Polyurethane foam processing and forming equipment

Abstract

The invention discloses polyurethane foam processing and forming equipment, and relates to the technical field of foam cutting machines. A moving mechanism is arranged below the working table, a cutting wire and a voltage controller are arranged above the working table, two limiting slideways which are symmetrically arranged left and right are formed in the working table, two ends of the cutting wire are connected with a secondary tap of the voltage controller, and a primary tap of the voltage controller is connected with an external power supply through a switch. The cleaning brush is used for scraping coking matter residues attached to the surface of the electric heating wire in real time, so that the electric heating wire for cutting the polyurethane foam is cleaned, meanwhile, the negative pressure pump forms negative pressure in the cleaning box through the spiral negative pressure pipe, the scraped residues are sucked into the cleaning and collecting cavity in time, the residues are prevented from falling off, a workbench and the to-be-cut polyurethane foam are prevented from being polluted, and the service life of the workbench is prolonged. The problem of secondary pollution caused by traditional manual cleaning is solved, the lifting height and the horizontal cutting path of the cutting wire can be accurately controlled through the lifting mechanism and the moving mechanism, the size precision of foam cutting is improved, and the cutting requirement is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foam cutting machines, and in particular to a polyurethane foam processing and forming device. BACKGROUND

[0002] Polyurethane foam is a kind of high polymer material with the characteristics of light weight, porosity, excellent elasticity, etc., and is widely used in furniture, packaging, building insulation, automotive interior and other fields. According to the requirements of different application scenarios, polyurethane foam is usually first made into a large foam board, and then further processed by a processing and forming device to cut it into standard boards of a certain thickness or special-shaped boards that meet the product design requirements, so as to meet the needs of subsequent production assembly or direct use. In the cutting process of polyurethane foam, the mainstream cutting method currently uses electric heating wire cutting technology, which uses the high temperature of the electric heating wire after being powered on to melt and separate the foam material, achieving precise cutting.

[0003] During the cutting process of polyurethane foam, the coking produced by the melting of the foam is easy to adhere to the surface of the electric heating wire. As the coking gradually accumulates, the heat transfer efficiency of the electric heating wire gradually decreases, thereby reducing the cutting precision and the quality of the cut, and even causing local overheating and fracture of the electric heating wire. The traditional cleaning method usually uses manual wiping to clean the electric heating wire. The debris falling off during the cleaning process is easy to fall on the workbench, not only polluting the workbench, but also adhering to the surface of the foam board to be cut, affecting the subsequent processing quality and product cleanliness, and bringing inconvenience to production. Therefore, the present application proposes a polyurethane foam processing and forming device to solve the above problems. SUMMARY

[0004] The purpose of the present application is to provide a polyurethane foam processing and forming device that solves the technical problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a polyurethane foam processing and forming device, comprising a workbench, a moving mechanism arranged below the workbench, a cutting wire and a voltage controller arranged above the workbench, two left-right symmetrical limiting slides arranged on the workbench, both ends of the cutting wire connected with the secondary tap of the voltage controller, and the primary tap of the voltage controller connected with an external power source through a switch. The moving mechanism comprises a moving frame, the moving frame is in the shape of U, and the upper ends of the left and right side walls of the moving frame are respectively penetrated through the two limiting slides and connected with a lifting mechanism. The lifting mechanism comprises two lifting frames, the two lifting frames are respectively fixedly connected with the upper ends of the left and right side walls of the moving frame, the inner side of the lifting frame is provided with a lifting block, and the position of the lifting block on the left side is provided with a cleaning mechanism.

[0006] Preferably, the cleaning mechanism comprises a negative pressure pump and a cleaning box, the input end of the negative pressure pump is connected with a spiral negative pressure pipe, the end of the spiral negative pressure pipe away from the negative pressure pump penetrates through the rear sidewall of the cleaning box and communicates with the cleaning box, the left and right sidewalls of the cleaning box are both provided with a through hole, the front inner wall of the cleaning box is fixedly connected with a cleaning plate, the cleaning plate is provided with a cleaning hole, the cutting wire is located at the inner side of the through hole and the cleaning hole, the inner sidewall of the cleaning hole is provided with a cleaning brush, and a connecting mechanism is arranged between the left lifting block and the cleaning box.

