Pipe bending boosting mechanism of pipe bending machine

Abstract

The utility model relates to the field of pipe bending machines, in particular to a pipe bending boosting mechanism of a pipe bending machine, which comprises a pipe bending mechanism, a pushing mechanism and a pushing mechanism, the two first sliding grooves are formed in the two sides of the bottom wall of the workbench correspondingly; the second sliding grooves are formed in the table top of the workbench at equal intervals. The pipe bending unit is fixed at one end of the workbench; the boosting clamping mechanism is fixed on the workbench and can be used for boosting the pipe fitting; and the multiple limiting mechanisms are fixed to the table top of the workbench at equal intervals, and the limiting mechanisms can limit the pipe fittings during boosting. According to the utility model, a plurality of limiting mechanisms are arranged on a boosting route, so that unexpected bending deformation can be effectively avoided, the working stability is effectively improved, a pipe fitting is enabled to better meet the standard, and the sliding frame I and the sliding frame II are connected in an inserting manner, so that one end of the square rod II can be effectively stabilized, and invalid limiting caused by shaking in the boosting process is prevented; and the limiting stability is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pipe bender, specifically a pipe bending boosting mechanism of pipe bender. BACKGROUND

[0002] In the field of modern industrial manufacturing, pipe bending process is widely used in many industries, such as automobile manufacturing, aerospace, construction engineering and petroleum chemical industry, and plays an indispensable role in the construction and forming of various pipeline systems. As the key equipment to realize pipe bending process, the performance of pipe bending machine directly affects the quality and production efficiency of pipe bending.

[0003] In the working process of pipe bending machine, the pipe bending boosting mechanism plays an extremely important role. Usually, the pipe bending machine only fixes one end of the pipe and limits the position near the bending pipe. This traditional operation mode can successfully complete the pipe bending task when facing short or rigid pipe, but when dealing with long and thin pipe, some problems will occur. When a long and thin metal pipe is bent, the force will be transmitted along the axial direction of the pipe under the action of boosting force. Because the length-to-diameter ratio of the slender pipe is large, it is difficult for itself to effectively resist the transmitted thrust, so that additional bending deformation is easily generated in the area that is not fixed and limited. This unexpected bending deformation not only destroys the original shape and precision requirements of the pipe, but also may cause a series of problems such as stress concentration and increased fluid resistance in the subsequent use of the pipe, which seriously affects the performance and service life of the pipe. SUMMARY

[0004] The utility model aims at providing a pipe bending boosting mechanism of pipe bender to solve the problems in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A pipe bending boosting mechanism of pipe bender, comprising:

[0007] The pipe bending mechanism comprises a workbench;

[0008] The pipe bending unit is fixed at one end of the workbench;

[0009] Further comprising:

[0010] The sliding chute one is provided with two, which are respectively arranged on the two sides of the bottom wall of the workbench;

[0011] The sliding chute two is provided with a plurality of, which are arranged on the workbench table surface at equal intervals;

[0012] The square hole one is provided with a plurality of square holes which are equidistantly arranged on the workbench top and communicated with the inner part of the second sliding groove;

[0013] The square hole two is arranged on the workbench top and located at the second sliding groove;

[0014] The boosting clamping mechanism is fixed on the workbench and can boost the pipe;

[0015] The limiting mechanism is provided with a plurality of limiting mechanisms which are equidistantly arranged on the workbench top and can limit the pipe during boosting.

[0016] Further, the boosting clamping mechanism comprises:

[0017] The linear motor is fixed with the bottom wall of the workbench, and the sliding table of the linear motor is fixedly connected with the shell;

[0018] The third sliding groove is provided with four third sliding grooves which are equiangularly arranged in the inner part of the shell, and the third sliding groove is slidably connected with the first block;

[0019] The circular rod is fixed on the outer wall of the first block.

[0020] Preferably, the boosting clamping mechanism comprises:

[0021] The motor is fixed on the inner wall of one end of the shell, and the rotating shaft of the motor is fixedly connected with the threaded rod;

[0022] The circular frame is screwed on the outer wall of the threaded rod, and the circular frame is slidably connected with the inner wall of the shell;

[0023] The second block is provided with four groups of second blocks which are equiangularly fixed on the outer wall of the circular frame, the outer wall of the second block is provided with an arc-shaped hole, and the arc-shaped hole is slidably connected with the circular rod.

