High-precision optical fiber V-shaped groove etching device

Abstract

A high-precision optical fiber V-shaped groove etching device disclosed by the present invention comprises a main body unit and a clamping unit, the main body unit comprises a processing table, a U-shaped cover is fixed at the top of the processing table, a first stroke groove is formed in the top of the U-shaped cover, a suspension bracket is slidably connected in the first stroke groove, and a laser is installed at the bottom of the suspension bracket. The two mounting plates are staggered alternately, so that the clamping plates on the mounting plates clamp the optical fiber alternately, the etching of the optical fiber is continuous, the etching efficiency is improved, the optical fiber is always in a clamped state and does not need to be taken down, the etching position is always on the same straight line, and the adjustment time is saved; through the design of a third guide rod and a third guide rod, when the clamping plate clamps and fixes the optical fiber and the clamping plate tensions the optical fiber during movement, a second U-shaped plate slides on the third guide rod, so that the second U-shaped plate compresses a second spring, and the clamping plate is prevented from moving excessively and damaging the optical fiber.

Description

Technical Field

[0001] This invention relates to the field of fiber etching technology, and in particular to a high-precision fiber V-groove etching device. Background Technology

[0002] High-precision fiber optic V-grooves are primarily used for placing and precisely positioning optical fibers. Their processing accuracy directly affects the splicing accuracy of the fibers and the performance of optical splitters. With the ever-increasing performance requirements of optical communication systems, high-precision V-groove etching has become crucial. Currently, in the manufacturing of fiber optic V-grooves, etching is one of the key methods for achieving fiber positioning and high reliability.

[0003] Currently, the main components for etching optical fibers consist of a laser and a moving mechanism. The laser generates laser light, and the moving mechanism drives the laser to move, causing the laser to etch the fiber along its length. Before etching, the fiber is held in place by a clamping assembly. However, existing clamping assemblies are limited to clamping and fixing the fiber. When the fiber is long, after etching a section, the clamping mechanism needs to be released, the fiber pulled back, and the un-etched portion clamped again. This process results in intermittent etching, affecting etching efficiency. Furthermore, when fixing the fiber after etching a section, it is difficult to ensure that subsequent etching is aligned with the previous etching, requiring time for adjustment. Summary of the Invention

[0004] (a) Purpose of the invention In view of this, the purpose of this invention is to provide a high-precision fiber V-groove etching device. The technical problem to be solved is that the existing clamping components have a single function, which is limited to clamping and fixing the fiber. When the fiber is long, after a certain section of the fiber is etched, the clamping mechanism needs to be released, and then the fiber needs to be pulled again and the unetched part of the fiber needs to be clamped. This process makes the etching intermittent, which affects the etching efficiency. Moreover, after a certain section is etched, it is difficult to fix it so that the subsequent etching is on the same straight line as the previous etching, which requires time to adjust.

[0005] (II) Technical Solution To achieve the above-mentioned technical objectives, the present invention provides a high-precision fiber optic V-groove etching device: It includes a main unit and a clamping unit. The main unit includes a processing table with a U-shaped cover fixed to the top. The top of the U-shaped cover has a first stroke groove, and a suspension frame is slidably connected in the first stroke groove. A laser is installed at the bottom of the suspension frame. The clamping unit includes two mounting plates. A first hydraulic cylinder is installed on one side of the two mounting plates. A moving plate is fixed to the extended end of the first hydraulic cylinder. Two rectangular plates are provided on one side of the moving plate. A first U-shaped plate is fixed to the end of the rectangular plate away from the moving plate. A second U-shaped plate is provided inside the first U-shaped plate. Two connecting plates are provided inside the second U-shaped plate. A clamping plate is fixed to one side of the connecting plate. A control component for controlling the longitudinal movement of the clamping plate is provided inside the second U-shaped plate. A drive component for driving the horizontal movement of the clamping plate is provided inside the moving plate.

[0006] Preferably, the control component includes two second guide rods fixed inside the second U-shaped plate. The second guide rods pass through the connecting plate, and the connecting plate is slidably fitted to the outside of the second guide rods. A second hydraulic cylinder is installed on the inner wall of the second U-shaped plate. A connecting block is fixed to the extended end of the second hydraulic cylinder. Two rotating rods are rotatably connected to the connecting block. The end of the rotating rod away from the connecting block is hinged to the corresponding connecting plate.