[0007] Preferably, the connecting mechanism comprises a connecting groove arranged in the right end of the left lifting block and a U-shaped clamping frame fixed to the left sidewall of the cleaning box, the left end of the clamping frame is open, the left and right sidewalls of the clamping frame are both fixedly connected with a clamping protrusion away from each other, and the left and right inner walls of the connecting groove are both provided with a clamping groove matched with the clamping protrusion.

[0008] Preferably, the inner side of the cleaning box is provided with a ventilation filter plate, the outer end of the ventilation filter plate is fixedly connected with the inner sidewall of the cleaning box, a cleaning collection cavity is formed between the ventilation filter plate and the front sidewall of the cleaning box, and the upper sidewall of the cleaning collection cavity is provided with a cleaning sealing cover.

[0009] Preferably, the lower inner wall of the lifting frame is fixedly connected with a limiting sliding rod two, the upper end of the limiting sliding rod two penetrates through the lifting block and is fixedly connected with the upper inner wall of the lifting frame, the lower inner wall of the lifting frame is rotatably connected with a lifting lead screw, the upper end of the lifting lead screw penetrates through the lifting block and the upper sidewall of the lifting frame in sequence and extends above the lifting frame, the upper end of the right lifting frame is fixedly connected with a lifting motor, the output end of the lifting motor is fixedly connected with the upper end of the right lifting lead screw, the lifting lead screw is threadedly connected with the lifting block, and the left and right lifting lead screws are driven by a belt.

[0010] Preferably, the front end of the lifting block is provided with a clamping groove, the clamping groove is provided with a clamping plate, the rear end of the clamping plate abuts against the rear inner wall of the clamping groove, the upper side of the lifting block is provided with a clamping bolt, and the lower end of the clamping bolt penetrates through the upper sidewall of the clamping groove and is rotatably connected with the upper end of the clamping plate.

[0011] Preferably, the lower inner wall of the clamping groove is provided with a matching groove, the lower end of the clamping plate is fixedly connected with a matching protrusion, the matching protrusion is matched with the matching groove, the lower end of the matching protrusion is provided with an abutting groove, and the cutting wire is located between the abutting groove and the matching groove.

[0012] Preferably, the moving mechanism further comprises two auxiliary plates fixed at the lower end of the workbench, the moving frame is located between the two auxiliary plates, the rear end of the rear auxiliary plate is fixedly connected with a moving motor, the output end of the moving motor penetrates through the rear auxiliary plate and is fixedly connected with a moving lead screw, the front end of the moving lead screw penetrates through the moving frame and is rotationally connected with the rear side wall of the front auxiliary plate, the moving lead screw is in threaded connection with the moving frame, the rear end of the front auxiliary plate is fixedly connected with a limiting slide rod one, and the rear end of the limiting slide rod one penetrates through the moving frame and is fixedly connected with the front end of the rear auxiliary plate.

[0013] Compared with the related art, the polyurethane foam processing and forming equipment provided by the application has the following beneficial effects: 1. The polyurethane foam processing and forming equipment provided by the application uses the cleaning brush to scrape off the coking residues attached to the surface of the electric heating wire in real time, thereby cleaning the electric heating wire for cutting the polyurethane foam. At the same time, the negative pressure pump forms negative pressure in the cleaning box through the spiral negative pressure pipe, thereby timely sucking the scraped residues into the cleaning and collecting cavity, avoiding the residues from falling and polluting the workbench and the polyurethane foam to be cut, and solving the secondary pollution problem of traditional manual cleaning.

[0014] 2. The polyurethane foam processing and forming equipment provided by the application uses the lifting mechanism to realize synchronous movement of the two lifting blocks by means of the lifting lead screw and the belt drive, and cooperates with the stable movement of the moving frame driven by the moving lead screw in the moving mechanism to accurately control the lifting height and horizontal cutting path of the cutting wire, effectively improves the size precision of foam cutting, and thereby meets the cutting demand.