[0024] Preferably, the boosting clamping mechanism comprises:

[0025] The L-shaped frame is provided with two L-shaped frames which are respectively fixed on both sides of the sliding table of the linear motor, the outer wall of the L-shaped frame is fixedly connected with the first square rod, and the outer wall of the first square rod is slidably connected with the inner part of the first sliding groove.

[0026] Preferably, the limiting mechanism comprises:

[0027] The first trapezoidal frame is slidably connected with the inner part of the second sliding groove, the outer wall of the first trapezoidal frame is equidistantly provided with a square groove, the outer wall of the first trapezoidal frame is fixedly connected with the second square rod, and the outer wall of the first trapezoidal frame is fixedly connected with the first spring between the inner wall of the first square hole.

[0028] The rotating seat is fixed on the outer wall of the second square rod, and the rotating seat is rotatably connected with the rubber wheel.

[0029] Preferably, the limiting mechanism comprises:

[0030] The first slide is fixed to one end of several square rods two;

[0031] The second slide is fixed to the other end of several square rods two and opposite to the first slide.

[0032] Preferably, the limiting mechanism comprises:

[0033] The square shell is fixed with the workbench top, the U-shaped frame is slidably inserted into the square shell, the spring two is fixedly connected between the outer wall of the U-shaped frame and the inner wall of the square shell, the trapezoidal frame two is fixedly connected to one end of the U-shaped frame, the square hole three is formed in the outer wall of the trapezoidal frame two at the center, and the trapezoidal frame two is slidably inserted into the square hole one.

[0034] The square plate is provided with two square plates which are fixed to the two sides of one end of the U-shaped frame, the square plate is inserted into the square groove, and the outer wall of the square plate is slidably inserted into the square hole two.

[0035] Compared with the prior art, the utility model has the advantages that:

[0036] 1. The boost clamping mechanism can quickly clamp one end of the pipe, and can adapt to pipe of different sizes, effectively improving the versatility, and the rubber pad is arranged on the outer wall of the block one in contact with the pipe, effectively avoiding hard contact and damaging the pipe.

[0037] 2. The limiting mechanism is arranged on the boost route, which can effectively avoid unexpected bending deformation, effectively improve the working stability, make the pipe more meet the standard, and the slide one and the slide two are inserted, which can effectively stabilize the one end of the square rod two and prevent shaking during boosting, resulting in invalid limiting, and effectively improving the limiting stability.

[0038] 3. The square rod one first contacts the trapezoidal frame two, the square plate is separated from the corresponding square groove, the trapezoidal frame one is released, the shell contacts the trapezoidal frame one again, the trapezoidal frame one moves away from the shell, the limiting mechanism does not block the movement of the shell when the shell moves, and the limiting mechanism can quickly limit the pipe when the shell drives the pipe back, effectively improving the mechanical linkage and flexibility, limiting the pipe, and moving without affecting the work of the boost clamping mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is the overall structure schematic view of the utility model;

[0040] Figure 2 It is the partial structure schematic view of the workbench bottom in the utility model;

[0041] Figure 3 It is the shell cross section structure schematic view in the utility model;

[0042] Figure 4 is the local structure schematic view of the workbench in the utility model, and

[0043] Figure 5 is the local structure schematic view of the workbench in the utility model, and

[0044] Figure 6 is the local structure schematic view of the workbench in the utility model, and

