A tapping device for special-shaped plates

Abstract

The present invention belongs to the technical field of mechanical processing equipment, and relates to a tapping device for special-shaped plates, including: a processing table, an arch bracket, a tapping mechanism, a shifting mechanism, a translation screw slide, and a transverse slide rail. The transverse slide rail is provided with three first sliders that slide and cooperate with it and a plurality of first positioning grooves. The first slider is provided with a first latch that plugs and cooperates with the first positioning groove, two positioning mechanisms, and a pressing mechanism. The arch bracket and the shifting mechanism are arranged adjacently on the processing table, the tapping mechanism is arranged on the arch bracket, the translation screw slide is located directly below the arch bracket, the transverse slide rail is arranged on the translation screw slide, two positioning mechanisms and a pressing mechanism are respectively arranged on the three first sliders, and the pressing mechanism is located between the two positioning mechanisms. The present invention realizes automated tapping of various types of special-shaped plates, improves the tapping quality, and reduces the labor intensity of workers.

Description

Technical Field

[0001] The present invention relates to the technical field of machining equipment, and particularly relates to a tapping device for special-shaped plates. Background Art

[0002] A tapping machine is a machine tool for machining internal threads with a tap, and it is the most widely used internal thread machining machine tool. At present, the tapping of special-shaped plates is completed by manual tapping: marks are made at the positions where the special-shaped plates need to be tapped, and then workers perform manual tapping according to the marks. In this way, the worker must hold the special-shaped plate for positioning, which easily causes the special-shaped plate to shift during tapping, resulting in incorrect tapping positions, and also increases the labor intensity of the workers. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problems that when manually tapping a special-shaped plate, the special-shaped plate shifts during tapping, resulting in incorrect tapping positions, and also increasing the labor intensity of the workers, the present invention provides a tapping device for special-shaped plates. The position of the tapping mechanism on the arched bracket can be changed through a displacement mechanism, so as to automatically adjust the tapping position of the special-shaped plate. The head and tail of the special-shaped plate can be positioned through two positioning mechanisms, without the need for manual holding. The stability of the tapping of the special-shaped plate is ensured through a pressing mechanism. The present invention can perform automatic tapping on various types of special-shaped plates, improve the tapping quality, and reduce the labor intensity of the workers.

[0004] The present invention provides a tapping device for special-shaped plates, including: a processing table, an arched bracket, a tapping mechanism, a displacement mechanism for changing the position of the tapping mechanism on the arched bracket, a translation screw slide, a transverse slide rail. Three first sliders slidably engaged with the transverse slide rail and several first positioning grooves are provided on the transverse slide rail. A first pin is provided on the first slider, and the first pin is inserted and engaged with the first positioning groove. Two positioning mechanisms for positioning the special-shaped plate, and a pressing mechanism for pressing the tapping position on the bottom surface of the special-shaped plate. The arched bracket and the displacement mechanism are adjacent to each other and arranged on the processing table. The tapping mechanism is arranged on the arched bracket. The translation screw slide is located directly below the arched bracket. The transverse slide rail is arranged on the translation screw slide. The two positioning mechanisms and the pressing mechanism are respectively arranged on the three first sliders, and the pressing mechanism is located between the two positioning mechanisms.

[0005] Preferably, the tapping mechanism includes a mounting bracket, a guide rail is provided on the mounting bracket, a sliding frame slidably engaged with the guide rail, a pushing cylinder, and a tapping assembly. The pushing cylinder is arranged on the mounting bracket, and the output end of the pushing cylinder is fixedly connected to the sliding frame. The tapping assembly is arranged on the sliding frame.

[0006] Preferably, the shifting mechanism includes a second slider, a hinge shaft provided on one side of the second slider, a vertical frame, a first electric push rod, a hinge seat mounted on the output end of the first electric push rod, and a hinge rod. The upper end of the arched bracket is provided with a first arc-shaped groove slidably engaged with the second slider. The vertical frame is located beside the arched bracket. The first electric push rod is horizontally arranged on the top of the vertical frame. The two ends of the hinge rod are respectively hinged to the hinge seat and the hinge shaft. The mounting bracket is fixedly connected to the other side of the second slider.