[0015] 3. The polyurethane foam processing and forming equipment provided by the application uses the air-permeable filter plate in the cleaning box to prevent the residues from blocking the negative pressure pipe, and through the design of the cleaning sealing cover, the subsequent centralized treatment of the residues is facilitated, and the cleaning and maintenance cost is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the application; Figure 2 It is a schematic diagram of the overall structure of the application; Figure 1 It is a local enlarged view of A in the application; Figure 3 It is a local enlarged view of B in the application; Figure 1 It is a local enlarged view of B in the application; Figure 4 It is a schematic diagram of the moving mechanism of the application; Figure 5 It is a schematic diagram of the rear side view of the application; Figure 6 It is a local enlarged view of C in the application; Figure 5 It is a local enlarged view of C in the application; Figure 7 It is a schematic diagram of the lifting block of the application; Figure 8 For the cleaning box of the present application Figure 7 Local enlarged view at D in the middle; Figure 9 For the cleaning box of the present application Figure 10 For the cleaning box of the present application

[0017] Figure: 1, workbench; 2, moving mechanism; 201, auxiliary plate; 202, moving motor; 203, moving screw; 204, limit slide rod one; 205, moving frame; 3, lifting mechanism; 301, lifting frame; 302, lifting motor; 303, lifting screw; 304, limit slide rod two; 305, lifting block; 306, clamping groove; 307, clamping plate; 308, clamping bolt; 309, matching protrusion; 310, matching groove; 311, abutting groove; 4, voltage controller; 5, cutting wire; 6, limit slide; 7, connecting groove; 8, clamping groove; 9, cleaning mechanism; 901, cleaning box; 902, through hole; 903, air filter plate; 904, cleaning seal cover; 905, cleaning plate; 906, cleaning hole; 907, cleaning brush; 908, negative pressure pump; 909, spiral negative pressure pipe; 10, clamping frame; 11, clamping protrusion. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0019] Embodiment one: Please refer to Figures 1-10 The present application provides a technical solution: a polyurethane foam processing and forming equipment, comprising a workbench 1, a moving mechanism 2 arranged below the workbench 1, a cutting wire 5 and a voltage controller 4 arranged above the workbench 1, two limit slides 6 symmetrically arranged on the left and right of the workbench 1, both ends of the cutting wire 5 connected with the secondary tap of the voltage controller 4, and the primary tap of the voltage controller 4 connected with an external power source through a switch; The moving mechanism 2 comprises a moving frame 205, the moving frame 205 is in a U shape, and two limit slides 6 are arranged on the upper ends of the left and right side walls of the moving frame 205 and connected with a lifting mechanism 3; The lifting mechanism 3 comprises two lifting frames 301, the two lifting frames 301 are fixedly connected with the upper ends of the left and right side walls of the moving frame 205, a lifting block 305 is arranged on the inner side of the lifting frame 301, and a cleaning mechanism 9 is arranged at the position of the left lifting block 305; The cleaning mechanism 9 includes a negative pressure pump 908 and a cleaning box 901. The input end of the negative pressure pump 908 is connected to a spiral negative pressure pipe 909. The end of the spiral negative pressure pipe 909 furthest from the negative pressure pump 908 passes through the rear wall of the cleaning box 901 and communicates with it. Both the left and right side walls of the cleaning box 901 have through holes 902. A cleaning plate 905 is fixedly connected to the front inner wall of the cleaning box 901. Cleaning holes 906 are provided on the cleaning plate 905. Cutting wire 5 is located inside the through holes 902 and the cleaning holes 906. A cleaning brush 907 is provided on the inner wall of the cleaning hole 906. A left-side lifting block 30... A connecting mechanism is provided between the cutting wire 5 and the cleaning box 901. When the cutting wire 5 is used to cut polyurethane foam for a long time, a large amount of coking residue is easily attached to the surface of the cutting wire 5. At this time, the operator manually pulls the cleaning box 901 to the right and drags the cleaning box 901 to move on the cutting wire 5. This allows the cleaning brush 907 to scrape off the coking residue attached to the surface in real time. At the same time, the negative pressure pump 908 forms a negative pressure in the cleaning box 901 through the spiral negative pressure pipe 909, which promptly sucks the scraped residue into the cleaning collection chamber, preventing the residue from falling and contaminating the workbench 1 and the foam to be cut. This solves the problem of secondary pollution caused by traditional manual cleaning.

