A winding device for flame retardant fabrics

Abstract

The invention relates to the field of flame retardant fabric winding, and discloses a flame retardant fabric winding device, comprising a bottom plate and a winding roller, wherein two vertical plates are installed at the upper left edge of the bottom plate, a winding roller is rotatably installed between the two vertical plates, a first motor is installed at the top end of the rear side surface of the rear vertical plate, one end of the first motor output shaft is connected to the winding roller, and a transmission structure is arranged at the upper right edge of the bottom plate. When the winding roller winds up the fabric of the corresponding length and needs to continue winding, only one group of clamping and cutting structures needs to be used to cut and clamp the remaining fabric, and then the driving structure is used to drive the rotation of the clamping and cutting structure to continue the fabric winding work. At the same time, after the corresponding clamping and cutting structure has completed the winding, another group of clamping and cutting structures can be used to continue the winding, so that the operation is more labor-saving and convenient, and the work efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of flame retardant fabric winding, in particular to a flame retardant fabric winding device. Background Art

[0002] Flame retardant fabrics are flame retardant fabrics, which are special fabrics that can delay the burning of flames. Flame retardant fabrics are divided into post-finishing flame retardant and raw yarn flame retardant. When winding flame retardant fabrics, winding equipment is required.

[0003] The flame-retardant fabric winding device in the prior art can effectively adsorb and clean the debris remaining on the surface of the flame-retardant composite fiber fabric by setting an air suction pump. The debris adsorbed on the bottom of the flame-retardant composite fiber fabric can enter the cleaning box in the collection box through the cleaning plate. At the same time, the debris on the top of the flame-retardant composite fiber fabric can enter the inside of the sewage pipe and be discharged to the outside. The adjacent side edges of the cleaning box and the cleaning plate are both set to arc edges, achieving a better fabric surface adsorption effect;

[0004] However, after the winding roller has wound up the flame-retardant fabric of the corresponding length, when it is necessary to continue winding, the conveyed fabric needs to be cut manually, and then a new winding roller needs to be replaced, and one end of the cut fabric needs to be manually wound around the winding roller, and then the winding work can be continued by rotating the winding roller. This operation is cumbersome and reduces the efficiency of the winding work. Therefore, there is room for improvement. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a winding device for flame retardant fabrics.

[0006] The present invention provides a flame retardant fabric winding device that adopts the following technical solution:

[0007] A winding device for flame-retardant fabrics, comprising a bottom plate and a winding roller, two vertical plates are installed at the left edge of the top of the bottom plate, a winding roller is rotatably installed between the two vertical plates, a first motor is installed at the top of the rear side of the vertical plate on the rear side, one end of the output shaft of the first motor is connected to the winding roller, a transmission structure is arranged at the right edge of the top of the bottom plate, and a clamping and cutting structure is arranged near the middle of the top of the bottom plate;

[0008] The clamping and cutting structure includes side plates installed on the front and rear edges of the bottom plate, and two groups of lifting blocks are arranged on the two side plates through a lifting structure, and each lifting block is installed with a U-shaped plate, and a winding disk is arranged on the U-shaped plate through a driving structure. Two radial grooves are provided on a side surface of the winding disk away from the side plate, and guide rods are connected to the left and right edges of the groove walls at the upper and lower ends of each radial groove, and a moving block is movably sleeved on each group of two guide rods, and a cylinder is installed at the upper and lower edges of the winding disk. One end of the cylinder output shaft is connected to the corresponding moving block, an upper roller is arranged between the two upper moving blocks in each group, and a lower roller is arranged between the two lower moving blocks in each group, both ends of the upper roller and the lower roller are respectively installed on the moving block through the mounting structure, a cutting knife is installed at one edge below the upper roller, a second groove is provided at the left edge of the side where the upper roller and the lower roller are close to each other, a guide structure is provided in the middle of one side where the upper roller and the lower roller are close to each other, and a clamping structure is provided at the other edge where the upper roller and the lower roller are close to each other.

