraulic breaking hammer front cylinders of different sizes through the positioning mechanism, and practicability is improved; the positioning mechanism clamps and fixes the outside of the front cylinder body of the hydraulic breaking hammer, so that the problem that the grinding effect is affected due to the fact that an inner hole is blocked by a part of the positioning mechanism is solved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic breaker front cylinder processing, and in particular to a hydraulic breaker front cylinder processing positioning device. Background Art

[0002] like Figure 6 As shown, hydraulic breaker is referred to as "breaker" or "breaker". The power source of hydraulic breaker is the pressure provided by excavator, loader or pump station. It can more effectively break stones and rocks in engineering construction and improve work efficiency. The principle of selecting hydraulic breaker is to select the most suitable hydraulic breaker according to the excavator model and the working environment. The inner hole of the front cylinder of the hydraulic breaker needs to be installed with the tail of the drill rod. There is usually a bushing between the tail of the drill rod and the inner hole of the front cylinder of the hydraulic breaker to ensure the fit. The matching accuracy of the bushing and the tail of the drill rod depends on the matching accuracy of the bushing and the front cylinder of the hydraulic breaker. Therefore, the surface accuracy of the inner hole of the front cylinder of the hydraulic breaker is required to be high. The inner hole of the front cylinder of the hydraulic breaker is used to install it at the end of the excavator. Its inner hole needs to be ground during the processing operation to obtain a higher precision inner hole, which makes it more stable after installation.

[0003] The existing positioning device uses a positioning core that matches the inner hole size of the front cylinder of the hydraulic breaker for positioning. The positioning core needs to be replaced according to different types of front cylinders of hydraulic breaker hammers. The positioning is relatively complicated, and the positioning core will block the inner hole, making the grinding operation inconvenient.

[0004] Therefore, it is an urgent problem to be solved by the present invention to provide a hydraulic breaker front cylinder processing positioning device which can be used to clamp and fix the front cylinder bodies of hydraulic breaker hammers of different sizes through a positioning mechanism during use, thereby improving its practicability, and the positioning mechanism clamps and fixes the outside of the hydraulic breaker front cylinder body to avoid the problem that its inner hole is blocked by the parts of the positioning mechanism and affects the grinding effect. Summary of the invention

[0005] In view of the above technical problems, the purpose of the present invention is to overcome the problem that the prior art uses a positioning core that is compatible with the inner hole size of the hydraulic breaker front cylinder body for positioning, the positioning core needs to be replaced according to different models of hydraulic breaker front cylinder bodies, the positioning is relatively cumbersome, and the use of the positioning core will block the inner hole, making it inconvenient for grinding operations. Thus, a hydraulic breaker front cylinder body processing and positioning device is provided, which can be used to clamp and fix hydraulic breaker front cylinder bodies of different sizes through a positioning mechanism during use, thereby improving its practicality. The positioning mechanism clamps and fixes the outside of the hydraulic breaker front cylinder body to avoid the problem that the inner hole is blocked by components of the positioning mechanism and affects the grinding effect.

[0006] In order to achieve the above-mentioned object, the present invention provides a hydraulic breaker front cylinder machining positioning device, the device comprising: a positioning platform and a positioning mechanism arranged on the positioning platform;

[0007] The positioning mechanism comprises: a moving seat, a positioning block and a pressing plate; wherein,

[0008] The upper end of the positioning platform is provided with two moving seats close to each other, which are spaced apart and horizontally movably arranged. The adjacent surfaces of the two moving seats are respectively vertically provided with two positioning blocks which can move in their respective length directions and have isosceles trapezoidal cross-sections, so as to adjust the positions of the two positioning blocks on the two moving seats respectively, so that the two positioning blocks can respectively abut against the side wall grooves of the front cylinder body of the hydraulic breaker. The heights of the two positioning blocks are lower than the height of the front cylinder body of the hydraulic breaker, and a pressure plate which can be lifted and lowered in the vertical direction to abut against the front cylinder body of the hydraulic breaker is horizontally connected above the two positioning blocks.

