Hoop bending machine with positioning assembly

Abstract

The utility model discloses a hoop bending machine with a positioning assembly, which relates to the field of building material processing equipment, solves the problem of length positioning in the bending process of steel bars, and is characterized in that the hoop bending machine comprises a working table, and a bending assembly and a baffle assembly are arranged on the working table; the bending assembly comprises a working disc, a stand column and a bending plate. The stand column and the bending plate are arranged on the working disc and used for clamping the bending end of the reinforcing steel bar and driving the bending end of the reinforcing steel bar to rotate along the stand column. The baffle assembly comprises a first baffle used for preventing the tail of the steel bar from rotating. The workbench is further provided with a positioning assembly, the positioning assembly comprises a positioning plate, and the positioning plate is provided with a graduated scale. The top of the positioning plate and the top of the working disc are on the same plane. And the positioning plate is used for positioning a bending point of the reinforcing steel bar. Through the scheme, the bending quality is improved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of building material processing equipment, and more specifically, to a hoop bending machine with a positioning component. Background Art

[0002] Hoop bending machines are widely used in the construction industry and can be used to make steel components of various shapes. Some steel components need to be bent multiple times before they can be processed into a specific shape. In actual use, the demand for steel components is large and requires a lot of processing. The distance between the two bending points needs to be controlled mainly through the experience of the workers. This results in low precision in steel bending, and even the error is outside the range allowed by the project. Utility Model Content

[0003] The utility model aims to provide a hoop bending machine with a positioning component to achieve the purpose of positioning the bending point.

[0004] The above-mentioned technical purpose of the utility model is achieved through the following technical solutions: a hoop bending machine with a positioning assembly, the hoop bending machine includes a workbench, and a bending assembly and a baffle assembly are arranged on the workbench; the bending assembly includes a working disk, a column and a bending plate; the column and the bending plate are arranged on the working disk, and the column and the bending plate are used to clamp the bent end of the steel bar and drive the bent end of the steel bar to rotate along the column; the baffle assembly includes a first baffle for preventing the tail of the steel bar from rotating; a positioning assembly is also arranged on the workbench, and the positioning assembly includes a positioning plate, and a scale is arranged on the positioning plate; the top of the positioning plate is in the same plane as the top of the working disk; the positioning plate is used to realize the positioning of the bending point of the steel bar.

[0005] Through the above solution, workers can locate the bending point of the steel bar by using a ruler, which improves the processing accuracy of the steel bar components. Workers do not need to disperse too much energy on positioning, thereby improving work efficiency.

[0006] Furthermore, the workbench is provided with a mounting hole, and the positioning plate is provided with a slot hole corresponding to the mounting hole; a support column passing through the mounting hole and the slot hole along the axis is provided; the mounting screws pass through the slot hole and the support column in sequence to fix the positioning plate and the workbench; the support column is used to keep the top of the positioning plate and the top of the work disk in the same plane.

[0007] Furthermore, a limiting platform is arranged in the slot hole; through the cooperation between the limiting platform and the screw, the screw sinks into the positioning plate while the positioning plate is installed.

[0008] Through the above solution, the screws are sunk into the positioning plate, so that the screws no longer protrude from the upper surface of the positioning plate. During the bending process of the steel bar, the screws will not affect the movement of the steel bar.

[0009] Furthermore, the positioning plate is provided with a mounting groove parallel to the scale, and the mounting groove is used to install a baffle; the baffle includes a first baffle; the first baffle includes a first mounting portion and a first positioning portion, and the first positioning portion and the first mounting portion are L-shaped; a bolt hole is provided on the first mounting portion, and the bolt hole and the mounting groove are connected by bolts to fix the first baffle on the positioning plate; the first positioning portion and the slide groove form an angle of 93 to 96 degrees.

[0010] When in use, the length of the steel bar is positioned by the baffle, which makes the operation more efficient; and the baffle is prevented from being damaged by the steel bar when it is bent by setting the angle.