[0007] Preferably, a stabilizing block is further mounted on the other side of the second slider. An auxiliary slider is provided on the stabilizing block. The upper end of the arched bracket is further provided with a second arc-shaped groove slidably engaged with the auxiliary slider. The mounting bracket is fixedly connected to the auxiliary slider.

[0008] Preferably, the positioning mechanism includes a second electric push rod, three positioning components, and an L-shaped bracket. The L-shaped bracket is provided with three moving grooves for the positioning components to move. The second electric push rod is vertically arranged on the top of the first slider. The bottom of the L-shaped bracket is fixedly connected to the output end of the second electric push rod. The three positioning components are respectively connected to the three moving grooves.

[0009] Preferably, the positioning component includes a moving rod. The rod body of the moving rod is provided with a second external thread and an adjusting handle engaged with the second external thread. The head end and the tail end of the moving rod are respectively provided with an adjusting ring and a limiting disc. The inner wall of the adjusting ring is provided with a plurality of limiting slots. The head end of the moving rod is provided with a plurality of limiting insertion strips inserted and matched with the limiting slots, a pressing spring, a U-shaped plate, and a lower pressing plate. The top of the lower pressing plate is provided with a sliding rod and a threaded rod. The threaded rod is provided with a first adjusting nut threadedly engaged therewith. The moving rod is arranged in the moving groove. The pressing spring is sleeved on the moving rod, and the two ends of the pressing spring respectively abut against the adjusting handle and the limiting disc at the tail end of the moving rod. The U-shaped plate is fixedly connected to the head end of the moving rod. The lower pressing plate is located inside the U-shaped plate. The position of the lower pressing plate can be adjusted by the first adjusting nut. Rubber layers are provided on the bottom of the lower pressing plate and the inner bottom side of the U-shaped plate.

[0010] Preferably, the pressing mechanism includes a third electric push rod and a supporting block. A rotating column is rotatably installed on the side wall of the supporting block. A number of second positioning grooves are provided on the rotating column. A second pin for positioning the rotating column is provided on the top of the supporting block. The front end of the rotating column is rotatably installed with a telescopic rod perpendicular to it. The rod body of the telescopic rod is provided with a second external thread and two second adjusting nuts threadedly engaged with the second external thread, and a rotating bracket. Two symmetrically arranged rotating shafts are provided inside the rotating bracket. Connecting legs are installed on the rotating shafts. Pressing rollers are installed on the connecting legs. A sleeve rotatably engaged with the rotating shaft is provided on the side wall of the rotating bracket. A number of third positioning grooves are provided on the rotating shaft. A third pin for positioning the rotating shaft is provided on the sleeve. The third electric push rod is arranged on the top of the first slider. The bottom of the supporting block is fixedly connected to the output end of the third electric push rod. The rotating bracket is arranged at the end of the telescopic rod.

[0011] The beneficial effects of the present invention are as follows:

[0012] First, for a tapping device for special-shaped plates of the present invention, the displacement mechanism can change the position of the tapping mechanism on the arched bracket, so as to automatically adjust the tapping position of the special-shaped plate. The two positioning mechanisms can position the head and tail of the special-shaped plate, without the need for manual holding. The pressing mechanism is used to ensure the stability of the tapping of the special-shaped plate. The present invention can perform automatic tapping on various types of special-shaped plates, improve the tapping quality, and reduce the labor intensity of workers.

[0013] Second, for a tapping device for special-shaped plates of the present invention, the first electric push rod drives the hinge seat to move, the hinge seat drives the hinge rod to move synchronously, and the hinge rod drives the second slider to move in the first arc-shaped groove through the hinge shaft, so as to change the position of the tapping mechanism, that is, change the tapping position of the special-shaped plate.

[0014] Third, for a tapping device for special-shaped plates of the present invention, the positioning mechanism can not only position and fix the special-shaped plate with an inclined head or tail end, but also position and fix the special-shaped plate with an arc-shaped head or tail end. Of course, it can also position and fix the special-shaped plate with a horizontal head or tail end, and its application range is relatively wide. Description of the Drawings

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1Schematic diagram of the present invention in three dimensions Figure 1 ,

[0017] Figure 2 Schematic diagram of the present invention in three dimensions Figure 2 ,