[0009] Preferably, a row of vacuum suction cups capable of being adsorbed on the front cylinder of the hydraulic breaker are horizontally fixedly arranged at intervals and equal intervals below the pressure plate, and a vacuum generator is also fixedly arranged on the upper end of the pressure plate, and the vacuum generator is connected to each of the vacuum suction cups through an air line.

[0010] Preferably, the device further comprises a driving mechanism for driving the two movable seats to move horizontally on the positioning platform so as to move the two seats closer to or farther from each other, wherein the driving mechanism comprises: a roller, a gear, a hinge plate and a fixed block; wherein,

[0011] The interior of the positioning platform is a hollow structure, and two guide grooves communicating with the interior are arranged at intervals and vertically penetrated at the upper end of the positioning platform facing each of the moving seats, and a guide rod is fixedly arranged horizontally inside each of the guide grooves, and a fixed block for assembling the moving seat is horizontally and slidably arranged on each of the guide rods, and the top of each of the fixed blocks is fixed on the moving seat, and two rollers are arranged at intervals and horizontally rotatably inside, and each roller is hingedly provided with hinged plates at intervals and hingedly provided, and the two hinged plates on each of the rollers are respectively hinged to the corresponding two fixed blocks, and gears meshing with each other are coaxially fixed on the ends of the same ends of the two rollers.

[0012] Preferably, a driving motor for driving any one of the rollers to rotate is horizontally fixedly arranged on the positioning platform, and the output shaft of the driving motor is coaxially connected to the roller via a coupling.

[0013] Preferably, the device further comprises a power mechanism for driving the positioning block on each of the moving seats to move along its length direction, the power mechanism comprising: a screw rod, a slider and a power motor; wherein,

[0014] The interior of each of the movable seats is a hollow structure, and a screw is horizontally and rotatably arranged inside the seat, a slider is threadedly connected to the screw, and the upper part of the positioning platform facing the front cylinder of the hydraulic breaker is recessed inward to form an avoidance groove connected to the interior thereof, and the slider portion extends from the avoidance groove and is fixed on the positioning block, and a power motor is horizontally fixedly arranged at the end of each of the movable seats, and the power motor is coaxially connected to the screw through a coupling.

[0015] Preferably, the device further comprises a lifting mechanism for driving the pressing plate to lift in a vertical direction, wherein the lifting mechanism comprises: an electric telescopic rod, a screw rod and a nut; wherein:

[0016] Both ends of the pressure plate are respectively vertically penetrated by strip holes for matching with the screw rods, and the interior of each of the positioning blocks is a hollow structure, and an electric telescopic rod is vertically fixedly arranged inside each of the positioning blocks, a support plate is fixedly arranged on the upper end of the electric telescopic rod, and each of the support plates is vertically fixed with a nut that can extend from the top of the positioning block and pass through the strip hole to the top of the pressure plate, and the screw rods located at the upper and lower ends of the pressure plate are respectively threadedly fixed with nuts that can lean against the pressure plate.

[0017] According to the above technical solution, the beneficial effects of the hydraulic breaker front cylinder processing and positioning device provided by the present invention when used are as follows:

[0018] Place the front cylinder of the hydraulic breaker to be processed horizontally on the positioning platform between the two moving seats, and then adjust the positions of the two positioning blocks on the two moving seats so that the two positioning blocks are directly opposite to the grooves on both sides of the front cylinder of the hydraulic breaker, so as to clamp and fix the front cylinder of the hydraulic breaker, so as to limit it in the horizontal direction to prevent it from shifting in the horizontal direction during its processing. When the two positioning blocks are clamped in the grooves on both sides of the front cylinder of the hydraulic breaker, the pressure plate arranged above the two positioning blocks is driven to descend in the vertical direction until it abuts against the front cylinder of the hydraulic breaker, thereby limiting it in the longitudinal direction to prevent the front cylinder of the hydraulic breaker from moving in the longitudinal direction during the processing.