[0011] Furthermore, the baffle also includes a second baffle; the second baffle includes a second mounting portion and a second positioning portion, and the second positioning portion and the second mounting portion are arranged in an L shape; a bolt hole is arranged on the second mounting portion, and the bolt hole and the mounting groove are connected by bolts to fix the second baffle on the positioning plate; the second positioning portion is provided with a positioning plate; the positioning plate and the second positioning portion are rotatably connected.

[0012] When in use, the second blocking piece is located on the route of the steel bar to play a positioning role; when positioning is not needed, it is rotated to the other side and will not block the advancement of the steel bar.

[0013] Furthermore, the second positioning portion is connected to the positioning piece via a mounting bolt, a positioning piece ring is sleeved on the mounting bolt, and the positioning piece is arranged on the positioning piece ring.

[0014] Furthermore, the column is arranged in the middle of the working disk; the bending plate is connected to the turntable through an adjusting mechanism; the adjusting mechanism includes a fixed plate and an adjusting component; the fixed plate is connected to the working disk; the adjusting component includes a socket, an adjusting rod and a second nut; the socket is arranged on the fixed plate; a thread is arranged on the adjusting rod; one end of the adjusting rod is connected to the bending plate, and the other end is inserted into the socket; and two second nuts are also included, which cooperate with the adjusting rod and are located on both sides of the socket.

[0015] Furthermore, it comprises three adjusting components, and the three adjusting components are distributed in a triangular shape on the back side of the bending plate.

[0016] Furthermore, the baffle assembly also includes a base and a telescopic mechanism, the base is arranged on a workbench, and the first baffle is connected to the base through the telescopic mechanism;

[0017] The base comprises a first side plate, a second side plate and a bottom plate; the first side plate and the second side plate are connected to the workbench; the first side plate and the second side plate are arranged in parallel; the bottom plate is arranged between the first side plate and the second side plate, and the bottom plate divides the space between the first side plate and the second side plate into an upper layer and a lower layer; and a through hole is arranged on the bottom plate;

[0018] The telescopic mechanism includes a slider, which is arranged on the upper layer. The slider is provided with a penetrating slide groove, and the direction of the slide groove is parallel to the first side plate and the second side plate; it also includes a bolt, which passes through the slide groove and the through hole in turn and is connected to the third nut on the lower layer; after tightening the bolt, the slider can be fixed to the bottom plate.

[0019] In summary, the utility model has the following beneficial effects: by providing a positioning plate, the bending accuracy of the steel bars can be improved, the bending quality can be improved, and the bending efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of an embodiment;

[0021] Figure 2 Schematic diagram of the position relationship of the bending assembly, baffle assembly and positioning assembly in the embodiment

[0022] Figure 3 This is a schematic diagram of the bending component

[0023] Figure 4 Schematic diagram of the baffle assembly

[0024] Figure 5 This is the exploded diagram of the positioning component installation

[0025] Figure 6 This is the first baffle diagram

[0026] Figure 7 This is the second baffle explosion diagram

[0027] Figure 8 Schematic diagram of the support frame

[0028] In the figure: 0, steel bar; 1, cabinet; 10, control panel; 2, workbench; 3, bending assembly; 30, work plate; 31, bending plate; 32, column; 33, fixing plate; 34, adjusting rod; 35, second nut; 36, supporting nut; 401, first side plate; 402, second side plate; 403, bottom plate; 404, tail plate; 405, through hole; 41, first baffle; 42, slider; 421, slide groove; 422, third nut ; 43. Back panel; 5. Positioning assembly; 50. Positioning plate; 501. Scale; 502. Mounting slot; 503. Slot hole; 504. Limiting platform; 505. Mounting screw; 506. Support column; 51. First baffle; 511. First mounting portion; 512. First positioning portion; 521. Second mounting portion; 522. Second positioning portion; 523. Positioning sheet; 524. Positioning sheet ring; 6. Support frame; 61. Crossbar; 62. Support seat. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component. The "connection" is not limited to fixed connection or movable connection. The specific connection method should be determined based on the specific technical problem to be solved.