[0020] The connecting mechanism includes a connecting groove 7 opened on the right side of the left lifting block 305 and a U-shaped snap-fit ​​frame 10 fixed on the left side wall of the cleaning box 901. The snap-fit ​​frame 10 has an opening on the left side. Snap-fit ​​protrusions 11 are fixedly connected to the sides of the upper and lower side walls of the snap-fit ​​frame 10 that are far apart from each other. Snap-fit ​​grooves 8 are opened on the upper and lower inner walls of the connecting groove 7. The snap-fit ​​grooves 8 are adapted to the snap-fit ​​protrusions 11. By using the snap-fit ​​protrusions 11 on the snap-fit ​​frame 10 to cooperate with the snap-fit ​​grooves 8 on the inner side wall of the connecting groove 7, the cleaning box 901 is kept in a fixed position when the cutting wire 5 is not in use. A ventilation filter plate 903 is provided inside the cleaning box 901. The outer end of the ventilation filter plate 903 is fixedly connected to the inner wall of the cleaning box 901. A cleaning collection chamber is formed between the ventilation filter plate 903 and the front wall of the cleaning box 901. The ventilation filter plate 903 can prevent residue from clogging the spiral negative pressure pipe 909 and collect the cleaned impurities in the cleaning collection chamber. A cleaning sealing cover 904 is provided on the upper side wall of the cleaning collection chamber. The design of the cleaning sealing cover 904 facilitates the subsequent centralized treatment of residue and greatly reduces cleaning and maintenance costs.

[0021] Example 2: Please see Figures 1-8 As shown, based on Embodiment 1, the present invention provides a technical solution: A limiting slide rod 304 is fixedly connected to the lower inner wall of the lifting frame 301. The upper end of the limiting slide rod 304 passes through the lifting block 305 and is fixedly connected to the upper inner wall of the lifting frame 301. A lifting screw 303 is rotatably connected to the lower inner wall of the lifting frame 301. The upper end of the lifting screw 303 passes through the lifting block 305 and the upper wall of the lifting frame 301 in sequence and extends to the top of the lifting frame 301. A lifting motor 302 is fixedly connected to the upper end of the right lifting frame 301. The output end of the lifting motor 302 is fixedly connected to the upper end of the right lifting screw 303. The lifting screw 303 is threadedly connected to the lifting block 305. The two lifting screws 303 are driven by belt. The lifting motor 302 drives the two lifting screws 303 to rotate synchronously, thereby driving the two lifting blocks 305 to move synchronously in the vertical direction, which facilitates the adjustment of the position of the cutting wire 5 according to the usage requirements during cutting. The lifting block 305 has a clamping groove 306 at its front end, and a clamping plate 307 is installed inside the clamping groove 306. The rear end of the clamping plate 307 abuts against the rear inner wall of the clamping groove 306. A clamping bolt 308 is installed above the lifting block 305. The lower end of the clamping bolt 308 passes through the upper wall of the clamping groove 306 and is rotatably connected to the upper end of the clamping plate 307. A mating groove 310 is provided on the lower inner wall of the clamping groove 306, and a mating protrusion 309 is fixedly connected to the lower end of the clamping plate 307. The protrusion 309 is adapted to the mating groove 310. The lower end of the protrusion 309 is provided with an abutment groove 311. The cutting wire 5 is located between the abutment groove 311 and the mating groove 310. When replacing the cutting wire 5, the clamping bolt 308 can be loosened to pull out the cutting wire 5. The new cutting wire 5 is placed in the mating groove 310 and the clamping bolt 308 is rotated to drive the clamping plate 307 to move downward. The clamping operation of the cutting wire 5 can be achieved under the action of the clamping groove 306 and the mating groove 310.