[0045] In the figure: 100, bending pipe mechanism;110, workbench;111, sliding groove one;112, sliding groove two;113, square hole one;114, square hole two;120, bending pipe unit;200, boost clamping mechanism;210, linear motor;220, shell;221, sliding groove three;222, square one;223, round frame;224, motor;225, threaded rod;226, square two;227, round rod;228, arc hole;230, L-shaped frame;231, square rod one;300, limiting mechanism;310, trapezoidal frame one;311, square groove;312, square rod two;313, sliding frame one;314, rotating seat;315, rubber wheel;316, spring one;317, sliding frame two;320, square shell;321, spring two;322, trapezoidal frame two;323, square hole three;324, U-shaped frame;325, square plate. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0047] Please refer to Figures 1-6The utility model embodiment, a kind of pipe bending boosting mechanism of pipe bender, including pipe bending mechanism 100, pipe bending mechanism 100 includes workbench 110 and following several parts: its pipe bending unit 120 is fixed at the one end of workbench 110, and chute one 111 is provided with two, respectively open in the bottom wall both sides of workbench 110, and chute two 112 is provided with several, equal interval is opened on the table top of workbench 110, its square hole one 113 is provided with several, equal interval is opened on the table top of workbench 110, and square hole one 113 inside and chute two 112 inside are communicated, and square hole two 114 is opened on the table top of workbench 110 at chute two 112, its boosting clamping mechanism 200 is fixed on workbench 110, can boost to pipe fitting, and spacing mechanism 300 is provided with several, equal interval is fixed on the table top of workbench 110, can be positioned to pipe fitting when boosting, boosting clamping mechanism 200 includes following several parts: its linear motor 210 is fixed with the bottom wall of workbench 110, sliding table fixedly connected with shell 220 in linear motor 210, and chute three 221 is provided with four, equal angle is opened in the inside of shell 220, and square block one 222 is slidably inserted in the inside of chute three 221, its round rod 227 is fixed on the outer wall of square block one 222, motor 224 is fixed on the inner wall of shell 220 one end, and threaded rod 225 is fixedly connected on the shaft of motor 224, its round frame 223 is screwed on the outer wall of threaded rod 225, and round frame 223 is slidably inserted with the inner wall of shell 220, its square block two 226 is provided with four groups, equal angle is fixed on the outer wall of round frame 223, arc hole 228 is opened on the outer wall of square block two 226, and arc hole 228 is slidably inserted with round rod 227, the one end of pipe fitting can be quickly clamped by boosting clamping mechanism 200, and it can adapt to pipe fitting of different sizes, effectively improve versatility.

[0048] The limiting mechanism 300 comprises the following parts: the trapezoidal frame one 310 is slidably inserted into the sliding groove two 112, square grooves 311 are equidistantly arranged on the outer wall of the trapezoidal frame one 310, square rods two 312 are fixedly connected to the outer wall of the trapezoidal frame one 310, springs one 316 are fixedly connected between the outer wall of the trapezoidal frame one 310 and the inner wall of the square hole one 113, the rotating seat 314 is fixed to the outer wall of the square rod two 312, the rubber wheel 315 is rotatably connected to the rotating seat 314, the sliding frame one 313 is fixed to one end of the square rod two 312, the sliding frame two 317 is fixed to the other end of the square rod two 312 and is opposite to the sliding frame one 313, the square shell 320 is fixed to the table top of the workbench 110, the U-shaped frame 324 is slidably inserted into the square shell 320, springs two 321 are fixedly connected between the outer wall of the U-shaped frame 324 and the inner wall of the square shell 320, the trapezoidal frame two 322 is fixedly connected to one end of the U-shaped frame 324, the square hole three 323 is arranged on the outer wall of the trapezoidal frame two 322 at the center, the trapezoidal frame two 322 is slidably inserted into the square hole one 113, the square plates 325 are arranged in two and are fixed to the two sides of one end of the U-shaped frame 324, the square plates 325 are inserted into the square grooves 311, the square plates 325 are slidably inserted into the square hole two 114, a plurality of limiting mechanisms 300 are arranged on the boosting route, unintended bending deformation can be effectively avoided, and the working stability is effectively improved.

[0049] The boosting clamping mechanism 200 comprises the following parts: the L-shaped frames 230 are arranged in two and are fixed to the two sides of the sliding table of the linear motor 210, the square rods one 231 are fixedly connected to the outer wall of the L-shaped frames 230, the square rods one 231 are slidably inserted into the sliding groove one 111, the square plates 325 are separated from the corresponding square grooves 311 by the contact between the square rods one 231 and the trapezoidal frame two 322, the trapezoidal frame one 310 is released, the shell 220 contacts the trapezoidal frame one 310, the trapezoidal frame one 310 moves away from the shell 220, the limiting mechanism 300 does not block the movement of the shell 220 when the shell 220 moves, the limiting mechanism 300 can quickly limit the pipe when the shell 220 drives the pipe to return, and the mechanical linkage and flexibility are effectively improved.