[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] Example:

[0034] A hoop bending machine with a positioning assembly, the hoop bending machine comprises a cabinet 1, a workbench 2 is arranged on the top, a bending assembly 3 and a baffle assembly are arranged on the workbench 2; the bending assembly 3 comprises a working disk 30, a column 32 and a bending plate 31; the column 32 is arranged in the middle of the working disk 30, and the bending plate 31 is arranged on the working disk 30, and the column 32 and the bending plate 31 are used to clamp the bent end of the steel bar 0, and drive the bent end of the steel bar 0 to rotate along the column 32. A motor, a reducer, a control device, and a foot switch are arranged in the hangar, and the motor drives the working disk 30 to rotate through the reducer. The controller is used to control the rotation angle of the working disk 30. There is still only a control panel 10 on the cabinet 1, and the control panel 10 is used to display parameters, adjust parameters, etc. The foot switch controls the rotation of the working disk 30 through the control device. Wheels are also arranged under the cabinet 1, and the hoop bending machine can be easily transferred by the wheels. Optionally, two foot switches are included to control the rotation of the work disk 30 to different angles; when in use, the foot switches can free the workers' hands and reduce their workload; different switches control different rotation angles, which can reduce the number of resetting steps when bending the steel bar 0, simplifying the workers' operating steps.

[0035] In this embodiment, the bending assembly 3 also includes an adjustment mechanism, and the bending plate 31 is connected to the turntable through the adjustment mechanism; the adjustment mechanism includes a fixed plate 33 and an adjustment component; the fixed plate 33 is connected to the working disk 30; the fixed plate 33 is arranged in parallel with the bending plate 31 and connected through the adjustment component; the adjustment component includes a socket, an adjustment rod 34 and a second nut 35; the socket is arranged on the fixed plate 33; the adjustment rod 34 is provided with a thread; one end of the adjustment rod 34 is connected to the bending plate 31, and the other end is inserted into the socket; and two second nuts 35 are also included, and the two second nuts 35 cooperate with the adjustment rod 34 and are located on both sides of the socket. By adjusting the positions of the two second nuts 35 on the adjustment rod 34, the bending plate 31 can be moved closer to or away from the fixed plate 33, thereby achieving the effect of the bending plate 31 being closer to or away from the column 32 to match steel bars of different diameters.

[0036] Preferably, a threaded hole is provided on the bending plate 31, and the adjusting rod 34 is connected to the bending plate 31 through the threaded hole; the bending plate 31 is easily worn due to long-term contact with the steel bar, and the above-mentioned arrangement can facilitate replacement of the bending plate 31.

[0037] Preferably, a supporting nut 36 is further provided on the adjusting rod 34, and the supporting nut 36 abuts against the bending plate 31. After the abutment, the force of the bending plate 31 during the bending process can be better transmitted to the fixing plate 33 through the adjusting rod 34; at the same time, it plays a role of auxiliary fixing.

[0038] Preferably, three adjusting components are included, and the three adjusting components are distributed in a triangular shape on the back side of the bending plate 31; the above arrangement makes the load distribution more uniform.

[0039] In this embodiment, the baffle assembly also includes a base and a telescopic mechanism. The base is arranged on the workbench 2, and the first baffle 41 is connected to the base through the telescopic mechanism; the base includes a first side plate 401, a second side plate 402, and a bottom plate 403; the first side plate 401 and the second side plate 402 are connected to the workbench 2; the first side plate 401 and the second side plate 402 are arranged in parallel; the bottom plate 403 is arranged between the first side plate 401 and the second side plate 402, and the bottom plate 403 divides the space between the first side plate 401 and the second side plate 402 into The upper layer and the lower layer; the bottom plate 403 is provided with a through hole 405; the telescopic mechanism includes a slider 42, which is arranged on the upper layer, and a through slot 421 is arranged on the slider 42, and the direction of the slot 421 is parallel to the first side plate 401 and the second side plate 402; it also includes a bolt, which passes through the slot 421 and the through hole 405 in sequence, and is connected with the third nut 422 in the lower layer; after tightening the bolt, the slider 42 can be fixed on the bottom plate 403; the first side plate 401 and the second side plate 402 can prevent the slider 42 from rotating around the bolt. When adjusting, loosen the bolt with a wrench, the slider 42 is loosened, and the slider 42 can be pushed forward and backward to push the first baffle 41 forward and backward, and when it moves to a suitable position, tighten the bolt to complete the fixation.