[0022] The moving mechanism 2 also includes two auxiliary plates 201 fixed to the lower end of the workbench 1. The moving frame 205 is located between the two auxiliary plates 201. The rear end of the rear auxiliary plate 201 is fixedly connected to a moving motor 202. The output end of the moving motor 202 passes through the rear auxiliary plate 201 and is fixedly connected to a moving lead screw 203. The front end of the moving lead screw 203 passes through the moving frame 205 and is rotatably connected to the rear wall of the front auxiliary plate 201. The moving lead screw 203 is threadedly connected to the moving frame 205. The rear end of the front auxiliary plate 201 is fixedly connected to a limiting slide bar 204. The rear end of the limiting slide bar 204 passes through the moving frame 205 and is fixedly connected to the front end of the rear auxiliary plate 201. In use, the moving motor 202 drives the moving lead screw 203 to rotate. With the cooperation of the moving lead screw 203 and the moving frame 205, the cutting wire 5 and the lifting mechanism 3 move back and forth, thereby realizing the foam cutting operation using the cutting wire 5.

[0023] Working Principle: During use, the primary tap of the voltage controller 4 is connected to an external power supply via a switch, and the secondary tap is connected to both ends of the cutting wire 5. The voltage controller 4 can adjust the output voltage, thereby precisely controlling the heating level of the cutting wire 5, so that the cutting wire 5 reaches the melting and cutting temperature suitable for polyurethane foam of different thicknesses and hardnesses. The position of the cutting wire 5 can be adjusted by the lifting mechanism 3. During adjustment, the lifting motor 302 drives the two lifting screws 303 to rotate synchronously. With the cooperation of the lifting screws 303 and the lifting block 305, the cutting wire 5 is moved up and down, thereby adjusting the position of the cutting wire 5 according to the product thickness requirements. During cutting, the moving motor 202... The movable lead screw 203 rotates, and with the cooperation of the movable lead screw 203 and the movable frame 205, the movable frame 205 and the lifting mechanism 3 are adjusted, thereby enabling the cutting operation of polyurethane foam. After repeated use, a large amount of coking residue adheres to the surface of the cutting wire 5. At this time, the operator pulls the cleaning box 901 to the right, dragging the cleaning box 901 along the cutting wire 5. The cleaning brush 907 can scrape off the coking residue on the surface in real time. At the same time, the negative pressure pump 908 creates negative pressure in the cleaning box 901 through the spiral negative pressure pipe 909, which promptly sucks the scraped residue into the cleaning collection chamber, preventing the residue from falling and contaminating the workbench 1 and the foam to be cut, thus solving the secondary pollution problem of traditional manual cleaning. In addition, the air filter plate 903 in the cleaning box 901 can prevent the residue from clogging the negative pressure pipe, and the design of the cleaning sealing cover 904 facilitates the subsequent centralized treatment of residue, greatly reducing cleaning and maintenance costs.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A polyurethane foam processing and molding equipment, comprising a workbench (1), characterized in that: A moving mechanism (2) is provided below the workbench (1), and a cutting wire (5) and a voltage controller (4) are provided above the workbench (1). Two limit slides (6) are provided on the workbench (1) with left and right symmetrical arrangement. Both ends of the cutting wire (5) are connected to the secondary tap of the voltage controller (4). The primary tap of the voltage controller (4) is connected to an external power supply through a switch. The moving mechanism (2) includes a moving frame (205), which is U-shaped. The upper ends of the left and right side walls of the moving frame (205) are respectively connected to two limiting slides (6) and lifting mechanisms (3). The lifting mechanism (3) includes two lifting frames (301), which are fixedly connected to the upper ends of the left and right side walls of the mobile frame (205) respectively. A lifting block (305) is provided on the inner side of the lifting frame (301), and a cleaning mechanism (9) is provided at the position of the lifting block (305) on the left side.