[0019] In summary, the present invention can be used to clamp and fix the front cylinder bodies of hydraulic breakers of different sizes through the positioning mechanism, thereby improving its practicability. The positioning mechanism clamps and fixes the outside of the front cylinder body of the hydraulic breaker to avoid the problem that its inner hole is blocked by the components of the positioning mechanism and affects the grinding effect.

[0020] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation mode; and the parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a structural schematic diagram of a hydraulic breaker front cylinder body machining and positioning device provided in a preferred embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of a hydraulic breaker front cylinder body processing and positioning device provided in a preferred embodiment of the present invention at a certain moment during the working process;

[0024] Figure 3 yes Figure 2 Structural cross-sectional view of

[0025] Figure 4 yes Figure 2 A top view of the structure;

[0026] Figure 5 It is a structural schematic diagram of a driving mechanism of a hydraulic breaker front cylinder machining and positioning device provided in a preferred embodiment of the present invention;

[0027] Figure 6 It is a structural schematic diagram of a front cylinder body of a hydraulic breaker in the prior art.

[0028] Description of Reference Numerals

[0029] 1. Positioning platform; 2. Moving seat; 3. Positioning block; 4. Pressing plate; 5. Vacuum suction cup; 601. Roller; 602. Gear; 603. Hinge plate; 604. Fixed block; 7. Guide groove; 8. Guide rod; 9. Electric telescopic rod; 10. Vacuum generator; 11. Screw; 12. Strip hole; 13. Power mechanism; 14. Nut. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0031] like Figure 1-6 As shown, the present invention provides a hydraulic breaker front cylinder machining positioning device, the device comprising: a positioning platform 1 and a positioning mechanism arranged on the positioning platform 1;

[0032] The positioning mechanism comprises: a moving seat 2, a positioning block 3 and a pressing plate 4; wherein,

[0033] The upper end of the positioning platform 1 is provided with two movable seats 2 close to each other, which are spaced apart and horizontally movably arranged. The adjacent surfaces of the two movable seats 2 are respectively vertically provided with two positioning blocks 3 which can move in their respective length directions and have isosceles trapezoidal cross-sections, so as to adjust the positions of the two positioning blocks 3 on the two movable seats 2 respectively, so that the two positioning blocks 3 can respectively abut against the side wall grooves of the front cylinder body of the hydraulic breaker. The heights of the two positioning blocks 3 are lower than the height of the front cylinder body of the hydraulic breaker, and a pressure plate 4 which can be lifted and lowered in the vertical direction to abut against the front cylinder body of the hydraulic breaker is horizontally connected above the two positioning blocks 3.

[0034] In the above scheme, when in use, the front cylinder body of the hydraulic breaker hammer to be processed is horizontally placed on the positioning platform 1 located between the two moving seats 2, and then the positions of the two positioning blocks 3 on the two moving seats 2 are adjusted so that the two positioning blocks 3 are directly opposite to the grooves on both sides of the front cylinder body of the hydraulic breaker hammer, so as to clamp and fix the front cylinder body of the hydraulic breaker hammer, so as to limit it in the horizontal direction to prevent it from being offset in the horizontal direction during its processing. When the two positioning blocks 3 are clamped in the grooves on both sides of the front cylinder body of the hydraulic breaker hammer, the pressure plate 4 arranged above the two positioning blocks 3 is driven to descend in the vertical direction until it abuts against the front cylinder body of the hydraulic breaker hammer, thereby limiting it in the longitudinal direction to prevent the front cylinder body of the hydraulic breaker hammer from moving in the longitudinal direction during the processing.

[0035] In summary, since the positions of the movable seat 2, the positioning block 3 and the pressure plate 4 of the positioning mechanism all have adjustment functions, they can be used to clamp and fix the front cylinder bodies of hydraulic breakers of different sizes, thereby improving its practicality. The positioning mechanism clamps and fixes the outside of the front cylinder body of the hydraulic breaker to avoid the problem that its inner hole is blocked by the components of the positioning mechanism and affects the grinding effect.