[0007] Preferably, a first spring is sleeved on the outer side of the second guide rod, and the two ends of the first spring abut against the two connecting plates respectively.

[0008] Preferably, two third guide rods are fixed to the inner wall of the first U-shaped plate. The third guide rods pass through the second U-shaped plate, and the second U-shaped plate is slidably fitted to the outside of the third guide rods. A second spring is sleeved on the outside of the third guide rods, and the two ends of the second spring abut against the second U-shaped plate and the first U-shaped plate, respectively.

[0009] Preferably, the movable plate has two rectangular grooves on one side for corresponding rectangular plates to slide in, the movable plate has an inner cavity in the middle, and a bidirectional screw is rotatably connected inside the movable plate. The bidirectional screw passes through the rectangular plate and is threadedly connected to the rectangular plate.

[0010] Preferably, the drive assembly includes a second motor mounted on one side of the movable plate, a rotating shaft rotatably connected inside the movable plate, one end of the rotating shaft being fixed to the output end of the second motor, a second bevel gear being fixed to one end of the rotating shaft extending into the inner cavity, and a first bevel gear being fixed to the middle of the bidirectional screw, the first bevel gear and the second bevel gear meshing with each other.

[0011] Preferably, two limiting rods are fixed on one side of the mounting plate, and a stop block is fixed at the end of the limiting rod away from the mounting plate. Limit blocks are fixed on both sides of the movable plate, the limiting rod passes through the limiting block, and the limiting block is slidably engaged with the corresponding limiting rod.

[0012] Preferably, a second stroke groove is provided on both sides of the U-shaped cover, a sliding block is fixed on one side of the mounting plate, the sliding block is slidably engaged in the second stroke groove, a fourth guide rod is fixed in the second stroke groove, the fourth guide rod passes through the sliding block, and the sliding block is slidably engaged outside the fourth guide rod.

[0013] Preferably, two second ear plates are fixed on both sides of the U-shaped cover, and a second threaded rod is rotatably connected to both second ear plates. The second threaded rod passes through the sliding block and is threadedly connected to the sliding block. A third motor is installed on one of the second ear plates, and one end of the second threaded rod is fixed to the output end of the third motor.

[0014] Preferably, a first guide rod is fixed to the inner wall of the first stroke groove. The first guide rod passes through the suspension frame. The suspension frame is slidably fitted to the outside of the first guide rod. A protrusion is fixed to the top of the suspension frame. Two first ear plates are fixed to the top of the U-shaped cover. A first threaded rod is rotatably connected between the two first ear plates. The first threaded rod passes through the protrusion and is threadedly connected to the protrusion. A first motor is installed on one of the first ear plates. One end of the first threaded rod is fixed to the output end of the first motor.

[0015] As can be seen from the above technical solutions, this application has the following beneficial effects: 1. By alternating the positions of two mounting plates, the clamps on them alternately hold the optical fiber, thus ensuring continuous etching of the optical fiber, improving etching efficiency. Furthermore, the optical fiber remains clamped at all times and does not need to be removed, ensuring that the etching position is always on the same straight line, saving adjustment time.

[0016] 2: By setting a third guide rod, when the clamping plate clamps and fixes the optical fiber, and the clamping plate moves to tighten the optical fiber, the second U-shaped plate will slide on the third guide rod, so that the second U-shaped plate compresses the second spring, thus avoiding excessive movement of the clamping plate and damage to the optical fiber. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a high-precision fiber V-groove etching device provided by the present invention; Figure 2A top-view cross-sectional view of a high-precision fiber optic V-groove etching device provided by the present invention; Figure 3 This is a schematic diagram of the structure of the clamping unit provided by the present invention; Figure 4 Another perspective structural schematic diagram of the clamping unit provided by the present invention; Figure 5 Provided by the present invention Figure 4 Schematic diagram of the structure at point A; Figure 6 Provided by the present invention Figure 3 Schematic diagram of the structure at point B; Figure 7 A top cross-sectional view of the clamping unit provided by the present invention; Figure 8 Another structural schematic diagram of a high-precision fiber V-groove etching device provided by the present invention; Figure 9 Provided by the present invention Figure 8 A schematic diagram of the structure at point C.