[0040] Preferably, the width of the slider 42 is equal to the width between the first side plate 401 and the second side plate 402; two sets of third nuts 422 are provided on the slider 42, and two through holes 405 are correspondingly provided on the bottom plate 403; the above arrangement can better prevent the slider 42 from rotating.

[0041] Preferably, the base further comprises a tail plate 404, the tail plate 404 is connected to the first side plate 401 and the second side plate 402, a tail plate hole is provided on the tail plate 404, a tail plate 404 bolt is provided in the tail plate hole, and the tail of the tail plate 404 bolt abuts against the slider 42. After the slider 42 is positioned by the third nut 422, the tail plate 404 bolt is rotated to abut against the slider 42, so as to better prevent the slider 42 from sliding.

[0042] Preferably, a back plate 43 is provided on the slider 42, and the first baffle 41 is detachably mounted on the back plate 43. Optionally, a back plate hole is provided on the back plate 43, and a threaded hole is provided on the first baffle 41, and the first baffle 41 is fixed to the back plate 43 by bolts. Through the above solution, the back plate 43 can be easily replaced in the case that the first baffle 41 is worn. Preferably, a reinforcing beam for supporting the back plate 43 is provided between the slider 42 and the back plate 43.

[0043] In this embodiment, the adjustment structure for adjusting the bending plate 31 and the base and telescopic mechanism for adjusting the first baffle plate 41 are both intended to adjust the extension length of the bending plate 31 or the first baffle plate 41; in other possible embodiments, the adjustment of the bending plate 31 and the adjustment of the first baffle plate 41 may only adopt one of the above-mentioned structures.

[0044] In this embodiment, a positioning assembly 5 is also provided on the workbench, and the positioning assembly 5 includes a positioning plate 50, and a scale 501 is provided on the positioning plate 50. The arrangement direction of the scale is the same as the direction in which the steel bar to be bent moves forward. The top of the positioning plate 50 is in the same plane as the top of the working disk; the positioning plate 50 is in the same horizontal plane as the top of the working disk, which can support the steel bar while playing a positioning role. The positioning plate 50 is used to locate the bending point of the steel bar. Specifically, when in use, the steel bar to be bent is pushed forward, and the corresponding scale is found on the scale 501, so that it can be known whether the bending point is at the target distance. On the one hand, workers do not need to determine the position of the bending point based on experience, which will not distract the workers and improve work efficiency. On the other hand, the accuracy of steel bar component processing is improved.

[0045] In this embodiment, the workbench is provided with a mounting hole, and the positioning plate 50 is provided with a slotted hole 503 corresponding to the mounting hole; a support column 506 is provided between the mounting hole and the slotted hole 503 and is passed through along the axis; the mounting screws 505 pass through the slotted hole 503 and the support column 506 in sequence to fix the positioning plate 50 to the workbench; the support column 506 is used to keep the top of the positioning plate 50 and the top of the working disk in the same plane. The support column 506 determines the distance between the positioning plate 50 and the workbench, which can ensure that the positioning plate 50 and the working disk are in the same plane. In the process of positioning the steel bars, it can play a role of auxiliary support and reduce the labor intensity of the workers.

[0046] In this embodiment, a limiting platform 504 is provided in the slot hole 503; through the cooperation between the limiting platform 504 and the mounting screw 505, the mounting screw 505 is sunk into the positioning plate 50 while the positioning plate 50 is installed. Specifically, the distance between the limiting platform 504 and the upper surface of the positioning plate 50 is greater than or equal to the height of the screw head. When the mounting screw 505 is tightened, the head of the mounting screw 505 is sunk into the slot hole 503 and will not be exposed from the upper surface of the positioning plate 50. During the bending process of the steel bar, the mounting screw 505 will not affect the movement of the steel bar.