[0036] In a preferred embodiment of the present invention, a row of vacuum suction cups 5 capable of being adsorbed on the front cylinder body of the hydraulic breaker are horizontally fixedly arranged at intervals and equal intervals below the pressure plate 4, and a vacuum generator 10 is also fixedly arranged on the upper end of the pressure plate 4, and the vacuum generator 10 is connected to each of the vacuum suction cups 5 through an air line.

[0037] In the above solution, a row of vacuum suction cups 5 can enable the pressing plate 4 to be firmly adsorbed on the front cylinder of the hydraulic breaker, thereby improving the stability and reliability of its fixation.

[0038] In addition, the vacuum generator 10 is a well-known technical means, which is a new, efficient, clean, economical, and small vacuum component that uses a positive pressure air source to generate negative pressure. This makes it very easy and convenient to obtain negative pressure in places where compressed air is available, or where positive and negative pressures are required at the same time in a pneumatic system.

[0039] Therefore, the vacuum generator 10 is used to generate negative pressure inside a row of vacuum suction cups 5 so that the vacuum cups 5 can be adsorbed on the front cylinder of the hydraulic breaker.

[0040] In a preferred embodiment of the present invention, the device further comprises a driving mechanism for driving the two movable seats 2 to move horizontally on the positioning platform 1 so that the two move closer to or farther from each other, and the driving mechanism comprises: a roller 601, a gear 602, a hinge plate 603 and a fixed block 604; wherein,

[0041] The interior of the positioning platform 1 is a hollow structure, and two guide grooves 7 communicating with the interior are arranged at intervals and vertically penetrated on the upper end of the positioning platform 1 facing each of the moving seats 2, and a guide rod 8 is fixedly arranged horizontally inside each of the guide grooves 7, and a fixed block 604 for assembling the moving seat 2 is horizontally and slidably arranged on each of the guide rods 8, and the top of each of the fixed blocks 604 is fixed on the moving seat 2, and two rollers 601 are arranged at intervals and horizontally rotatably inside, and each of the rollers 601 is hingedly provided with hinged plates 603 at intervals, and the two hinged plates 603 on each of the rollers 601 are respectively hinged on the corresponding two fixed blocks 604, and gears 602 that are meshingly connected to each other are coaxially fixedly arranged on the ends of the same ends of the two rollers 601.

[0042] In the above scheme, when any one of the rollers 601 is driven to rotate, under the meshing action of the two gears, the two rollers 601 rotate in opposite directions to drive the two hinged plates 603 on each of them to pull the corresponding two fixed blocks 604 to drive the two moving seats 2 to move in opposite directions to approach the front cylinder of the hydraulic breaker. Conversely, when the two rollers 601 rotate in the opposite direction to push the two hinged plates 603 on each of them to drive the corresponding two fixed blocks 604 to drive the two moving seats 2 to move in the opposite direction to move away from the front cylinder of the hydraulic breaker.

[0043] In a preferred embodiment of the present invention, a driving motor for driving any one of the rollers 601 to rotate is horizontally fixedly disposed on the positioning platform 1, and the output shaft of the driving motor is coaxially connected to the roller 601 through a coupling.

[0044] In the above scheme, the driving motor can drive the roller 601 connected thereto to rotate, and the two gears 602 meshingly connected at the ends of the two rollers 601 can synchronously drive the two rollers 601 to rotate in opposite directions to drive the two hinged plates 603 on each of them to pull the corresponding two fixed blocks 604 to drive the two moving seats 2 to move in opposite directions to approach the front cylinder of the hydraulic breaker. Conversely, when the two rollers 601 rotate in the opposite direction to push the two hinged plates 603 on each of them to drive the corresponding two fixed blocks 604 to drive the two moving seats 2 to move in the opposite direction to move away from the front cylinder of the hydraulic breaker.

