Acrylic plate bending processing device

Abstract

The invention relates to the technical field of acrylic machining, and discloses an acrylic plate bending machining device which comprises a supporting base, a blocking mechanism, a lifting mechanism and a heating mechanism, the blocking mechanism comprises a supporting plate and a limiting rod, the supporting plate is detachably connected to the upper portion of the supporting base, and the limiting rod is arranged on the supporting plate; the ends of the multiple limiting rods are detachably connected to the outer wall of the supporting plate. And the lifting mechanism comprises a fixing frame, hydraulic rods and a pushing frame, the fixing frame is fixedly installed on the top of the supporting base, and the multiple hydraulic rods are fixedly installed below the fixing frame and located on the two sides of the supporting base correspondingly. According to the acrylic plate bending machining device, by arranging the limiting rods, the position of the acrylic plate installed on the supporting plate can be adjusted according to different bending requirements, then the acrylic plate bending machining device can be suitable for different bending requirements, meanwhile, the acrylic plate bending machining device is matched with the hydraulic rods and the pushing frame, and the pushing frame can drive an acrylic plate to float up and down.

Description

Technical Field

[0001] The invention relates to the technical field of acrylic processing, and in particular to an acrylic plate bending processing device. Background Art

[0002] Acrylic sheet, also known as plexiglass, has the chemical name of polymethyl methacrylate. It has certain strength and toughness and is not easy to break. Compared with ordinary glass, it is less likely to break into sharp fragments when impacted. It has higher safety and is often used to make some items that require a certain strength and have safety requirements, such as bathtubs, instrument casings, etc. In the processing and application field of acrylic sheets, acrylic sheets are widely used due to their good transparency, chemical stability and mechanical properties. In the manufacturing process of many products, acrylic sheets are often required to be bent to meet specific shape and structural design requirements.

[0003] Traditional acrylic sheet bending methods often rely on manual operation. After heating a local area of ​​the acrylic sheet, the sheet is bent based on the worker's experience and hand tools. During the bending operation, the worker relies on his own experience and hand tools, such as pliers and wrenches, to bend. This manual operation method is not only inefficient and difficult to meet the needs of large-scale production, but also due to the lack of precise measurement and positioning auxiliary tools, during the bending process, the worker's uneven force application and the mismatch between the hand tools and the contact parts of the acrylic sheet will leave marks, indentations or tiny wrinkles on the surface, which are prone to problems such as inaccurate bending angles and uneven surfaces at the bends, seriously affecting the quality and aesthetics of the product. Summary of the invention

[0004] The present invention provides an acrylic plate bending processing device, which can adjust the heating position in a targeted manner according to different bending requirements of the acrylic plate, and can also accurately bend the acrylic plate after the heating is completed, thereby reducing the participation of manual operation, ensuring work efficiency and improving processing accuracy.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: An acrylic plate bending processing device is designed, including a support seat, a blocking mechanism, a lifting mechanism and a heating mechanism, wherein: The blocking mechanism includes a support plate and a limiting rod, wherein the support plate is detachably connected to the upper part of the support seat, and ends of the plurality of limiting rods are detachably connected to the outer wall of the support plate; The lifting mechanism includes a fixed frame, a hydraulic rod and a pushing frame, wherein the fixed frame is fixedly installed on the top of the support seat, a plurality of hydraulic rods are respectively fixedly installed below the fixed frame and located on both sides of the support seat, and the bottom of the pushing frame is fixedly connected to the output end of the hydraulic rod; The heating mechanism can be slidably connected to the upper part of the fixing frame to heat the acrylic plate.

[0006] Optionally, the blocking mechanism also includes a bracket and fixing bolts, and a plurality of the fixing bolts are threadedly penetrated at both ends of the outer surfaces of the two brackets, the lower end of the bracket is connected to the outer wall of the support seat through the fixing bolts, and the upper end of the bracket is connected to the outer wall of the support plate through the fixing bolts.

[0007] Optionally, the blocking mechanism further includes a fixing hole and a connecting rod, a plurality of the fixing holes are evenly opened on the outer wall of the support plate, the connecting rod is connected to the outer wall of the fixing hole by bolts, and the end of the limiting rod is threadedly connected to the end of the connecting rod.