[0050] Specifically, during work, the pipe is placed on the support frame of the workbench 110, one end is placed inside the shell 220, the motor 224 drives the threaded rod 225 to rotate and screw with the round frame 223, drives the round frame 223 and the block two 226 to move to the direction of the block one 222, the round rod 227 slides in the arc-shaped hole 228, and the block one 222 slides into the shell 220 to tightly adhere to the pipe, the pipe is clamped, a plurality of limiting mechanisms 300 are used to limit the pipe, the pipe passes between two opposite rubber wheels 315, during work, the linear motor 210 drives the clamped pipe to move to the elbow pipe unit 120, when the shell 220 is about to contact the limiting mechanism 300, the square rod one 231 slides along the sliding groove one 111, first contacts the corresponding trapezoidal frame two 322, the trapezoidal frame two 322 is pressed upward by the square rod one 231, at this time, the square plate 325 is separated from the square groove 311, and the limiting of the trapezoidal frame one 310 is released, when the shell 220 contacts the trapezoidal frame one 310, the trapezoidal frame one 310 is pressed to slide into the sliding groove two 112 to be away from the moving range of the shell 220, so that the limiting mechanism 300 is avoided by the shell 220, when the shell 220 drives the pipe to move back, after the shell 220 is separated from the trapezoidal frame one 310, the trapezoidal frame one 310 is extended outward to tightly adhere to the outer wall of the pipe by the rebound of the spring one 316, at this time, with the shell 220 away, the square rod one 231 is separated from the trapezoidal frame two 322, and the square plate 325 is inserted into the corresponding square groove 311 by the rebound of the spring two 321, so as to limit the rubber wheel 315.

[0051] Embodiment one

[0052] As shown in Figure 1 and Figure 3 In this embodiment, the boosting clamping mechanism 200 includes the following parts: the linear motor 210 is fixed to the bottom wall of the workbench 110, the slide table of the linear motor 210 is fixedly connected with the shell 220, the sliding groove three 221 is arranged inside the shell 220 and is arranged at equal angles, the block one 222 is slidably inserted into the sliding groove three 221, the round rod 227 is fixed to the outer wall of the block one 222, the motor 224 is fixed to the inner wall of one end of the shell 220, the threaded rod 225 is fixedly connected to the rotating shaft of the motor 224, the round frame 223 is screwed on the outer wall of the threaded rod 225, the round frame 223 is slidably inserted into the inner wall of the shell 220, the block two 226 is arranged in four groups and is fixed to the outer wall of the round frame 223 at equal angles, the arc-shaped hole 228 is arranged on the outer wall of the block two 226 and is slidably inserted into the round rod 227.

[0053] In the embodiment, the pipe is placed on the support frame of the workbench 110, one end is placed inside the shell 220, the motor 224 drives the threaded rod 225 to rotate and screw with the round frame 223, drives the round frame 223 and the block two 226 to move to the block one 222 direction, the round rod 227 slides in the arc-shaped hole 228, the block one 222 slides into the shell 220 to tightly adhere to the pipe, the pipe one end is clamped, the boost clamping mechanism 200 can quickly clamp the pipe one end, and can adapt to pipes of different sizes, effectively improving the versatility, the outer wall of the block one 222 in contact with the pipe is provided with a rubber pad, effectively avoiding hard contact and damaging the pipe.