[0045] In a preferred embodiment of the present invention, the device further comprises a power mechanism 13 for driving the positioning block 3 on each of the moving seats 2 to move along its length direction, and the power mechanism 13 comprises: a screw rod, a slider and a power motor; wherein,

[0046] The interior of each of the movable seats 2 is a hollow structure, and a screw is horizontally and rotatably arranged inside, a slider is threadedly connected to the screw, the upper part of the positioning platform 1 facing the front cylinder of the hydraulic breaker is recessed inward to form an avoidance groove connected to the interior, and the slider part extends from the avoidance groove and is fixed on the positioning block 3, and a power motor is horizontally fixed at the end of each of the movable seats 2, and the power motor is coaxially connected to the screw through a coupling.

[0047] In the above scheme, when in use, the power motor is started to drive the screw to rotate so that the slider drives the positioning block 3 to move along the length direction of the moving seat 2 to adjust the position of the positioning block 3 on the moving seat 2 to meet the positioning of the front cylinder of hydraulic breakers of different sizes.

[0048] In a preferred embodiment of the present invention, the device further comprises a lifting mechanism for driving the pressing plate 4 to lift up and down in a vertical direction, wherein the lifting mechanism comprises: an electric telescopic rod 9, a screw rod 11 and a nut 14; wherein,

[0049] Both ends of the pressure plate 4 are respectively vertically penetrated by strip holes 12 for matching with the screw rod 11, and the interior of each of the positioning blocks 3 is a hollow structure, and an electric telescopic rod 9 is vertically fixedly arranged inside each of the positioning blocks 3, and a support plate is fixedly arranged on the upper end of the electric telescopic rod 9, and each of the support plates is vertically fixed with a nut 14 that can extend from the top of the positioning block 3 and pass through the strip hole 12 to the top of the pressure plate 4, and the screw rods 11 located at the upper and lower ends of the pressure plate 4 are respectively threadedly fixed with nuts 14 that can lean against the pressure plate 4.

[0050] In the above solution, when in use, the electric telescopic rod 19 is used to drive the pressing plate 4 to move up and down in the vertical direction, so that the pressing plate 4 can be firmly pressed against the front cylinder of the hydraulic breaker.

[0051] In addition, the electric telescopic rod 9 is a cylinder or a servo electric cylinder, and the servo electric cylinder is a modular product that integrates a servo motor and a lead screw, converting the rotational motion of the servo motor into linear motion, and at the same time converting the best advantages of the servo motor - precise speed control, precise rotation speed control, and precise torque control - into precise speed control, precise position control, and precise thrust control. Cylinders or servo electric cylinders are both existing technologies, so their specific structures and usage principles will not be repeated here.

[0052] In summary, the hydraulic breaker front cylinder processing and positioning device provided by the present invention overcomes the problem that the prior art uses a positioning core that is compatible with the inner hole size of the hydraulic breaker front cylinder for positioning, the positioning core needs to be replaced according to different models of hydraulic breaker front cylinders, the positioning is relatively cumbersome, and the use of the positioning core will block the inner hole, making it inconvenient for grinding operations.

[0053] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0055] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A hydraulic breaker front cylinder machining and positioning device, characterized in that: The device comprises: a positioning platform (1) and a positioning mechanism arranged on the positioning platform (1); The positioning mechanism comprises: a moving seat (2), a positioning block (3) and a pressing plate (4); wherein: The upper end of the positioning platform (1) is provided with two mutually adjacent movable seats (2) spaced apart and horizontally movable, and the adjacent surfaces of the two movable seats (2) are respectively provided with two positioning blocks (3) which can be moved in their respective length directions and have isosceles trapezoidal cross-sections, so as to adjust the positions of the two positioning blocks (3) on the two movable seats (2) so that the two positioning blocks (3) can respectively abut against the side wall grooves of the front cylinder body of the hydraulic breaker, the height of the two positioning blocks (3) is lower than the height of the front cylinder body of the hydraulic breaker, and a pressure plate (4) which can be raised and lowered in the vertical direction to abut against the front cylinder body of the hydraulic breaker is horizontally connected above the two positioning blocks (3).