[0008] Optionally, the heating mechanism includes an adjustment plate, a fixing seat and a heating plate, the adjustment plate is slidably connected to the top of the fixing frame, the fixing seat is detachably connected to the top of the adjustment plate by bolts, and the heating plate is fixedly installed on the top of the fixing seat.

[0009] Optionally, the heating mechanism further comprises a push rod, wherein two push rods are respectively fixedly mounted on two ends of the adjustment plate, and a protective cover is sleeved on the outer surface of the push rod.

[0010] Optionally, a supporting mechanism is provided on the top of the lifting mechanism, and the supporting mechanism includes a guide groove, a movable plate, a compression spring and a fixed plate. The two guide grooves are opened on both sides of the top of the pushing frame, the two movable plates are respectively slidably connected to the inner walls of the two guide grooves, the two compression springs are respectively slidably connected to the inner walls of the two guide grooves, and the two ends of the fixed plate are rotatably connected to the outer walls of the two movable plates through a rotating shaft.

[0011] Optionally, the support mechanism also includes a limit plate and a positioning bolt, the limit plate is detachably connected to the two ends of the pushing frame, a plurality of the positioning bolts are respectively threaded through the outer wall of the limit plate, and one end of the positioning bolt passes through the limit plate and is threaded through the outer wall of the pushing frame.

[0012] Optionally, a limiting mechanism is provided on the outer wall of the fixing plate, and the limiting mechanism includes a clamping plate and a pressure rod, the two clamping plates are fixedly connected to the outer wall of the fixing plate, and the pressure rod is threadedly penetrated through the top of the clamping plate.

[0013] The present invention provides an acrylic plate bending processing device, which has the following beneficial effects: The acrylic plate bending processing device adjusts the heating position by sliding the heating mechanism on the fixed frame, and can accurately heat the part of the acrylic plate that needs to be bent according to the specific bending requirements without the need for holding. The limit rod is supported by the support plate, and the position of the limit rod installed on the support plate can be adjusted according to the different bending curvatures or bending positions. It can be suitable for different bending requirements (i.e., bending curvatures or bending positions), and at the same time cooperates with the hydraulic rod and the pushing frame. The pushing frame can drive the acrylic plate to float up and down, and then fit the acrylic plate to the surface of the limit rod. The acrylic plate is bent with the help of the blocking of the limit rod, which reduces the intervention of manual operation, improves work efficiency, and can also ensure bending accuracy and flatness. Through the cooperation of the hydraulic rod and the pushing frame, the output driving force can be stably controlled to ensure consistent product quality during mass production and improve bending accuracy and flatness at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall installation structure of the present invention; Figure 2 This is a schematic diagram of the explosion structure of the blocking mechanism of the present invention; Figure 3 This is a schematic diagram of the installation structure of the heating mechanism and the supporting mechanism of the present invention; Figure 4 This is a schematic diagram of the explosion structure of the lifting mechanism of the present invention; Figure 5 This is a schematic diagram of the exploded structure of the support mechanism of the present invention; Figure 6 This is a schematic diagram of the fixing plate installation structure of the present invention; Figure 7 It is a schematic diagram of the heating mechanism structure of the present invention.

[0015] In the figure: 1. support seat; 2. blocking mechanism; 201. bracket; 202. fixing bolt; 203. support plate; 204. fixing hole; 205. connecting rod; 206. limiting rod; 3. lifting mechanism; 301. fixing frame; 302. hydraulic rod; 303. pushing frame; 4. heating mechanism; 401. adjusting plate; 402. fixing seat; 403. heating plate; 404. pushing rod; 5. supporting mechanism; 501. guide groove; 502. movable plate; 503. compression spring; 504. limiting plate; 505. positioning bolt; 506. fixing plate; 6. limiting mechanism; 601. clamping plate; 602. pressing rod. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in the field without making creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0017] See also Figures 1 to 7 The embodiment of the present invention provides a bending processing device, which is applied to the scene where acrylic plates are bent according to different requirements. In this embodiment, the structure of the bending processing device is improved to enable it to have the advantages of fast and accurate bending. Specifically, taking the bending of acrylic plates as an example, as a preferred solution in this embodiment, the bending device is specifically an acrylic plate bending processing device, which can accurately and smoothly bend acrylic plates.