[0009] Preferably, the mounting structure includes fixed plates respectively connected to both ends of the upper roller and the lower roller, a first groove is provided on the rear end of the rear fixing plate, an insert tube is movably sleeved on the first groove, a second spring is connected between one end of the rear fixing plate and the inner end groove wall of the insert tube, a mounting block is installed on each of the moving blocks, a mounting groove is provided on a side surface of the mounting block away from the side plate, the front fixing plate is movably inserted into the corresponding mounting groove, one end of the insert tube is movably inserted into the corresponding mounting groove, the end faces of the fixing plate and the insert tube are both square, and convex strips are installed on the edges of the upper and lower side surfaces of the insert tube.

[0010] Preferably, the driving structure includes a rotating shaft fixedly connected to the middle of a side surface of the winding disk close to the side plate, the rear end of the rotating shaft on the rear side is rotatably connected to the corresponding lifting block, and a second motor is installed in the U-shaped plate on the front side, and the output shaft of the second motor is connected to the corresponding rotating shaft.

[0011] Preferably, the guide structure includes a storage groove opened in the middle of a side surface where the upper roller and the lower roller are close to each other, telescopic rods are installed at both ends of the inner groove wall of the storage groove, and a first spring is sleeved on the telescopic rod, and the two ends of the first spring are respectively connected to the U-shaped frame and the groove wall of the storage groove, and one end of the telescopic rod is connected to the U-shaped frame, and a fixed shaft is rotatably passed through the U-shaped frame, and a movable roller is rotatably sleeved on the fixed shaft.

[0012] Preferably, the clamping structure comprises a clamping strip installed on the right edge of the upper side of the lower roller, and a clamping groove is provided on the lower side of the upper roller just above the clamping strip.

[0013] Preferably, the lifting structure includes two vertical grooves provided on each of the side panels, the lifting blocks are slidably arranged in the corresponding vertical grooves, a first screw is rotatably inserted into the two vertical grooves on the front side, a threaded groove for the first screw to pass through is provided on the corresponding lifting blocks, a first turntable is fixedly installed on the top of the first screw, a vertical rod is connected between the upper and lower end groove walls of the two vertical grooves on the rear side, and a through hole for the vertical rod to movably pass through is provided on the corresponding lifting blocks.

[0014] Preferably, the transmission structure includes a U-shaped frame installed on the right edge of the bottom plate, two transmission shafts are rotatably connected between the front and rear inner walls of the U-shaped frame, transmission rollers are fixedly sleeved in the middle of the two transmission shafts, and an anti-bias structure is provided on the U-shaped frame.

[0015] Preferably, the anti-deflection structure includes a fixed frame fastened by bolts at the front and rear edges of the left side of the U-shaped frame, a movable plate is arranged in the fixed frame, and anti-deflection frames are installed on both ends of the movable plate that movably passes through the fixed frame, and a second screw is rotated and passed through the middle of a side surface away from each other by the two fixed frames, the second screw passes through a threaded groove provided on the movable plate, and a second turntable is installed on one end of the second screw.

[0016] In summary, the present invention includes the following beneficial technical effects:

[0017] The present invention is provided with two groups of clamping and cutting structures, a lifting structure and a driving structure. When the winding roller winds up the fabric of the corresponding length and needs to continue to wind up, only one group of the clamping and cutting structures needs to be used to cut and clamp the remaining fabric, and then the driving structure is used to drive the rotation of the clamping and cutting structure to continue the winding of the fabric. At the same time, after the corresponding clamping and cutting structure is wound up, the other group of clamping and cutting structures can be used to continue winding up, which is more labor-saving and convenient to operate, and greatly improves the work efficiency. Moreover, the height of the two groups of clamping and cutting structures can be flexibly adjusted through the provided lifting structure, so that the fabric passes between the two movable rollers in each group of clamping and cutting structures, and the tension of the fabric in the winding process can be flexibly adjusted.