[0019] Figure Descriptions: 100, Main Unit; 101, Processing Table; 102, U-shaped Cover; 103, First Stroke Groove; 104, Suspension Frame; 105, Laser; 106, First Guide Rod; 107, Protrusion; 108, First Ear Plate; 109, First Threaded Rod; 110, First Motor; 200, Clamping Unit; 201, Mounting Plate; 202, First Hydraulic Cylinder; 203, Moving Plate; 204, Rectangular Plate; 205, First U-shaped Plate; 206, Second U-shaped Plate; 207, Connecting Plate; 208, Clamping Plate; 209, Second Guide Rod; 210, First... 211. Spring; 212. Second hydraulic cylinder; 213. Connecting block; 214. Rotating rod; 215. Third guide rod; 216. Second spring; 217. Rectangular groove; 218. Inner cavity; 219. Bidirectional screw; 220. First bevel gear; 221. Second motor; 222. Rotating shaft; 223. Second bevel gear; 224. Limiting rod; 225. Stop block; 226. Second stroke groove; 227. Fourth guide rod; 228. Sliding block; 229. Second ear plate; 230. Second threaded rod; 231. Third motor; 300. Optical fiber. Detailed Implementation

[0020] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0021] Reference Figure 1-9 : In one embodiment of the present invention, a high-precision fiber optic V-groove etching apparatus is provided, comprising a main body unit 100 and a clamping unit 200. The main body unit 100 includes a processing table 101, a U-shaped cover 102 fixed to the top of the processing table 101, a first stroke groove 103 formed on the top of the U-shaped cover 102, a suspension frame 104 slidably connected within the first stroke groove 103, and a laser 105 mounted at the bottom of the suspension frame 104. The clamping unit 200 includes two mounting plates 201, and a first hydraulic cylinder 202 is mounted on one side of each mounting plate 201. A movable plate 203 is fixed to the extended end of 202. Two rectangular plates 204 are provided on one side of the movable plate 203. A first U-shaped plate 205 is fixed to the end of the rectangular plate 204 away from the movable plate 203. A second U-shaped plate 206 is provided inside the first U-shaped plate 205. Two connecting plates 207 are provided inside the second U-shaped plate 206. A clamping plate 208 is fixed to one side of the connecting plate 207. A control component for controlling the longitudinal movement of the clamping plate 208 is provided inside the second U-shaped plate 206. A drive component for driving the clamping plate 208 to move horizontally is provided inside the movable plate 203.

[0022] Two limiting rods 223 are fixed to one side of the mounting plate 201. A stop block 224 is fixed to the end of the limiting rod 223 away from the mounting plate 201. Limiting blocks 225 are fixed to both sides of the movable plate 203. The limiting rods 223 pass through the limiting blocks 225, and the limiting blocks 225 are slidably engaged with the corresponding limiting rods 223. A second stroke groove 226 is provided on both sides of the U-shaped cover 102. A sliding block 228 is fixed to one side of the mounting plate 201. The sliding block 228 is slidably engaged in the second stroke groove 226. A fourth guide rod 227 is fixed, which passes through a sliding block 228. The sliding block 228 is slidably fitted to the outside of the fourth guide rod 227. Two second ear plates 229 are fixed on both sides of the U-shaped cover 102. A second threaded rod 230 is rotatably connected to the two second ear plates 229. The second threaded rod 230 passes through the sliding block 228 and is threadedly connected to the sliding block 228. A third motor 231 is installed on one of the second ear plates 229. One end of the second threaded rod 230 is fixed to the output end of the third motor 231.

[0023] Furthermore, a first guide rod 106 is fixed to the inner wall of the first stroke groove 103. The first guide rod 106 passes through the suspension frame 104. The suspension frame 104 is slidably fitted to the outside of the first guide rod 106. A protrusion 107 is fixed to the top of the suspension frame 104. Two first ear plates 108 are fixed to the top of the U-shaped cover 102. A first threaded rod 109 is rotatably connected between the two first ear plates 108. The first threaded rod 109 passes through the protrusion 107 and is threadedly connected to the protrusion 107. A first motor 110 is installed on one of the first ear plates 108. One end of the first threaded rod 109 is fixed to the output end of the first motor 110.