[0018] See also Figures 1 to 7 The present invention provides a technical solution: an acrylic plate bending processing device, which is mainly used in the scene where acrylic plates are bent according to different requirements.

[0019] It includes a support base 1, a blocking mechanism 2, a lifting mechanism 3 and a heating mechanism 4, wherein: The blocking mechanism 2 includes a support plate 203 and a limiting rod 206. The support plate 203 is detachably connected to the upper part of the support seat 1, and a plurality of limiting rods 206 are detachably connected to the outer wall of the support plate 203. The lifting mechanism 3 includes a fixed frame 301, a hydraulic rod 302 and a pushing frame 303. The fixed frame 301 is fixedly installed on the top of the support base 1. A plurality of hydraulic rods 302 are respectively fixedly installed below the fixed frame 301 and located on both sides of the support base 1. The bottom of the pushing frame 303 is fixedly connected to the output end of the hydraulic rod 302. The heating mechanism 4 can be slidably connected to the upper part of the fixing frame 301 to heat the acrylic plate.

[0020] In this embodiment, the basic support structure of the entire device of the support seat 1 provides a stable installation platform for other mechanisms and parts, ensuring that the relative positions of various components remain stable during operation, so that the bending operation can proceed smoothly. The support plate 203 serves as the installation base of the limit rod 206. After being connected to the support seat 1, the height position of the limit rod 206 in space is determined, providing a blocking reference surface for the bending of the acrylic plate, and determining the angle and shape boundary of the bending. The detachable connection method is convenient for adjusting or replacing the support plate 203 according to different processing requirements to adapt to the bending operation of acrylic plates with different specifications and shapes. The main function of the limit rod 206 is to block and position the acrylic plate when it is bent. By adjusting its position on the support plate 203, the bending angle and position of the acrylic plate can be accurately controlled to meet the requirements of different product designs for the bending shape of the acrylic plate. Since it is in direct contact with the acrylic plate and determines the bending shape, the accuracy of its installation position is crucial to the quality of the final product. The fixing frame 301 provides a stable installation base for the hydraulic rod 302 to ensure that the hydraulic rod The stability and verticality of 302 during operation ensure that it can accurately push the push frame 303 to move up and down, thereby realizing the smooth lifting and bending operation of the acrylic plate. The hydraulic rod 302, as a driving power source, can accurately output different thrusts according to the control signal to drive the push frame 303 to move up and down. After the acrylic plate is heated, the push frame 303 is raised through the action of the hydraulic rod 302, and the acrylic plate is attached to the limit rod 206 to complete the bending. Its precise thrust control ability helps to ensure the stability of the bending process. The pushing frame 303 directly acts on the acrylic plate. Under the push of the hydraulic rod 302, the pushing frame 303 can steadily lift the acrylic plate upward and make it contact with the limit rod 206 to complete the bending action. Its structural design needs to ensure a good contact area and fit with the acrylic plate to avoid damage to the acrylic plate during the lifting process, and at the same time ensure that the bending force is evenly distributed on the acrylic plate to ensure the bending quality.

[0021] In the above embodiment, as a preferred scheme, the blocking mechanism 2 also includes a bracket 201 and a fixing bolt 202. A plurality of fixing bolts 202 are respectively threadedly arranged at both ends of the outer surfaces of the two brackets 201. The lower end of the bracket 201 is connected to the outer wall of the support seat 1 by the fixing bolts 202, and the upper end of the bracket 201 is connected to the outer wall of the support plate 203 by the fixing bolts 202. The bracket 201 is fixed by the fixing bolts 202, which enhances the stability of the support plate 203 above the support seat 1, ensures that the entire blocking mechanism 2 will not shake or shift during the bending process, ensures the accuracy of the position of the limit rod 206, and thus ensures the bending accuracy. On the one hand, the fixing bolts 202 are used to tightly connect the bracket 201 with the support seat 1 and the support plate 203 to prevent components from loosening during operation. On the other hand, it facilitates the disassembly and installation of various components, which is beneficial to the maintenance, adjustment and component replacement of the device.