[0054] As shown in Figures 5-6 In the embodiment, the limiting mechanism 300 includes the following parts: the trapezoidal frame one 310 is slidably inserted into the sliding chute two 112, the square grooves 311 are evenly arranged on the outer wall of the trapezoidal frame one 310, the square rods two 312 are fixedly connected to the outer wall of the trapezoidal frame one 310, the spring one 316 is fixedly connected between the outer wall of the trapezoidal frame one 310 and the inner wall of the square hole one 113, the rotating seat 314 is fixed to the outer wall of the square rod two 312, the rubber wheel 315 is rotatably connected to the rotating seat 314, the sliding frame one 313 is fixed to one end of some of the square rods two 312, the sliding frame two 317 is fixed to one end of the other square rods two 312, and is opposite to the sliding frame one 313, the square shell 320 is fixed to the table top of the workbench 110, the U-shaped frame 324 is slidably inserted into the square shell 320, the spring two 321 is fixedly connected between the outer wall of the U-shaped frame 324 and the inner wall of the square shell 320, one end of the U-shaped frame 324 is fixedly connected with the trapezoidal frame two 322, the square hole three 323 is arranged on the outer wall of the trapezoidal frame two 322 at the center, and the trapezoidal frame two 322 is slidably inserted into the square hole one 113, the square plates 325 are arranged in two, and are fixed to the two sides of one end of the U-shaped frame 324, and the square plates 325 are inserted into the square grooves 311 in cooperation, and the outer wall of the square plate 325 is slidably inserted into the square hole two 114.

[0055] In specific implementation, the pipe is limited by the limiting mechanism 300, the pipe passes between the two opposite rubber wheels 315, the limiting mechanism 300 can limit pipes of different sizes, when the trapezoidal frame one 310 rebounds, the rubber wheel 315 tightly adheres to the outer wall of the pipe, the square plate 325 is inserted into the corresponding position of the square groove 311 to limit the current position of the trapezoidal frame one 310, the deformation of the long and thin pipe during pipe bending can be effectively controlled, a plurality of limiting mechanisms 300 are arranged on the boost route, which can effectively avoid unexpected bending deformation, effectively improve the work stability, make the pipe more in line with the standard, and the sliding frame one 313 and the sliding frame two 317 are inserted, which can effectively stabilize one end of the square rod two 312, prevent shaking during boosting, cause invalid limiting, and effectively improve the limiting stability.

[0056] Embodiment Two

[0057] As Figure 2 shown in the embodiment, the boosting clamping mechanism 200 comprises the following parts: two L-shaped frames 230 are arranged on both sides of the sliding table of the linear motor 210, square bars 231 are fixedly connected to the outer walls of the L-shaped frames 230, and the outer walls of the square bars 231 are slidably connected to the inner part of the sliding groove 111.

[0058] In the embodiment, when the linear motor 210 drives the clamped pipe to move towards the pipe bending unit 120, the square bar 231 slides along the track of the sliding groove 111 and first contacts the corresponding trapezoidal frame 322, the trapezoidal frame 322 is pressed by the square bar 231 and moves upwards, at this time, the square plate 325 is separated from the square groove 311 and the trapezoidal frame 310 is released, when the outer wall of the shell 220 contacts the trapezoidal frame 310, the trapezoidal frame 310 is pressed and slides into the inner part of the sliding groove 112 to leave the moving range of the shell 220, so that the limiting mechanism 300 avoids the shell 220, when the shell 220 drives the pipe to move back, after the shell 220 avoids the trapezoidal frame 310, the trapezoidal frame 310 is extended outwards by the rebound of the spring 316 and the rubber wheel 315 is tightly attached to the outer wall of the pipe, at this time, with the moving away of the shell 220, the square bar 231 is separated from the trapezoidal frame 322, the square plate 325 is inserted into the corresponding square groove 311 by the rebound of the spring 322, and the rubber wheel 315 is limited, the square plate 325 is separated from the corresponding square groove 311 by the first contact of the square bar 231 and the trapezoidal frame 322, the trapezoidal frame 310 is released, the shell 220 contacts the trapezoidal frame 310, the trapezoidal frame 310 moves away from the shell 220, when the shell 220 moves, the limiting mechanism 300 does not block the movement of the shell 220, at the same time, when the shell 220 drives the pipe to move back, the limiting mechanism 300 can quickly limit the pipe, the mechanical linkage and flexibility are effectively improved, the pipe can be limited, and the boosting clamping mechanism 200 can work without affecting the movement.

[0059] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the foregoing embodiments should be considered in all aspects as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the foregoing description, and all changes falling within the meaning and range of equivalency of the elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be considered as limiting the claims involved.