[0024] In addition, the control assembly includes two second guide rods 209 fixed within the second U-shaped plate 206. The second guide rods 209 pass through the connecting plate 207, and the connecting plate 207 is slidably fitted to the outside of the second guide rods 209. A second hydraulic cylinder 211 is installed on the inner wall of the second U-shaped plate 206. A connecting block 212 is fixed to the extended end of the second hydraulic cylinder 211. Two rotating rods 213 are rotatably connected to the connecting block 212. The end of the rotating rod 213 away from the connecting block 212 is hinged to the corresponding connecting plate 207. A first spring 210 is sleeved on the outside of the second guide rod 209. The two ends of the first spring 210 abut against the two connecting plates 207 respectively. Two third guide rods 214 are fixed to the inner wall of the template 205. The third guide rods 214 pass through the second U-shaped plate 206. The second U-shaped plate 206 is slidably fitted to the outside of the third guide rods 214. A second spring 215 is sleeved on the outside of the third guide rods 214. The two ends of the second spring 215 abut against the second U-shaped plate 206 and the first U-shaped plate 205 respectively. Two rectangular grooves 216 are opened on one side of the movable plate 203 for sliding of the corresponding rectangular plate 204. An inner cavity 217 is opened in the middle of the movable plate 203. A bidirectional screw 218 is rotatably connected inside the movable plate 203. The bidirectional screw 218 passes through the rectangular plate 204 and is threadedly connected to the rectangular plate 204.

[0025] When etching is required on the optical fiber 300, the two mounting plates 201 are initially misaligned. Then, the first hydraulic cylinder 202 is activated to move the moving plate 203. When the moving plate 203 moves, it moves the rectangular plate 204, the second U-shaped plate 206, and the clamping plate 208, causing the clamping plate 208 to move closer to the optical fiber 300. When the first U-shaped plate 205 moves to abut against the stop block 224, the clamping plate 208 moves to the outside of the optical fiber 300. Then, the second hydraulic cylinder 211 retracts to move the connecting block 212. When the connecting block 212 moves, it drives the rotating rod 213 to rotate. When the rotating rod 213 rotates, it drives the connecting plate 207 and the clamping plate 208 to move closer to each other, so that the clamping plate 208 clamps the optical fiber 300. Then, the laser 105 and the first motor 110 are activated, causing the laser 105 to etch the optical fiber 300. Activating the first motor 110 causes it to rotate the first threaded rod 109. The rotation of the first threaded rod 109 moves the protrusion 107, the suspension bracket 104, and the laser 105, allowing the laser 105 to move along the optical fiber 300 and etch along its length. After the optical fiber 300 between the two clamping plates 208 on the mounting plate 201 at the foremost position is etched, the second hydraulic cylinder 211 on the mounting plate 201 extends, causing the rotating rod 213 to rotate in the opposite direction, thus moving the clamping plates 208 away from each other. This causes the clamping plates 208 on the mounting plate 201 to no longer hold the optical fiber 300. Then, the first hydraulic cylinder 202 retracts, causing the clamping plates 208 to move away from the outside of the optical fiber 300. Finally, the third motor 231 on one side of the mounting plate 201 is activated, causing the third motor 231 to drive the second threaded rod 107... When the second threaded rod 230 rotates, it drives the mounting plate 201 to move. Then, the third motor 231 on one side of the other mounting plate 201 is activated, causing the second threaded rod 230 to rotate in the opposite direction, thereby driving the other mounting plate 201 to move. At this time, the two mounting plates 201 move in opposite directions, causing the clamping plate 208 on the other mounting plate 201 to move the clamped optical fiber 300 below the laser 105, so that etching can be performed. After the previously moved mounting plate 201 moves, the first hydraulic cylinder 202 extends again, causing the clamping plate 208 on it to clamp the optical fiber 300 again. The two mounting plates 201 are alternately staggered, so that the clamping plate 208 on them alternately clamps the optical fiber 300, thereby making the etching of the optical fiber 300 continuous, improving the etching efficiency. Moreover, the optical fiber 300 is always in a clamped state and does not need to be removed, thus ensuring that the etching position is always on the same straight line, saving adjustment time.