[0022] In the above embodiment, as a preferred scheme, the blocking mechanism 2 also includes a fixing hole 204 and a connecting rod 205. A plurality of fixing holes 204 are evenly arranged on the outer wall of the support plate 203. The connecting rod 205 is connected to the outer wall of the fixing hole 204 by bolts. The end of the limiting rod 206 is threadedly connected to the end of the connecting rod 205. The fixing holes 204 are evenly arranged on the outer wall of the support plate 203, providing a variety of position options for the installation of the connecting rod 205, thereby realizing flexible positioning of the limiting rod 206 on the support plate 203 to adapt to different bending process requirements. The connecting rod 205 serves as a connecting component between the limiting rod 206 and the support plate 203, and is connected to the fixing hole 204 by bolts, so that the limiting rod 206 can be firmly installed on the support plate 203 and the position can be adjusted as needed, further increasing the adjustability and adaptability of the entire blocking mechanism 2.

[0023] In the above embodiment, as a preferred solution, the heating mechanism 4 includes an adjustment plate 401, a fixing seat 402 and a heating sheet 403. The adjustment plate 401 is slidably connected to the top of the fixing frame 301, and the fixing seat 402 is detachably connected to the top of the adjustment plate 401 by bolts. The heating sheet 403 is fixedly installed on the top of the fixing seat 402. The adjustment plate 401 is slidably connected to the top of the fixing frame 301, so that the heating sheet 403 can be adjusted in the horizontal direction, so that different parts of the acrylic plate can be heated, and the precise control of the heating position under different bending shapes and size requirements can be met, thereby improving the adaptability of the device to various acrylic plate processing requirements. The fixing seat 402 provides a stable installation platform for the heating sheet 403, and facilitates the installation, removal and replacement of the heating sheet 403, ensuring that the heating sheet 403 will not shake or move during the working process, ensuring the uniformity and stability of the heating. The heating sheet 403 is the core component for heating the acrylic plate, and generates heat by powering on, so that the local area of ​​the acrylic plate is heated and softened, so as to facilitate the subsequent bending operation.

[0024] In the above embodiment, as a preferred solution, the heating mechanism 4 also includes a push rod 404, and the two push rods 404 are respectively fixedly installed at the two ends of the adjustment plate 401. The outer surface of the push rod 404 is sleeved with a protective cover. The push rod 404 is convenient for the operator to manually push the adjustment plate 401 to slide on the fixed frame 301 to achieve rapid adjustment of the position of the heating plate 403. The protective cover sleeved on the outer surface can protect the operator's hand safety and prevent burns during operation. On the other hand, it can increase the friction between the hand and the push rod 404, making the operation more convenient and stable.

[0025] In the above embodiment, as a preferred solution, a support mechanism 5 is provided on the top of the lifting mechanism 3, and the support mechanism 5 includes a guide groove 501, a movable plate 502, a compression spring 503 and a fixed plate 506. The two guide grooves 501 are opened on both sides of the top of the pushing frame 303, the two movable plates 502 are respectively slidably connected to the inner walls of the two guide grooves 501, the two compression springs 503 are respectively slidably connected to the inner walls of the two guide grooves 501, and the two ends of the fixed plate 506 are respectively rotatably connected to the outer walls of the two movable plates 502 through a rotating shaft. 1 provides a precise track for the sliding of the movable plate 502, ensuring that the movable plate 502 can slide smoothly along the predetermined direction under the action of the compression spring 503, so that the support mechanism 5 can adapt to the lifting requirements of acrylic plates of different thicknesses and always maintain stable support for the acrylic plate during the bending process. The movable plate 502 can automatically adjust its position according to the size of the acrylic plate under the action of the compression spring 503, always closely fit the lower surface of the acrylic plate, provide uniform support force, prevent the acrylic plate from deformation or displacement during the lifting and bending process, and ensure Bending accuracy and product quality, the compression spring 503 provides elastic support for the movable plate 502. When placing acrylic plates of different sizes, the compression spring 503 can automatically adjust the height position of the movable plate 502, so that the support mechanism 5 has a certain degree of self-adaptation, reducing the trouble of frequent adjustment of the device due to the difference in thickness of the acrylic plate, and improving the versatility and work efficiency of the device. The two ends of the fixed plate 506 are rotatably connected to the outer walls of the two movable plates 502 through the rotating shaft. During the bending process of the acrylic plate, as the push frame 303 rises, the fixed plate 506 The plate 506 can rotate at the connection point with the movable plate 502. According to the mutual movement between the limit rod 206 and the acrylic plate, the limit rod 206 gradually fits the upper surface of the acrylic plate, and then the rotation of the fixed plate 506 can ensure the stability of the acrylic plate during the bending process, and cooperate with the compression spring 503 to adjust the position and support angle of the fixed plate 506, further enhancing the support stability of the acrylic plate, avoiding slippage or deformation of the acrylic plate during bending, and ensuring the smooth progress of the bending process and the consistency of product quality.