[0018] Figure 3 Partial schematic diagram of the present invention Figure 1 ,

[0019] Figure 4 Partial schematic diagram of the present invention Figure 2 ,

[0020] Figure 5 Schematic diagram of the positioning mechanism Figure 1 ,

[0021] Figure 6 is Figure 5 an enlarged view of position A in

[0022] Figure 7 Schematic diagram of the positioning mechanism Figure 2 ,

[0023] Figure 8 Schematic diagram of the pressing mechanism Figure 1 ,

[0024] Figure 9 Schematic diagram of the pressing mechanism Figure 2 ;

[0025] Reference numerals: processing table 1, arched bracket 2, first arc groove 21, second arc groove 22, tapping mechanism 3, mounting bracket 31, guide rail 32, sliding carriage 33, pushing cylinder 34, tapping assembly 35, shifting mechanism 4, second slider 41, hinge shaft 411, vertical frame 42, first electric push rod 43, hinge seat 431, hinge rod 44, stabilizing block 45, auxiliary slider 451, translation screw table 5, transverse slide rail 6, first slider 61, first positioning groove 62, first pin 63, positioning mechanism 7, second electric push rod 71, positioning component 72, moving rod 721, limiting insertion strip 7211, adjusting handle 722, adjusting ring 723, limiting insertion slot 7231, limiting disc 724, pressing spring 725, U-shaped plate 726, lower pressing plate 727, sliding rod 7271, threaded rod 7272, first adjusting nut 7273, rubber layer 728, L-shaped bracket 73, moving groove 731, pressing mechanism 8, third electric push rod 81, support block 82, second pin 821, rotating column 83, second positioning groove 831, telescopic rod 84, second adjusting nut 841, rotating bracket 85, sleeve 851, third pin 852, rotating shaft 86, third positioning groove 861, connecting leg 87, pressing roller 871. Detailed implementation manners

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0027] As shown in Figure 1-9 , a tapping device for special-shaped plates includes: a processing table 1, an arched bracket 2, a tapping mechanism 3, a displacement mechanism 4 for changing the position of the tapping mechanism 3 on the arched bracket 2, a translation screw slide 5, a transverse slide rail 6. There are three first sliders 61 slidably engaged with the transverse slide rail 6 and several first positioning grooves 62 on the transverse slide rail 6. A first pin 63 is provided on the first slider 61, and the first pin 63 is inserted and engaged with the first positioning groove 62. Two positioning mechanisms 7 for positioning the special-shaped plate and a pressing mechanism 8 for pressing the tapping position on the bottom surface of the special-shaped plate. The arched bracket 2 and the displacement mechanism 4 are adjacently arranged on the processing table 1. The tapping mechanism 3 is arranged on the arched bracket 2. The translation screw slide 5 is located directly below the arched bracket 2. The transverse slide rail 6 is arranged on the translation screw slide 5. The two positioning mechanisms 7 and the pressing mechanism 8 are respectively arranged on the three first sliders 61, and the pressing mechanism 8 is located between the two positioning mechanisms 7. The head and tail of the special-shaped plate can be positioned and fixed by the two positioning mechanisms 7, eliminating the need for workers to hold the special-shaped plate by hand. The special-shaped plate can be tapped by the tapping mechanism 3. The tapping angle of the tapping mechanism 3 can be adjusted by the displacement mechanism 4, improving the applicable range of tapping. The pressing mechanism 8 can cooperate with the tapping mechanism 3 to tap the special-shaped plate. The pressing mechanism 8 can prevent the special-shaped plate from undergoing micro-deformation during tapping. The positions of the two positioning mechanisms 7 and the pressing mechanism 8 are determined by the position of the first slider 61 on the transverse slide rail 6.

[0028] Preferably, there can also be two transverse slide rails 6, and the two transverse slide rails 6 are symmetrically arranged, so that larger special-shaped plates can be positioned and fixed. The tapping position of the special-shaped plate is adjusted and controlled by the translation screw slide 5.

[0029] In a specific embodiment, the tapping mechanism 3 includes a mounting bracket 31, a guide rail 32 is provided on the mounting bracket 31, a sliding frame 33 slidably engaged with the guide rail 32, a pushing cylinder 34, and a tapping assembly 35. The pushing cylinder 34 is arranged on the mounting bracket 31, and the output end of the pushing cylinder 34 is fixedly connected to the sliding frame 33. The tapping assembly 35 is arranged on the sliding frame 33. The pushing cylinder 34 can drive the mounting bracket 31 to move on the guide rail 32. The mounting bracket 31 drives the tapping assembly 35 to move synchronously, and the tapping assembly 35 completes tapping during the movement. The tapping assembly 35 is prior art, and the principle will not be elaborated here.