[0026] In addition, the drive assembly includes a second motor 220 mounted on one side of the movable plate 203, a rotating shaft 221 rotatably connected inside the movable plate 203, one end of the rotating shaft 221 being fixed to the output end of the second motor 220, a second bevel gear 222 being fixed to one end of the rotating shaft 221 extending into the inner cavity 217, and a first bevel gear 219 being fixed to the middle of the bidirectional screw 218, the first bevel gear 219 and the second bevel gear 222 meshing with each other.

[0027] After the clamping plate 208 clamps and fixes the optical fiber 300, the second motor 220 is started to drive the rotating shaft 221 to rotate. When the rotating shaft 221 rotates, it drives the second bevel gear 222 to rotate. When the second bevel gear 222 rotates, it drives the first bevel gear 219 to rotate. When the first bevel gear 219 rotates, it drives the bidirectional screw 218 to rotate. When the bidirectional screw 218 rotates, it drives the two rectangular plates 204 to move away from each other. At this time, the rectangular plates 204 drive the second U-shaped plate 206 and the clamping plate 208 to move away from each other, so that the clamping plate 208 tightens the optical fiber 300. Through the design of setting the third guide rod 214, when the clamping plate 208 clamps and fixes the optical fiber 300, when the clamping plate 208 moves to tighten the optical fiber 300, the second U-shaped plate 206 will slide on the third guide rod 214, so that the second U-shaped plate 206 compresses the second spring 215, thus avoiding excessive movement of the clamping plate 208 and damage to the optical fiber 300.

[0028] It should be noted that the two threaded sections of the bidirectional screw 218 have opposite thread directions, and the two rectangular plates 204 are respectively located on different threaded sections of the bidirectional screw 218. In this embodiment, the first motor 110, the first hydraulic cylinder 202, the second hydraulic cylinder 211, the second motor 220, and the third motor 231 are all conventional equipment known to those skilled in the art and available on the market. Models can be selected or customized according to actual needs. In this patent, we only use them without improving their structure and function. Their setting method, installation method, and electrical connection method can be easily explained by those skilled in the art by following the instructions for use. They will not be described in detail here. The first motor 110, the first hydraulic cylinder 202, the second hydraulic cylinder 211, the second motor 220, and the third motor 231 are all equipped with matching control switches. The installation position of the control switches can be selected according to actual usage requirements to facilitate operation and control by the operator.

[0029] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A high-precision fiber optic V-groove etching device, comprising a main body unit (100) and a clamping unit (200), characterized in that, The main unit (100) includes a processing table (101), a U-shaped cover (102) fixed on the top of the processing table (101), a first stroke groove (103) opened on the top of the U-shaped cover (102), a suspension frame (104) slidably connected in the first stroke groove (103), a laser (105) installed at the bottom of the suspension frame (104), and a clamping unit (200) including two mounting plates (201), a first hydraulic cylinder (202) installed on one side of the two mounting plates (201), a moving plate (203) fixed to the extended end of the first hydraulic cylinder (202), and the moving plate (203) Two rectangular plates (204) are provided on one side of the plate (203). A first U-shaped plate (205) is fixed to one end of the rectangular plate (204) away from the moving plate (203). A second U-shaped plate (206) is provided inside the first U-shaped plate (205). Two connecting plates (207) are provided inside the second U-shaped plate (206). A clamping plate (208) is fixed to one side of the connecting plate (207). A control component for controlling the longitudinal movement of the clamping plate (208) is provided inside the second U-shaped plate (206). A driving component for driving the horizontal movement of the clamping plate (208) is provided inside the moving plate (203).