[0026] In the above embodiment, as a preferred scheme, the support mechanism 5 also includes a limit plate 504 and a positioning bolt 505. The limit plate 504 is detachably connected to the two ends of the pushing frame 303. A plurality of positioning bolts 505 are respectively threadedly penetrated through the outer wall of the limit plate 504. One end of the positioning bolt 505 passes through the limit plate 504 and is threadedly penetrated through the outer wall of the pushing frame 303. The limit plate 504 is used to limit the sliding range of the movable plate 502 to prevent the movable plate 502 from excessively sliding under the action of the compression spring 503 and disengaging from the guide groove 501, thereby ensuring the reliability and stability of the support mechanism 5 and ensuring that the movable plate 502 can always work normally in the guide groove 501 during the entire working process, providing stable support for the acrylic plate. Tightening the positioning bolt 505 can firmly fix the limit plate 504 on the pushing frame 303, further enhancing the limiting effect of the limit plate 504 on the movable plate 502, and also facilitating the installation and disassembly of the limit plate 504, so as to facilitate the maintenance and adjustment of the support mechanism 5.

[0027] In the above embodiment, as a preferred scheme, a limiting mechanism 6 is provided on the outer wall of the fixed plate 506, and the limiting mechanism 6 includes a clamping plate 601 and a pressure rod 602. The two clamping plates 601 are fixedly connected to the outer wall of the fixed plate 506, and the pressure rod 602 is threadedly penetrated through the top of the clamping plate 601 and is used to clamp and position the edge of the acrylic plate to prevent the acrylic plate from lateral displacement during the lifting and bending process and ensure the accuracy of the bending position. The position and clamping force of the clamping plate 601 need to be reasonably designed according to the size and thickness of the acrylic plate to ensure that the acrylic plate can be effectively fixed without causing damage to its surface. The clamping pressure of the clamping plate 601 on the acrylic plate can be adjusted by rotating the pressure rod 602 to adapt to the processing requirements of acrylic plates of different thicknesses and materials. Under the premise of ensuring that the acrylic plate is fixed and stable, reasonable clamping pressure can avoid leaving indentations or damage on the surface of the acrylic plate due to excessive pressure, thereby further improving the processing quality of the product.

[0028] In the present invention, the working steps of the device are as follows: 1. First, according to the bending requirements of the acrylic plate, determine the position of the limit rod 206 on the support plate 203, select the appropriate fixing hole 204 on the support plate 203, and use the connecting rod 205 and bolts to install and fix the limit rod 206 so that the blocking mechanism 2 can meet the specific bending angle and shape requirements, adjust the position of the heating mechanism 4, manually push the push rod 404 of the heating mechanism 4, and make the adjustment plate 401 slide on the top of the fixing frame 301, so as to drive the fixing seat 402 and the heating plate 403 to the part of the acrylic plate that needs to be heated, so as to meet the requirements of different bending shapes and sizes for the heating position; 2. Secondly, place the acrylic sheet on the push frame 303 of the lifting mechanism 3, so that the acrylic sheet is located on the movable plate 502 of the supporting mechanism 5. At this time, the movable plate 502 will automatically adjust its position according to the thickness of the acrylic sheet under the action of the compression spring 503, and the heating plate 403 will be powered to heat the specific part of the acrylic sheet, so that the local area of ​​the acrylic sheet will be heated and softened, which is convenient for the subsequent bending operation; 3. Then, after the heating is completed, the hydraulic rod 302 is started. The hydraulic rod 302 outputs thrust according to the control signal, driving the push frame 303 to move upward. During the upward movement of the push frame 303, on the one hand, the acrylic plate is driven to move upward, so that it fits onto the limit rod 206, and is bent with the help of the limit rod 206; 4. Finally, after the bending operation is completed, the hydraulic rod 302 drives the push frame 303 to descend back to the initial position, loosens the pressure rod 602, takes out the bent acrylic plate, and prepares for the next bending operation.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An acrylic plate bending device, characterized in that: It comprises a support seat (1), a blocking mechanism (2), a lifting mechanism (3) and a heating mechanism (4), wherein: The blocking mechanism (2) comprises a support plate (203) and a limiting rod (206); the support plate (203) is detachably connected to the top of the support seat (1); and a plurality of limiting rods (206) are detachably connected to the outer wall of the support plate (203); The lifting mechanism (3) comprises a fixed frame (301), a hydraulic rod (302) and a pushing frame (303); the fixed frame (301) is fixedly mounted on the top of the support seat (1); a plurality of hydraulic rods (302) are respectively fixedly mounted below the fixed frame (301) and located on both sides of the support seat (1); and the bottom of the pushing frame (303) is fixedly connected to the output end of the hydraulic rod (302); The heating mechanism (4) can be slidably connected to the top of the fixing frame (301) to heat the acrylic plate.