2. The hydraulic breaker front cylinder machining and positioning device according to claim 1, characterized in that: A row of vacuum suction cups (5) capable of being adsorbed on the front cylinder of the hydraulic breaker are fixedly arranged horizontally at intervals and equal intervals below the pressure plate (4), and a vacuum generator (10) is also fixedly arranged at the upper end of the pressure plate (4), and the vacuum generator (10) is connected to each of the vacuum suction cups (5) through an air line.

3. The hydraulic breaker front cylinder machining and positioning device according to claim 1, characterized in that: The device also includes a driving mechanism for driving the two movable seats (2) to move horizontally on the positioning platform (1) so that the two seats are closer to or farther from each other, and the driving mechanism includes: a roller (601), a gear (602), a hinge plate (603) and a fixed block (604); wherein: The interior of the positioning platform (1) is a hollow structure. Two guide grooves (7) communicating with the interior of the positioning platform (1) are arranged at intervals and vertically penetrate the upper end of the positioning platform (1) facing each of the moving seats (2). A guide rod (8) is fixedly arranged horizontally inside each of the guide grooves (7). A fixed block (604) for assembling the moving seat (2) is horizontally and slidably arranged on each of the guide rods (8). The top of each of the fixed blocks (604) is fixed on the moving seat (2). Two rollers (601) are arranged at intervals and horizontally rotatably inside the positioning platform (1). Each of the rollers (601) is hingedly arranged with hinge plates (603) at intervals. The two hinge plates (603) on each of the rollers (601) are respectively hingedly connected to the corresponding two fixed blocks (604). Gears (602) that are meshed and connected to each other are coaxially fixedly arranged on the ends of the same ends of the two rollers (601).

4. The hydraulic breaker front cylinder machining and positioning device according to claim 3, characterized in that: A driving motor for driving any one of the rollers (601) to rotate is horizontally fixedly arranged on the positioning platform (1), and the output shaft of the driving motor is coaxially connected to the roller (601) via a coupling.

5. The hydraulic breaker front cylinder machining and positioning device according to claim 1, characterized in that: The device also includes a power mechanism (13) for driving the positioning block (3) on each of the movable seats (2) to move along its length direction, and the power mechanism (13) includes: a screw rod, a slider and a power motor; wherein: The interior of each movable seat (2) is a hollow structure, and a screw is horizontally and rotatably arranged inside the seat, a slider is threadedly connected to the screw, and the upper part of the positioning platform (1) facing the front cylinder of the hydraulic breaker is recessed inward to form an avoidance groove connected to the interior thereof, and the slider part extends from the avoidance groove and is fixed on the positioning block (3), and a power motor is horizontally fixedly arranged at the end of each movable seat (2), and the power motor is coaxially connected to the screw through a coupling.

6. The hydraulic breaker front cylinder machining and positioning device according to claim 1, characterized in that: The device also includes a lifting mechanism for driving the pressing plate (4) to lift and lower in a vertical direction, the lifting mechanism comprising: an electric telescopic rod (9), a screw rod (11) and a nut (14); wherein: The two ends of the pressing plate (4) are respectively vertically penetrated with strip holes (12) for matching with the screw rod (11), and the interior of each of the positioning blocks (3) is a hollow structure, and an electric telescopic rod (9) is vertically fixedly arranged inside each of the positioning blocks (3), and a support plate is fixedly arranged on the upper end of the electric telescopic rod (9), and each of the support plates is vertically fixed with a nut (14) that can extend from the top of the positioning block (3) and pass through the strip hole (12) to the top of the pressing plate (4), and the screw rods (11) located at the upper and lower ends of the pressing plate (4) are respectively threadedly fixed with nuts (14) that can lean against the pressing plate (4).

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