[0018] The present invention is provided with a clamping structure, and after the upper roller and the lower roller are combined to cut the fabric, one end of the remaining fabric can be clamped, and the winding work can be smoothly continued;

[0019] The present invention is provided with a mounting structure, so that the upper roller and the lower roller after the fabric is rolled up can be disassembled or replaced as a whole;

[0020] The present invention is provided with a transmission structure and an anti-deviation structure, so that the fabric can be guided during winding, and the problem of front and rear deviation of the fabric can be reduced, thereby improving the quality of winding work. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a winding device for flame-retardant fabrics in an embodiment of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a U-shaped frame in an embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of a side plate in an embodiment of the present invention;

[0024] Figure 4 2 is a schematic diagram of the structure of the upper roller and the lower roller in an embodiment of the present invention;

[0025] Figure 5 In the embodiment of the present invention Figure 4 A magnified view of the structure at A;

[0026] Figure 6 2 is a schematic diagram of the structure of the lower side of the upper roller in an embodiment of the present invention;

[0027] Figure 7 In the embodiment of the present invention Figure 6 A magnified view of the structure at B;

[0028] Figure 8 It is a schematic structural diagram of the upper surface of the lower roller in an embodiment of the present invention.

[0029] Description of reference numerals: 1, bottom plate; 2, vertical plate; 3, winding roller; 4, first motor; 5, side plate; 6, lifting block; 7, U-shaped plate; 8, winding disk; 9, upper roller; 10, lower roller; 11, cylinder; 12, radial groove; 13, moving block; 14, guide rod; 15, mounting block; 16, fixing plate; 17, first groove; 18, inserting cylinder; 19, mounting groove; 20, convex strip; 21, rotating shaft; 22, second motor; 23 , storage groove; 24, movable roller; 25, cutting knife; 26, second groove; 27, clamping strip; 28, clamping groove; 29, telescopic rod; 30, U-shaped frame; 31, fixed axis; 32, first spring; 33, vertical groove; 34, first screw; 35, first turntable; 36, U-shaped frame; 37, transmission shaft; 38, transmission roller; 39, fixed frame; 40, movable plate; 41, second screw; 42, second turntable; 43, anti-bias frame. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-Figure 8 The present invention is described in further detail.

[0031] Reference Figure 1-Figure 8The embodiment of the present invention discloses a winding device for flame-retardant fabrics, including a bottom plate 1 and a winding roller 3, two vertical plates 2 are installed at the left edge of the top of the bottom plate 1, and the winding roller 3 is rotatably installed between the two vertical plates 2, a first motor 4 is installed at the top of the rear side of the rear vertical plate 2, one end of the output shaft of the first motor 4 is connected to the winding roller 3, a transmission structure is arranged at the right edge of the top of the bottom plate 1, and a clamping and cutting structure is arranged near the middle of the top of the bottom plate 1;

[0032] The clamping and cutting structure includes side plates 5 installed on the front and rear edges of the bottom plate 1, two groups of lifting blocks 6 are arranged on the two side plates 5 through a lifting structure, each lifting block 6 is installed with a U-shaped plate 7, and a winding disk 8 is arranged on the U-shaped plate 7 through a driving structure. Two radial grooves 12 are provided on a side surface of the winding disk 8 away from the side plate 5, and guide rods 14 are connected to the left and right edges of the groove walls at both ends of the upper and lower ends of each radial groove 12. A moving block 13 is movably sleeved on each group of two guide rods 14, and a cylinder 11 is installed on the upper and lower edges of the winding disk 8. One end of the output shaft of the cylinder 11 is connected to the corresponding moving block 13, an upper roller 9 is arranged between the two upper moving blocks 13 of each group, and a lower roller 10 is arranged between the two lower moving blocks 13 of each group, and the two ends of the upper roller 9 and the lower roller 10 are respectively installed on the moving block 13 through a mounting structure, and a cutting knife is installed on one edge below the upper roller 9. 25. A second groove 26 is provided at the left edge of the side where the upper roller 9 and the lower roller 10 are close to each other. A guide structure is provided in the middle of the side where the upper roller 9 and the lower roller 10 are close to each other. A clamping structure is provided at the edge of the other side where the upper roller 9 and the lower roller 10 are close to each other. After the winding roller 3 rotates and winds up the corresponding length of the fabric, the two groups of cylinders 11 closest to the winding roller 3 can be directly started. The cylinders 11 drive the upper roller 9 and the lower roller 10 to move toward the side close to each other. While clamping the fabric, the upper roller 9 and the lower roller 10 drive the cutting knife 25 to cut the fabric. After cutting, the second motor 22 can be directly started to drive the upper roller 9 and the lower roller 10 merged together to rotate as a whole to continue the winding work. After the first group of upper rollers 9 and the lower rollers 10 have rolled up the corresponding length of the fabric, another group of upper rollers 9 and the lower rollers 10 can be used to continue the winding work, which greatly improves the winding work efficiency.