2. The acrylic plate bending device according to claim 1, characterized in that: The blocking mechanism (2) further comprises a bracket (201) and fixing bolts (202), wherein a plurality of the fixing bolts (202) are respectively threadedly disposed at two ends of the outer surfaces of the two brackets (201), the lower end of the bracket (201) is connected to the outer wall of the support seat (1) via the fixing bolts (202), and the upper end of the bracket (201) is connected to the outer wall of the support plate (203) via the fixing bolts (202).

3. The acrylic plate bending device according to claim 2, characterized in that: The blocking mechanism (2) further comprises fixing holes (204) and connecting rods (205); a plurality of the fixing holes (204) are evenly arranged on the outer wall of the support plate (203); the connecting rods (205) are connected to the outer walls of the fixing holes (204) by means of bolts; and the end of the limiting rod (206) is threadedly connected to the end of the connecting rod (205).

4. The acrylic plate bending device according to claim 1, characterized in that: The heating mechanism (4) comprises an adjustment plate (401), a fixing seat (402) and a heating plate (403); the adjustment plate (401) is slidably connected to the top of the fixing frame (301); the fixing seat (402) is detachably connected to the top of the adjustment plate (401) by bolts; and the heating plate (403) is fixedly mounted on the top of the fixing seat (402).

5. The acrylic plate bending device according to claim 4, characterized in that: The heating mechanism (4) further comprises a push rod (404), wherein two push rods (404) are respectively fixedly mounted on two ends of the adjustment plate (401), and the outer surfaces of the push rods (404) are sleeved with protective sleeves.

6. The acrylic plate bending device according to claim 2, characterized in that: A support mechanism (5) is arranged on the top of the lifting mechanism (3), and the support mechanism (5) comprises a guide groove (501), a movable plate (502), a compression spring (503) and a fixed plate (506), wherein the two guide grooves (501) are arranged on both sides of the top of the pushing frame (303), the two movable plates (502) are respectively slidably connected to the inner walls of the two guide grooves (501), the two compression springs (503) are respectively slidably connected to the inner walls of the two guide grooves (501), and the two ends of the fixed plate (506) are respectively rotatably connected to the outer walls of the two movable plates (502) via a rotating shaft.

7. The acrylic plate bending device according to claim 6, characterized in that: The support mechanism (501) further comprises a limit plate (504) and positioning bolts (505); the limit plate (504) is detachably connected to the two ends of the pushing frame (303); a plurality of positioning bolts (505) are respectively threadedly inserted into the outer wall of the limit plate (504); and one end of the positioning bolt (505) passing through the limit plate (504) is threadedly inserted into the outer wall of the pushing frame (303).

8. The acrylic plate bending device according to claim 6, characterized in that: The outer wall of the fixed plate (506) is provided with a limiting mechanism (6), the limiting mechanism (6) comprising a clamping plate (601) and a pressure rod (602), the two clamping plates (601) are fixedly connected to the outer wall of the fixed plate (506), and the pressure rod (602) is threadedly penetrated through the top of the clamping plate (601).

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