2. The polyurethane foam processing and molding equipment according to claim 1, characterized in that: The cleaning mechanism (9) includes a negative pressure pump (908) and a cleaning box (901). The input end of the negative pressure pump (908) is connected to a spiral negative pressure pipe (909). The end of the spiral negative pressure pipe (909) away from the negative pressure pump (908) passes through the rear side wall of the cleaning box (901) and communicates with the cleaning box (901). Both the left and right side walls of the cleaning box (901) are provided with through holes (902). A cleaning plate (905) is fixedly connected to the front inner wall of the cleaning box (901). A cleaning hole (906) is provided on the cleaning plate (905). The cutting wire (5) is located inside the through hole (902) and the cleaning hole (906). A cleaning brush (907) is provided on the inner side wall of the cleaning hole (906). A connecting mechanism is provided between the lifting block (305) on the left side and the cleaning box (901).

3. The polyurethane foam processing and molding equipment according to claim 2, characterized in that: The connecting mechanism includes a connecting groove (7) opened on the right side of the left lifting block (305) and a U-shaped snap-fit ​​frame (10) fixed on the left side wall of the cleaning box (901). The left side of the snap-fit ​​frame (10) is open. Snap-fit ​​protrusions (11) are fixedly connected to the upper and lower side walls of the snap-fit ​​frame (10) on opposite sides. Snap-fit ​​grooves (8) are opened on the upper and lower inner walls of the connecting groove (7). The snap-fit ​​grooves (8) are adapted to the snap-fit ​​protrusions (11).

4. The polyurethane foam processing and molding equipment according to claim 2, characterized in that: The cleaning box (901) is provided with an air filter plate (903) inside. The outer end of the air filter plate (903) is fixedly connected to the inner wall of the cleaning box (901). A cleaning collection cavity is formed between the air filter plate (903) and the front wall of the cleaning box (901). A cleaning sealing cover (904) is provided on the upper side wall of the cleaning collection cavity.

5. The polyurethane foam processing and molding equipment according to claim 1, characterized in that: The lower inner wall of the lifting frame (301) is fixedly connected to a limiting slide rod two (304). The upper end of the limiting slide rod two (304) passes through the lifting block (305) and is fixedly connected to the upper inner wall of the lifting frame (301). The lower inner wall of the lifting frame (301) is rotatably connected to a lifting screw (303). The upper end of the lifting screw (303) passes through the lifting block (305) and the upper wall of the lifting frame (301) in sequence and extends to the top of the lifting frame (301). The upper end of the right lifting frame (301) is fixedly connected to a lifting motor (302). The output end of the lifting motor (302) is fixedly connected to the upper end of the right lifting screw (303). The lifting screw (303) is threadedly connected to the lifting block (305). The two lifting screws (303) on the left and right are driven by a belt.

6. The polyurethane foam processing and molding equipment according to claim 1, characterized in that: The lifting block (305) has a clamping groove (306) at its front end. A clamping plate (307) is provided in the clamping groove (306). The rear end of the clamping plate (307) abuts against the rear inner wall of the clamping groove (306). A clamping bolt (308) is provided above the lifting block (305). The lower end of the clamping bolt (308) passes through the upper side wall of the clamping groove (306) and is rotatably connected to the upper end of the clamping plate (307).

7. The polyurethane foam processing and molding equipment according to claim 6, characterized in that: The clamping groove (306) has a mating groove (310) on its lower inner wall. The clamping plate (307) has a mating protrusion (309) fixedly connected to its lower end. The mating protrusion (309) is adapted to the mating groove (310). The lower end of the mating protrusion (309) has an abutment groove (311). The cutting wire (5) is located between the abutment groove (311) and the mating groove (310).

8. The polyurethane foam processing and molding equipment according to claim 1, characterized in that: The moving mechanism (2) also includes two auxiliary plates (201) fixed at the lower end of the workbench (1). The moving frame (205) is located between the two auxiliary plates (201). The rear end of the rear auxiliary plate (201) is fixedly connected to a moving motor (202). The output end of the moving motor (202) passes through the rear auxiliary plate (201) and is fixedly connected to a moving screw (203). The front end of the moving screw (203) passes through the moving frame (205) and is rotatably connected to the rear wall of the front auxiliary plate (201). The moving screw (203) is threadedly connected to the moving frame (205). The rear end of the front auxiliary plate (201) is fixedly connected to a limiting slide bar (204). The rear end of the limiting slide bar (204) passes through the moving frame (205) and is fixedly connected to the front end of the rear auxiliary plate (201).

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