[0033] See also Figure 1-Figure 8The mounting structure includes a fixing plate 16 connected to both ends of the upper roller 9 and the lower roller 10, a first groove 17 is provided on the rear end of the rear fixing plate 16, an inserting tube 18 is movably sleeved on the first groove 17, a second spring is connected between one end of the rear fixing plate 16 and the inner end groove wall of the inserting tube 18, a mounting block 15 is installed on each moving block 13, a mounting groove 19 is provided on one side of the mounting block 15 away from the side plate 5, the front fixing plate 16 is movably inserted into the corresponding mounting groove 19, one end of the inserting tube 18 is movably inserted into the corresponding mounting groove 19, the end faces of the fixing plate 16 and the inserting tube 18 are both square-shaped, and the upper and lower ends of the inserting tube 18 are connected to the fixing plate 16. The edges of the side surfaces are all provided with convex strips 20. During installation, one end of one of the fixed plates 16 can be inserted into the corresponding installation groove 19, and under the elastic force of the second spring, the inserting tube 18 can be pushed to move on the other fixed plate 16 and inserted into the installation groove 19 on the corresponding installation block 15, so that the upper roller 9 and the lower roller 10 can be installed. During disassembly, one end of the inserting tube 18 can be pulled out from the corresponding installation groove 19 through the convex strips 20, and then one end of the other fixed plate 16 can be pulled out from the corresponding installation groove 19, so that the upper roller 9 and the lower roller 10 can be disassembled, so that the installation or disassembly of the upper roller 9 and the lower roller 10 is simpler and more convenient.

[0034] The driving structure includes a rotating shaft 21 fixedly connected to the middle of a side surface of the winding disk 8 close to the side plate 5, the rear end of the rotating shaft 21 on the rear side is rotatably connected to the corresponding lifting block 6, a second motor 22 is installed in the U-shaped plate 7 on the front side, and the output shaft of the second motor 22 is connected to the corresponding rotating shaft 21. When the combined upper roller 9 and lower roller 10 clamp and cut the fabric, the second motor 22 can be started to drive the upper roller 9 and the lower roller 10 to rotate as a whole to continue the winding work;

[0035] The guide structure includes a storage groove 23 provided in the middle of one side surface where the upper roller 9 and the lower roller 10 are close to each other. Telescopic rods 29 are installed at both ends of the inner groove wall of the storage groove 23. A first spring 32 is sleeved on the telescopic rod 29. The two ends of the first spring 32 are respectively connected to the U-shaped frame 30 and the groove wall of the storage groove 23. One end of the telescopic rod 29 is connected to the U-shaped frame 30. A fixed shaft 31 is rotatably passed through the U-shaped frame 30. A movable roller 24 is rotatably sleeved on the fixed shaft 31. The fabric is passed between each group of two movable rollers 24, which can guide the fabric. At the same time, after the upper roller 9 and the lower roller 10 are combined, the two movable rollers 24 can be driven to clamp the fabric.

[0036] The clamping structure includes a clamping strip 27 installed on the right edge of the lower roller 10, and a clamping groove 28 is provided under the upper roller 9 at a position just above the clamping strip 27. The combined upper roller 9 and the lower roller 10 can drive the clamping strip 27 to be inserted into the clamping groove 28, so that the cut fabric is clamped more firmly, and one end of the fabric is prevented from falling off between the upper roller 9 and the lower roller 10 when the upper roller 9 and the lower roller 10 are rotated and rolled up as a whole;

[0037] The lifting structure includes two vertical slots 33 provided on each side plate 5, and the lifting block 6 is slidably arranged in the corresponding vertical slots 33. A first screw rod 34 is rotatably inserted into the two vertical slots 33 on the front side, and a threaded groove for the first screw rod 34 to pass through is provided on the corresponding lifting block 6. A first turntable 35 is fixedly installed on the top of the first screw rod 34. A vertical rod is connected between the upper and lower end groove walls of the two vertical slots 33 on the rear side, and a through hole for the vertical rod to pass through is provided on the corresponding lifting block 6. When the first screw rod 34 is rotated by the first turntable 35, the lifting block 6 is driven to move on the first screw rod 34, and the two groups of upper rollers 9 and lower rollers 10 are respectively moved to different height positions. In this way, when the fabric passes through the two groups of movable rollers 24, it can not only guide the winding of the fabric, but also adjust the tension generated in the process of winding the fabric according to the actual needs, so that it is more flexible to use.