[0047] In this embodiment, the positioning plate 50 is provided with a mounting groove 502 parallel to the scale 501, and the mounting groove 502 is used to install a baffle; the baffle includes a first baffle 51; the first baffle 51 includes a first mounting portion 511 and a first positioning portion 512, and the first positioning portion 512 and the first mounting portion 511 are arranged in an L shape; a bolt hole is provided on the first mounting portion 511, and the bolt hole and the mounting groove 502 are connected by bolts to fix the first baffle 51 on the positioning plate 50; the first positioning portion 512 and the slide groove are at an angle of 93 to 96 degrees. Loosen the bolts, the first baffle 51 can slide in the mounting groove 502, and after moving to a suitable position, tighten the bolts. The first positioning portion 512 and the slide groove are at an angle of 93 to 96 degrees, and the first positioning portion 512 and the tangent of the moving arc when the steel bar is bent are at an angle of 3 to 6 degrees, mainly to avoid the positioning portion from getting stuck to the steel bar during bending, causing damage to the positioning portion of the first baffle 51. When operating, workers only need to push the steel bar to the first baffle to determine the position of the bending point. Workers do not need to spend energy on finding the scale, which further improves their work efficiency.

[0048] In this embodiment, if Figure 7 As shown, the first mounting portion 511 is connected to the positioning plate 50 by two bolts, and the connecting line of the two bolts and the projection line of the center line of the first baffle 51 on the positioning plate 50 form an angle of 3 to 6 degrees. Through the above scheme, it can be ensured that the first positioning portion 512 and the slide groove form an angle of 93 to 96 degrees. Through the above angle, the positioning accuracy can be maximized while ensuring that the rotation of the steel bar is not blocked, so that its error is within the acceptable range of the project.

[0049] In this embodiment, the blocking piece further includes a second blocking piece 52; the second blocking piece 52 includes a second mounting portion 521 and a second positioning portion 522, and the second positioning portion 522 and the second mounting portion 521 are arranged in an L shape; a bolt hole is arranged on the second mounting portion 521, and the bolt hole and the mounting groove 502 are connected by bolts to fix the second blocking piece 52 on the positioning plate 50; the second positioning portion 522 is provided with a positioning piece 523; the positioning piece 523 and the second positioning portion 522 are rotatably connected. When in use, the second blocking piece 52 is located on the route of the steel bar to play a positioning role; when positioning is not needed, it is rotated to the other side and will not block the forward movement of the steel bar.

[0050] In this embodiment, the second positioning portion 522 is connected to the positioning piece 523 by a mounting bolt, and a positioning piece ring 524 is sleeved on the mounting bolt, and the positioning piece 523 is arranged on the positioning piece ring 524. The positioning piece ring 524 is between the head of the mounting bolt and the second positioning portion 522. The positioning piece 523 is sleeved on the positioning piece ring 524 and can rotate around the positioning piece ring 524. While the above scheme realizes the rotation function of the positioning piece 523, the positioning piece 523 can also be replaced in time after the positioning piece ring 524 is damaged. Preferably, the height of the positioning piece ring 524 is greater than the thickness of the positioning piece 523 so as not to affect its rotation and ensure that the positioning accuracy is within the acceptable range of the project. In a possible embodiment, the difference between the height of the positioning piece ring 524 and the thickness of the positioning piece 523 is 0.5 to 1 mm.

[0051] In other possible embodiments, a plurality of second baffles 52 are included, and the second baffles 52 are disposed between the first baffle 51 and the working plate. The number of baffles is determined according to the number of steel bars to be bent. For example, if the steel bar needs to be bent into three sections of different lengths, the steel bar needs to be bent at least twice, and the number of baffles is at least two.

[0052] The method of using this embodiment is as follows: select a suitable number of baffles according to the number and length of the steel bar to be bent, and fix the baffles in a suitable position with reference to the scale 501. After placing the steel bar between the column and the bending plate, push it forward until the baffle position of the corresponding length, and step on the pedal to bend the steel bar; when bending the second section, move forward or backward to the appropriate baffle position, and step on the pedal to achieve bending; and so on to bend the steel bar into a suitable shape.

[0053] The beneficial effects of this embodiment are that the bending efficiency is improved and the bending accuracy is enhanced.