[0030] In a specific embodiment, the shifting mechanism 4 includes a second slider 41. One side of the second slider 41 is provided with a hinge shaft 411, a vertical frame 42, a first electric push rod 43. A hinge seat 431 is installed on the output end of the first electric push rod 43, and a hinge rod 44. The upper end of the arched bracket 2 is provided with a first arc-shaped groove 21 that slidably cooperates with the second slider 41. The vertical frame 42 is located beside the arched bracket 2. The first electric push rod 43 is horizontally arranged on the top of the vertical frame 42. The two ends of the hinge rod 44 are respectively hinged to the hinge seat 431 and the hinge shaft 411. The mounting bracket 31 is fixedly connected to the other side of the second slider 41. The first electric push rod 43 drives the hinge seat 431 to move. The hinge seat 431 drives the hinge rod 44 to move synchronously. The hinge rod 44 drives the second slider 41 to move in the first arc-shaped groove 21 through the hinge shaft 411, thereby changing the position of the tapping mechanism 3, that is, changing the tapping position of the special-shaped plate.

[0031] In a specific embodiment, a stabilizing block 45 is further installed on the other side of the second slider 41. An auxiliary slider 451 is provided on the stabilizing block 45. The upper end of the arched bracket 2 is further provided with a second arc-shaped groove 22 that slidably cooperates with the auxiliary slider 451. The mounting bracket 31 is fixedly connected to the auxiliary slider 451. The cooperation between the auxiliary slider 451 and the second arc-shaped groove 22 is used to increase the stability of the second slider 41 moving in the first arc-shaped groove 21.

[0032] In a specific embodiment, the positioning mechanism 7 includes a second electric push rod 71, three positioning components 72, and an L-shaped bracket 73. The L-shaped bracket 73 is provided with three moving grooves 731 for the positioning components 72 to move. The second electric push rod 71 is vertically arranged on the top of the first slider 61. The bottom of the L-shaped bracket 73 is fixedly connected to the output end of the second electric push rod 71. The three positioning components 72 are respectively connected to the three moving grooves 731. The second electric push rods 71 on the two positioning mechanisms 7 can adjust the corresponding L-shaped brackets 73 according to the height difference between the head and the tail of the special-shaped plate. The three positioning components 72 can position and fix the head and the tail of the special-shaped plate.

[0033] In a specific embodiment, the positioning component 72 includes a moving rod 721. The rod body of the moving rod 721 is provided with a second external thread and an adjusting handle 722 that mates with the second external thread. The head end and the tail end of the moving rod 721 are respectively provided with an adjusting ring 723 and a limiting disc 724. The inner wall of the adjusting ring 723 is provided with a plurality of limiting slots 7231. The head end of the moving rod 721 is provided with a plurality of limiting inserts 7211 that are inserted and mated with the limiting slots 7231, a pressing spring 725, a U-shaped plate 726, and a lower pressing plate 727. The top of the lower pressing plate 727 is provided with a sliding rod 7271 and a threaded rod 7272. A first adjusting nut 7273 that is threadedly mated with the threaded rod 7272 is provided on the threaded rod 7272. The moving rod 721 is arranged in a moving groove 731. The pressing spring 725 is sleeved on the moving rod 721, and the two ends of the pressing spring 725 respectively abut against the adjusting handle 722 and the limiting disc 724 at the tail end of the moving rod 721. The U-shaped plate 726 is fixedly connected to the head end of the moving rod 721. The lower pressing plate 727 is located inside the U-shaped plate 726. The lower pressing plate 727 can adjust its own position through the first adjusting nut 7273. Rubber layers 728 are provided on the bottom of the lower pressing plate 727 and the inner bottom side of the U-shaped plate 726; loosening the adjusting handle 722 can change the position of the moving rod 721 fixed in the moving groove 731. After moving, tighten the adjusting handle 722 again. Place the special-shaped plate between the U-shaped plate 726 and the lower pressing plate 727, and then turn the first adjusting nut 7273 to make the lower pressing plate 727 press the special-shaped plate tightly. Since the head and tail ends of the special-shaped plate may be inclined, the placement state of the U-shaped plate 726 also needs to be changed. The changing steps are still to loosen the adjusting handle 722 first, and then push the moving rod 721 forward through the limiting disc 724 until the limiting insert 7211 disengages from the corresponding limiting slot 7231. Immediately rotate the moving rod 721. After rotation, remove the pushing force so that the limiting insert 7211 can be inserted into the corresponding limiting slot 7231. The design of the pressing spring 725 mainly enables the limiting insert 7211 to automatically rebound into the limiting slot 7231 and can ensure the state of the U-shaped plate 726. Since the head and tail ends of the special-shaped plate may also be arc-shaped, rubber layers 728 are added to the lower pressing plate 727 and the U-shaped plate 726. The rubber layer 728 can not only change its own shape according to the shape of the special-shaped plate, but also ensure the stability of the head and tail fixation of the special-shaped plate.