[0038] See also Figure 1 and Figure 2 The transmission structure includes a U-shaped frame 36 installed on the right edge of the bottom plate 1, and two transmission shafts 37 are rotatably connected between the front and rear inner walls of the U-shaped frame 36. The middle of the two transmission shafts 37 are fixedly sleeved with transmission rollers 38, and an anti-deflection structure is provided on the U-shaped frame 36;

[0039] The anti-bias structure includes a fixed frame 39 fastened by bolts at the front and rear edges of the left side of the U-shaped frame 36, a movable plate 40 is arranged in the fixed frame 39, and anti-bias frames 43 are installed on both ends of the movable plate 40 that movably passes through the fixed frame 39, and a second screw 41 is rotated and passed through the middle of one side of the two fixed frames 39 away from each other, and the second screw 41 passes through a threaded groove provided on the movable plate 40, and a second turntable 42 is installed on one end of the second screw 41. Before winding, the fabric is passed between the two transmission rollers 38, and the second screw 41 is rotated by the second turntable 42 according to the width of the fabric. The movable plate 40 drives the anti-bias frame 43 to move on the rotating second screw 41, and moves the anti-bias frame 43 to the edge of the fabric, thereby playing an anti-bias role.

[0040] The implementation principle of a winding device for flame-retardant fabrics in an embodiment of the present invention is as follows: first, according to the actual thickness of the fabric, the second turntable 42 is used to rotate the second screw 41 on the fixed frame 39, and the movable plate 40 drives the anti-bias frame 43 to move on the rotating second screw 41 to move the anti-bias frame 43 to the edge of the fabric passing through the two transmission rollers 38, and then one end of the fabric is passed through the two groups of movable rollers 24, and then one end of the fabric is wound onto the winding roller 3, and then the first turntable 35 is used to rotate the first screw 34, and the lifting block 6 moves on the rotating first screw 34, so that the two groups of upper rollers 9 and lower rollers 10 are moved as a whole to different height positions to adjust the tension of the fabric during the winding process, and then, the first motor 4 is started to drive the winding roller 3 to rotate to wind the fabric, and when the winding roller 3 winds up the fabric of the corresponding length, the winding roller 3 is wound up. The winding roller 3 stops rotating and rewinding, and directly starts a group of cylinders 11 closest to the winding roller 3. The cylinder 11 drives the upper roller 9 and the lower roller 10 to move in a direction approaching each other. When the upper roller 9 and the lower roller 10 are merged together, the clamping strip 27 clamps the fabric in the clamping groove 28, and the cutting knife 25 cuts the fabric. The opening of the second groove 26 on the upper roller 9 and the lower roller 10 can reserve a pulling-out space for the fabric, so that the fabric on the winding roller 3 can be directly pulled out from between the upper roller 9 and the lower roller 10, and then the second motor 22 is started to drive the merged upper roller 9 and the lower roller 10 to rotate as a whole to continue the winding work. After the corresponding length of fabric is wound on the corresponding group of upper rollers 9 and the lower rollers 10, another group of upper rollers 9 and the lower rollers 10 can be directly used to continue the fabric winding work. This makes the operation simpler and more convenient, and also improves the work efficiency.