[0060] Furthermore, it should be understood that although the description is made according to the embodiments, not every embodiment contains only one independent technical solution, and the description is made in this way only for the sake of clarity, and the person skilled in the art should consider the description as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other embodiments that the person skilled in the art can understand.

Claims

1. A pipe bending boosting mechanism of a pipe bender, comprising: a pipe bending mechanism (100) comprising a workbench (110); a pipe bending unit (120) fixed at one end of the workbench (110); characterized in that it further comprises: a chute one (111) provided with two, respectively opened at both sides of the bottom wall of the workbench (110); a chute two (112) provided with several, equidistantly opened on the table top of the workbench (110); a square hole one (113) provided with several, equidistantly opened on the table top of the workbench (110), and the interior of the square hole one (113) communicates with the interior of the chute two (112); a square hole two (114) opened on the table top of the workbench (110) at the chute two (112); a boosting clamping mechanism (200) fixed on the workbench (110) and capable of boosting the pipe; a limiting mechanism (300) provided with several, equidistantly fixed on the table top of the workbench (110) and capable of limiting the pipe during boosting.

2. A tube bending assisting mechanism of a tube bender according to claim 1, characterized by The boosting clamping mechanism (200) comprises: a linear motor (210) fixed with the bottom wall of the workbench (110), the slide of the linear motor (210) fixedly connected with a shell (220); a chute three (221) provided with four, equi-angle opened in the interior of the shell (220), the interior of the chute three (221) slidingly inserted with a block one (222); a round rod (227) fixed on the outer wall of the block one (222).

3. A tube bending assist mechanism for a tube bender as defined in claim 2 wherein, The boosting clamping mechanism (200) comprises: a motor (224) fixed on the inner wall of one end of the shell (220), the rotating shaft of the motor (224) fixedly connected with a threaded rod (225); a round frame (223) screwed on the outer wall of the threaded rod (225), the round frame (223) slidingly inserted with the inner wall of the shell (220); a block two (226) provided with four groups, equi-angle fixed on the outer wall of the round frame (223), the outer wall of the block two (226) opened with an arc-shaped hole (228), the arc-shaped hole (228) slidingly inserted with the round rod (227).

4. A tube bending assist mechanism for a tube bender as defined in claim 3 wherein, The boosting clamping mechanism (200) comprises: an L-shaped frame (230) provided with two, respectively fixed at both sides of the slide of the linear motor (210), the outer wall of the L-shaped frame (230) fixedly connected with a square rod one (231), the outer wall of the square rod one (231) slidingly inserted with the interior of the chute one (111).

5. A tube bending assist mechanism for a tube bender as defined in claim 4 wherein, The limiting mechanism (300) comprises: a trapezoidal frame one (310) slidingly inserted with the interior of the chute two (112), the outer wall of the trapezoidal frame one (310) equidistantly opened with a square groove (311), the outer wall of the trapezoidal frame one (310) fixedly connected with a square rod two (312), the outer wall of the trapezoidal frame one (310) and the inner wall of the square hole one (113) fixedly connected with a spring one (316); a rotating seat (314) fixed on the outer wall of the square rod two (312), the rotating seat (314) rotatably connected with a rubber wheel (315).

6. A tube bending assist mechanism for a tube bender as defined in claim 5 wherein, The limiting mechanism (300) comprises: a slide one (313) fixed at one end of several square rod two (312); a slide (317) fixed at one end of the other square rod two (312) and opposite to the slide one (313).

7. A tube bending assist mechanism for a tube bender as defined in claim 6 wherein, The limiting mechanism (300) comprises: A square shell (320) is fixed with the table top (110), a U-shaped frame (324) is slidingly inserted into the square shell (320), spring two (321) is fixedly connected between the outer wall of the U-shaped frame (324) and the inner wall of the square shell (320), trapezoidal frame two (322) is fixedly connected to one end of the U-shaped frame (324), square hole three (323) is formed in the outer wall of the trapezoidal frame two (322) at the center, and the trapezoidal frame two (322) is slidingly inserted into the square hole one (113); Two square plates (325) are arranged and fixed on both sides of one end of the U-shaped frame (324), the square plate (325) is inserted and matched with the square groove (311), and the outer wall of the square plate (325) is slidingly inserted into the square hole two (114).

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