[0034] In a specific embodiment, the pressing mechanism 8 includes a third electric push rod 81, a support block 82. A rotating column 83 is rotatably installed on the side wall of the support block 82. A plurality of second positioning grooves 831 are provided on the rotating column 83. A second pin 821 for positioning the rotating column 83 is provided at the top of the support block 82. The front end of the rotating column 83 is rotatably installed with a telescopic rod 84 perpendicular to it. The rod body of the telescopic rod 84 is provided with a second external thread and two second adjusting nuts 841 threadedly engaged with the second external thread, and a rotating bracket 85. Two symmetrically arranged rotating shafts 86 are provided inside the rotating bracket 85. Connecting legs 87 are installed on the rotating shafts 86. Pressing rollers 871 are installed on the connecting legs 87. A sleeve 851 rotatably engaged with the rotating shaft 86 is provided on the side wall of the rotating bracket 85. A plurality of third positioning grooves 861 are provided on the rotating shaft 86. A third pin 852 for positioning the rotating shaft 86 is provided on the sleeve 851. The third electric push rod 81 is arranged on the top of the first slider 61. The bottom of the support block 82 is fixedly connected to the output end of the third electric push rod 81. The rotating bracket 85 is arranged at the end of the telescopic rod 84; the overall height of the support block 82 can be changed by the third electric push rod 81. The rotation angle of the rotating column 83 is determined according to the tapping angle of the tapping mechanism 3. After the angle of the rotating column 83 is adjusted, it is positioned by the second pin 821. The distance that the telescopic rod 84 extends can be adjusted by the two second adjusting nuts 841, so as to ensure that the two pressing rollers 871 can contact the bottom surface of the special-shaped plate; the opening degree of the two connecting legs 87 can also be adjusted, and after adjustment, it can be done through the third pin 852, which improves the flexibility.

[0035] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tapping device for special-shaped plates, characterized in that it includes: a processing table (1), an arched bracket (2), a tapping mechanism (3), a displacement mechanism (4) for changing the position of the tapping mechanism (3) on the arched bracket (2), a translation screw rod slide (5), a transverse slide rail (6). Three first sliders (61) that are slidably engaged with the transverse slide rail (6) and several first positioning grooves (62) are provided on the transverse slide rail (6). A first pin (63) is provided on the first slider (61), and the first pin (63) is in plug-in fit with the first positioning groove (62), two positioning mechanisms (7) for positioning the special-shaped plate, and a pressing mechanism (8) for pressing the tapping position on the bottom surface of the special-shaped plate, The arched bracket (2) and the displacement mechanism (4) are adjacently arranged on the processing table (1). The tapping mechanism (3) is arranged on the arched bracket (2). The translation screw rod slide (5) is located directly below the arched bracket (2). The transverse slide rail (6) is arranged on the translation screw rod slide (5). The two positioning mechanisms (7) and the pressing mechanism (8) are respectively arranged on the three first sliders (61), and the pressing mechanism (8) is located between the two positioning mechanisms (7); The positioning mechanism (7) includes a second electric push rod (71), three positioning components (72), and an L-shaped bracket (73). Three moving grooves (731) for the positioning components (72) to move are provided on the L-shaped bracket (73), The second electric push rod (71) is vertically arranged at the top of the first slider (61). The bottom of the L-shaped bracket (73) is fixedly connected to the output end of the second electric push rod (71). The three positioning components (72) are respectively connected to the three moving grooves (731); The positioning component (72) includes a moving rod (721). The rod body of the moving rod (721) is provided with a second external thread and an adjusting handle (722) that cooperates with the second external thread. An adjusting ring (723) and a limiting disc (724) are respectively provided at the head end and the tail end of the moving rod (721). Several limiting slots (7231) are provided on the inner wall of the adjusting ring (723). Several limiting inserts (7211) that are in plug-in fit with the limiting slots (7231) are provided at the head end of the moving rod (721), a pressing spring (725), a U-shaped plate (726), and a lower pressing plate (727). A slide rod (7271) and a threaded rod (7272) are provided on the top of the lower pressing plate (727). A first adjusting nut (7273) that is in threaded fit with the threaded rod (7272) is provided on the threaded rod (7272), The moving rod (721) is arranged in the moving groove (731). The pressing spring (725) is sleeved on the moving rod (721), and both ends of the pressing spring (725) are in contact with the adjusting handle (722) and the limiting disc (724) at the tail end of the moving rod (721) respectively. The U-shaped plate (726) is fixedly connected to the head end of the moving rod (721). The lower pressing plate (727) is located inside the U-shaped plate (726). The lower pressing plate (727) can adjust its own position through the first adjusting nut (7273). Rubber layers (728) are provided on the bottom of the lower pressing plate (727) and the inner bottom side of the U-shaped plate (726).