[0054] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A hoop bending machine with a positioning assembly, the hoop bending machine comprises a workbench, a bending assembly and a baffle assembly are arranged on the workbench; the bending assembly comprises a working disk, a column and a bending plate; the column and the bending plate are arranged on the working disk; the column and the bending plate are used to clamp the bent end of the steel bar and drive the bent end of the steel bar to rotate along the column; the baffle assembly comprises a first baffle, which is used to prevent the tail of the steel bar from rotating; its characteristics are: The workbench is also provided with a positioning assembly, which includes a positioning plate, on which a scale is provided; the top of the positioning plate is in the same plane as the top of the work disk.

2. A hoop bending machine with a positioning assembly according to claim 1, characterized in that: The workbench is provided with a mounting hole, and the positioning plate is provided with a slot corresponding to the mounting hole; a support column is provided between the mounting hole and the slot; the mounting screws pass through the slot and the support column in sequence to fix the positioning plate and the workbench; the support column is used to keep the top of the positioning plate and the top of the work disk in the same plane.

3. A hoop bending machine with a positioning assembly according to claim 2, characterized in that: A limiting platform is arranged in the slot hole; through the cooperation between the limiting platform and the screw, the screw sinks into the positioning plate while the positioning plate is installed.

4. A hoop bending machine with a positioning assembly according to claim 3, characterized in that: The positioning plate is provided with a mounting groove parallel to the scale, and the mounting groove is used to install a baffle; the baffle includes a first baffle; the first baffle includes a first mounting portion and a first positioning portion, and the first positioning portion and the first mounting portion are L-shaped; a bolt hole is provided on the first mounting portion, and the bolt hole and the mounting groove are connected by bolts to fix the first baffle on the positioning plate; the first positioning portion and the slide groove form an angle of 93 to 96 degrees.

5. A hoop bending machine with a positioning assembly according to claim 4, characterized in that: The blocking piece also includes a second blocking piece; the second blocking piece includes a second mounting portion and a second positioning portion, and the second positioning portion and the second mounting portion are arranged in an L shape; a bolt hole is arranged on the second mounting portion, and the bolt hole and the mounting groove are connected by bolts to fix the second blocking piece on the positioning plate; the second positioning portion is provided with a positioning piece; the positioning piece and the second positioning portion are rotatably connected.

6. A hoop bending machine with a positioning assembly according to claim 4, characterized in that: The second positioning portion is connected to the positioning piece through a mounting bolt, a positioning piece ring is sleeved on the mounting bolt, and the positioning piece is arranged on the positioning piece ring.

7. A hoop bending machine with a positioning assembly according to claim 4, characterized in that: The column is arranged in the middle of the working disk; the bending plate is connected to the turntable through an adjusting mechanism; the adjusting mechanism includes a fixed plate and an adjusting component; the fixed plate is connected to the working disk; the adjusting component includes a socket, an adjusting rod and a second nut; the socket is arranged on the fixed plate; a thread is arranged on the adjusting rod; one end of the adjusting rod is connected to the bending plate, and the other end is inserted into the socket; and two second nuts are also included, which cooperate with the adjusting rod and are located on both sides of the socket.

8. A hoop bending machine with a positioning assembly according to claim 4, characterized in that: The baffle assembly also includes a base and a telescopic mechanism, the base is arranged on a workbench, and the first baffle is connected to the base through the telescopic mechanism; The base comprises a first side plate, a second side plate and a bottom plate; the first side plate and the second side plate are connected to the workbench; the first side plate and the second side plate are arranged in parallel; the bottom plate is arranged between the first side plate and the second side plate, and the bottom plate divides the space between the first side plate and the second side plate into an upper layer and a lower layer; and a through hole is arranged on the bottom plate; The telescopic mechanism includes a slider, which is arranged on the upper layer. The slider is provided with a penetrating slide groove, and the direction of the slide groove is parallel to the first side plate and the second side plate; it also includes a bolt, which passes through the slide groove and the through hole in turn and is connected to the third nut on the lower layer; after tightening the bolt, the slider can be fixed to the bottom plate.

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