2. The high-precision fiber optic V-groove etching apparatus according to claim 1, characterized in that, The control component includes two second guide rods (209) fixed inside the second U-shaped plate (206). The second guide rods (209) pass through the connecting plate (207). The connecting plate (207) is slidably fitted to the outside of the second guide rods (209). A second hydraulic cylinder (211) is installed on the inner wall of the second U-shaped plate (206). A connecting block (212) is fixed to the extended end of the second hydraulic cylinder (211). Two rotating rods (213) are rotatably connected to the connecting block (212). The end of the rotating rod (213) away from the connecting block (212) is hinged to the corresponding connecting plate (207).

3. The high-precision fiber V-groove etching device according to claim 2, characterized in that, The second guide rod (209) is fitted with a first spring (210) on its outer side, and the two ends of the first spring (210) abut against the two connecting plates (207) respectively.

4. The high-precision fiber V-groove etching apparatus according to claim 1, characterized in that, Two third guide rods (214) are fixed on the inner wall of the first U-shaped plate (205). The third guide rods (214) pass through the second U-shaped plate (206). The second U-shaped plate (206) is slidably fitted on the outside of the third guide rods (214). A second spring (215) is sleeved on the outside of the third guide rods (214). The two ends of the second spring (215) abut against the second U-shaped plate (206) and the first U-shaped plate (205) respectively.

5. The high-precision fiber optic V-groove etching apparatus according to claim 1, characterized in that, The movable plate (203) has two rectangular grooves (216) on one side for sliding of corresponding rectangular plates (204). The movable plate (203) has an inner cavity (217) in the middle. A bidirectional screw (218) is rotatably connected inside the movable plate (203). The bidirectional screw (218) passes through the rectangular plate (204) and is threadedly connected to the rectangular plate (204).

6. The high-precision fiber optic V-groove etching apparatus according to claim 5, characterized in that, The drive assembly includes a second motor (220) mounted on one side of the movable plate (203). A rotating shaft (221) is rotatably connected inside the movable plate (203). One end of the rotating shaft (221) is fixed to the output end of the second motor (220). A second bevel gear (222) is fixed to one end of the rotating shaft (221) extending into the inner cavity (217). A first bevel gear (219) is fixed to the middle of the bidirectional screw (218). The first bevel gear (219) meshes with the second bevel gear (222).

7. The high-precision fiber optic V-groove etching apparatus according to claim 1, characterized in that, Two limiting rods (223) are fixed on one side of the mounting plate (201). A stop block (224) is fixed at the end of the limiting rod (223) away from the mounting plate (201). Limiting blocks (225) are fixed on both sides of the moving plate (203). The limiting rod (223) passes through the limiting block (225). The limiting block (225) slides outside the corresponding limiting rod (223).

8. The high-precision fiber optic V-groove etching apparatus according to claim 1, characterized in that, The U-shaped cover (102) has a second stroke groove (226) on both sides. A sliding block (228) is fixed on one side of the mounting plate (201). The sliding block (228) is slidably engaged in the second stroke groove (226). A fourth guide rod (227) is fixed in the second stroke groove (226). The fourth guide rod (227) passes through the sliding block (228). The sliding block (228) is slidably engaged in the fourth guide rod (227).

9. The high-precision fiber optic V-groove etching apparatus according to claim 8, characterized in that, Two second ear plates (229) are fixed on both sides of the U-shaped cover (102). A second threaded rod (230) is rotatably connected inside the two second ear plates (229). The second threaded rod (230) passes through the sliding block (228) and is threadedly connected to the sliding block (228). A third motor (231) is installed on one of the second ear plates (229). One end of the second threaded rod (230) is fixed to the output end of the third motor (231).

10. The high-precision fiber V-groove etching apparatus according to claim 1, characterized in that, A first guide rod (106) is fixed on the inner wall of the first stroke groove (103). The first guide rod (106) passes through the suspension frame (104). The suspension frame (104) is slidably fitted to the outside of the first guide rod (106). A protrusion (107) is fixed on the top of the suspension frame (104). Two first ear plates (108) are fixed on the top of the U-shaped cover (102). A first threaded rod (109) is rotatably connected between the two first ear plates (108). The first threaded rod (109) passes through the protrusion (107) and is threadedly connected to the protrusion (107). A first motor (110) is installed on one of the first ear plates (108). One end of the first threaded rod (109) is fixed to the output end of the first motor (110).

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