2. The tapping device for special-shaped plates according to claim 1, characterized in that: The tapping mechanism (3) includes a mounting bracket (31). A guide rail (32) is provided on the mounting bracket (31). A sliding frame (33) that is slidably matched with the guide rail (32) is provided on the guide rail (32), a pushing cylinder (34), and a tapping assembly (35), The pushing cylinder (34) is arranged on the mounting bracket (31), and the output end of the pushing cylinder (34) is fixedly connected to the sliding frame (33). The tapping assembly (35) is arranged on the sliding frame (33).

3. The tapping device for special-shaped plates according to claim 2, characterized in that: The shifting mechanism (4) includes a second slider (41). A hinge shaft (411) is provided on one side of the second slider (41), a vertical frame (42), a first electric push rod (43). A hinge seat (431) is installed on the output end of the first electric push rod (43), and a hinge rod (44), The upper end of the arched bracket (2) is provided with a first arc-shaped groove (21) that is slidably matched with the second slider (41). The vertical frame (42) is located beside the arched bracket (2). The first electric push rod (43) is horizontally arranged on the top of the vertical frame (42). Both ends of the hinge rod (44) are hinged to the hinge seat (431) and the hinge shaft (411) respectively. The mounting bracket (31) is fixedly connected to the other side of the second slider (41).

4. The tapping device for special-shaped plates according to claim 3, characterized in that: A stabilizing block (45) is further installed on the other side of the second slider (41). An auxiliary slider (451) is provided on the stabilizing block (45). The upper end of the arched bracket (2) is further provided with a second arc-shaped groove (22) that is slidably matched with the auxiliary slider (451). The mounting bracket (31) is fixedly connected to the auxiliary slider (451).

5. The tapping device for special-shaped plates according to claim 1, characterized in that: The pressing mechanism (8) includes a third electric push rod (81), Support block (82), a rotating column (83) is rotatably installed on the side wall of the support block (82), a plurality of second positioning grooves (831) are provided on the rotating column (83), a second plug pin (821) for positioning the rotating column (83) is provided at the top of the support block (82), the front end of the rotating column (83) is rotatably installed with a telescopic rod (84) perpendicular to it, the rod body of the telescopic rod (84) is provided with a second external thread and two second adjusting nuts (841) threadedly engaged with the second external thread, and Rotating bracket (85), two symmetrically arranged rotating shafts (86) are provided inside the rotating bracket (85), connecting legs (87) are installed on the rotating shafts (86), pressing rollers (871) are installed on the connecting legs (87), a sleeve (851) rotatably engaged with the rotating shaft (86) is provided on the side wall of the rotating bracket (85), a plurality of third positioning grooves (861) are provided on the rotating shaft (86), and a third plug pin (852) for positioning the rotating shaft (86) is provided on the sleeve (851). The third electric push rod (81) is arranged on the top of the first slider (61), the bottom of the support block (82) is fixedly connected to the output end of the third electric push rod (81), and the rotating bracket (85) is arranged at the end of the telescopic rod (84).

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