[0041] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A winding device for flame retardant fabrics, comprising a bottom plate and a winding roller, characterized in that: Two vertical plates are installed at the left edge of the upper part of the bottom plate, a winding roller is rotatably installed between the two vertical plates, a first motor is installed at the top of the rear side surface of the rear vertical plate, one end of the output shaft of the first motor is connected to the winding roller, a transmission structure is arranged at the right edge of the upper part of the bottom plate, and a clamping and cutting structure is arranged near the middle of the upper part of the bottom plate; The clamping and cutting structure includes side plates installed on the front and rear edges of the bottom plate, and two groups of lifting blocks are arranged on the two side plates through a lifting structure, and each lifting block is installed with a U-shaped plate, and a winding disk is arranged on the U-shaped plate through a driving structure. Two radial grooves are provided on a side surface of the winding disk away from the side plate, and guide rods are connected to the left and right edges of the groove walls at the upper and lower ends of each radial groove, and a moving block is movably sleeved on each group of two guide rods, and a cylinder is installed at the upper and lower edges of the winding disk. One end of the cylinder output shaft is connected to the corresponding moving block, an upper roller is arranged between the two upper moving blocks of each group, and a lower roller is arranged between the two lower moving blocks of each group, and both ends of the upper roller and the lower roller are respectively installed on the moving block through the mounting structure, a cutting knife is installed at one edge below the upper roller, a second groove is provided at the left edge of the side where the upper roller and the lower roller are close to each other, a guide structure is provided in the middle of the side where the upper roller and the lower roller are close to each other, and a clamping structure is provided at the other edge where the upper roller and the lower roller are close to each other; The mounting structure comprises a fixing plate connected to both ends of the upper roller and the lower roller respectively, a first groove is provided on the rear end of the fixing plate on the rear side, an insert sleeve is movably sleeved on the first groove, a second spring is connected between one end of the fixing plate on the rear side and the groove wall at the inner end of the insert sleeve, a mounting block is installed on each of the moving blocks, a mounting groove is provided on a side surface of the fixing block away from the side plate, the fixing plate on the front side is movably inserted into the corresponding mounting groove, and one end of the insert sleeve is movably inserted into the corresponding mounting groove, the end faces of the fixing plate and the insert sleeve are both square-shaped, and convex strips are installed on the edges of the upper and lower side faces of the insert sleeve; The driving structure includes a rotating shaft fixedly connected to the middle of a side surface of the winding disk close to the side plate, the rear end of the rotating shaft on the rear side is rotatably connected to the corresponding lifting block, and a second motor is installed in the U-shaped plate on the front side, and the output shaft of the second motor is connected to the corresponding rotating shaft; The guide structure includes a storage groove opened in the middle of a side surface where the upper roller and the lower roller are close to each other, telescopic rods are installed at both ends of the inner groove wall of the storage groove, a first spring is sleeved on the telescopic rod, and the two ends of the first spring are respectively connected to the U-shaped frame and the groove wall of the storage groove, one end of the telescopic rod is connected to the U-shaped frame, a fixed shaft is rotatably passed through the U-shaped frame, and a movable roller is rotatably sleeved on the fixed shaft.

2. The flame retardant fabric winding device according to claim 1, characterized in that: The clamping structure comprises a clamping strip installed on the right edge of the upper side of the lower roller, and a clamping groove is provided on the lower side of the upper roller at a position just above the clamping strip.

3. The flame retardant fabric winding device according to claim 1, characterized in that: The lifting structure includes two vertical slots provided on each of the side panels, the lifting blocks are slidably arranged in the corresponding vertical slots, a first screw rod is rotatably inserted into the two vertical slots on the front side, a threaded slot for the first screw rod to pass through is provided on the corresponding lifting block, a first turntable is fixedly installed on the top of the first screw rod, a vertical rod is connected between the upper and lower end slot walls of the two vertical slots on the rear side, and a through hole for the vertical rod to movably pass through is provided on the corresponding lifting block.

4. The flame retardant fabric winding device according to claim 1, characterized in that: The transmission structure includes a U-shaped frame installed on the right edge of the bottom plate, two transmission shafts are rotatably connected between the front and rear inner walls of the U-shaped frame, transmission rollers are fixedly sleeved in the middle of the two transmission shafts, and an anti-deflection structure is provided on the U-shaped frame.

5. The flame retardant fabric winding device according to claim 4, characterized in that: The anti-deflection structure includes a fixed frame fastened by bolts at the front and rear edges of the left side of the U-shaped frame, a movable plate is arranged in the fixed frame, and anti-deflection frames are installed on both ends of the movable plate that movably passes through the fixed frame, and a second screw rod is rotated and passed through the middle of a side surface away from each other. The second screw rod passes through a threaded groove provided on the movable plate, and a second turntable is installed on one end of the second screw rod.

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