Tension adjusting device of textile equipment

Abstract

The invention discloses a textile equipment tension adjusting device, and relates to the technical field of textile, the textile equipment tension adjusting device comprises a base, the two sides of the base are slidably connected with sliding plates, the sliding plates are provided with a support, the support is rotatably connected with a driving roller, the upper surface of the support is provided with an adjusting frame, the adjusting frame is slidably connected with a pressing roller, and the center of the upper surface of the base is provided with a regulation and control frame; a tension roller is assembled on the regulation and control frame, supporting columns are installed on the two sides of the upper surface of the base, sliding rods are connected into the supporting columns in a sliding mode, a lower roller frame is installed on the upper surfaces of the sliding rods, an upper roller frame is arranged over the lower roller frame, and a plurality of clamping rollers are connected into the upper roller frame and the lower roller frame through rotating shafts. The tension roller can vertically move on the adjusting and controlling frame, the tension of the textile is accurately adjusted, the textile machine adapts to textile processes with different tension requirements, furthermore, the height of the pressing roller on the adjusting frame is adjusted through a screw rod, fine adjustment can be conducted according to different fabric thicknesses and tension requirements, and the textile machine tension adjusting and controlling device is suitable for textile processes with different tension requirements. And the accuracy of tension adjustment is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of textiles, and specifically relates to a tension adjusting device for textile equipment. Background Art

[0002] During the textile process, the tension control of yarns or fabrics is crucial. The traditional tension adjusting devices of textile equipment have low adjusting precision and cannot meet the requirements of modern textile industry for the production of high-quality textiles. Some devices have poor adaptability when facing yarns of different materials and thicknesses.

[0003] A tension adjusting device for textile equipment disclosed in Chinese Utility Model Patent CN219906372U uses the mutual cooperation of a tension adjusting component, a chassis, a second motor, a tension control frame, a threaded rod, a limit block, a limit hole, an adjusting sleeve, a support frame and a tension adjusting roller, achieving the effect of making the device convenient for tension adjustment of textile materials. By using the second motor to drive the threaded rod to rotate, the adjusting sleeve continuously rises and falls with the rotation of the threaded rod, and secondly, by the rising and falling of the adjusting sleeve, the tension adjusting roller can be adjusted to conduct tension adjustment test on textile materials, which can meet people's usage requirements.

[0004] Most of the existing tension adjusting devices use a lifting roller to lift the textile upwards to achieve the purpose of tensioning the textile. However, this adjustment method can only control the tension of the warp of the textile, and the tension in the weft direction of the textile is not adjusted. Therefore, when the textile is extended through tension adjustment, the effect is poor. Summary of the Invention

[0005] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract and the title. However, such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] To solve the problems raised in the above background art, the present invention adopts the following technical solutions.

[0007] A tension adjusting device for textile equipment includes a base. Sliding plates are slidably connected to both sides of the base. A bracket is arranged on the sliding plates. A driving roller is rotatably connected to the bracket. An adjusting frame is arranged on the upper surface of the bracket. A pressure roller is slidably connected to the adjusting frame. A control frame is arranged at the center of the upper surface of the base. A tension roller is assembled on the control frame and can move vertically on the control frame. Pillars are installed on both sides of the upper surface of the base. A sliding rod is slidably connected inside the pillar. A lower roller frame is installed on the upper surface of the sliding rod. An upper roller frame is arranged directly above the lower roller frame. A plurality of pinch rollers are connected by a rotating shaft inside the upper roller frame and the lower roller frame.

[0008] The strut is internally provided with a cylinder, and the output end of the cylinder is connected to the bottom of the sliding rod. A double-axis cylinder is installed on the side of the upper roller frame, and the output end of the double-axis cylinder is connected to the upper surface of the sliding rod.

[0009] The regulation frame is of a hollow structure, and rail bars are arranged on the inner wall of the cavity of the regulation frame. A rack is slidably connected to the rail bars. A bracket is provided on the upper surface of the rack, and a roller seat is mounted on the bracket. The tension roller is rotatably connected to the roller seat. A U-shaped groove is formed in the regulation frame for the roller seat to move vertically on the regulation frame.

[0010] The side of the rack is meshed with a gear. A hole for the gear to pass through is formed in the front surface of the regulation frame, and a protective cover is covered outside the hole. Part of the gear is located inside the protective cover. A driver is also installed on the regulation frame. A drive shaft is provided at the driving end of the driver, and the drive shaft passes through the protective cover and is fixedly connected to the center of the gear.

[0011] A connecting frame is fixedly connected to the regulation frame by bolts. The connecting frame is of a concave structure, and middle bearings are connected to both ends of the connecting frame. Both ends of the drive shaft are connected to the bearings, and the driver is fixed to the connecting frame by a machine frame.

[0012] The adjusting frame is of a frame structure. A sliding groove is formed in the inner wall of the adjusting frame. A sliding block is arranged inside the adjusting frame, and the sliding block is slidably connected in the sliding groove. The pressure roller is connected to the sliding block by a bearing.

[0013] A screw sleeve is arranged on the upper surface of the adjusting frame. A screw rod is threadedly connected to the screw sleeve, and the end of the screw rod passes through the upper surface of the adjusting frame and is connected to the sliding block. The connection between the screw rod and the sliding block is connected by a bearing.

[0014] Limit grooves are formed on both sides of the base. When the sliding plate is slidably connected inside the base, limit blocks are installed on both sides of the sliding plate, and the limit blocks are slidably arranged in the limit grooves.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, the tension roller can move vertically on the regulation frame, and its movement control is realized through complex and precise transmission structures such as the driver, gear, and rack. This precise movement control helps to accurately adjust the position of the tension roller, thereby precisely adjusting the tension of the textile and adapting to textile processes with different tension requirements. Further, the height of the pressure roller on the adjusting frame is adjusted by the screw rod, and it can be finely adjusted according to different fabric thicknesses and tension requirements, further improving the accuracy of tension adjustment.

[0016] In the present invention, there is not only the vertical movement adjustment of the tension roller, but also the height adjustment of the pressure roller, and the slight clamping action of the pinch roller is also combined. This combination of multiple methods can comprehensively adjust the tension of the textile from multiple angles, which is more accurate and comprehensive than a single tension adjustment method. Further, when the tension roller moves upward to lift the textile, there is a certain pulling force on the weft direction on both sides of the textile through the slight clamping of the pinch roller. This design helps to perform special tension control on the weft during the textile process, and plays a certain progressive role in the production of fabrics with special requirements for weft tension, such as fabrics with special textures or patterns. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional view of the tension adjustment device in the present invention Figure 1 .

[0018] Figure 2 is a three-dimensional view of the tension adjustment device in the present invention Figure 2 .

[0019] Figure 3 is a front view of the tension adjustment device in the present invention Figure 1 .

[0020] Figure 4 is a front view of the tension adjustment device in the present invention Figure 2 .

[0021] Figure 5 is the structure of the tension adjustment mechanism at the edge of the textile in the present invention Figure 1 .

[0022] Figure 6 is the structure of the tension adjustment mechanism at the edge of the textile in the present invention Figure 2 .

[0023] Figure 7 is a structural diagram of the tension adjustment mechanism in the middle of the textile in the present invention.

[0024] Figure 8 is an internal structural diagram of the tension adjustment mechanism in the middle of the textile in the present invention.

[0025] The corresponding relationship between the labels of each component in the figure and the component names is as follows: 1. Base; 11. Limit groove; 12. Slide plate; 121. Limit block; 13. Bracket; 14. Driving roller; 15. Adjusting frame; 151. Sliding block; 152. Screw rod; 153. Pressing roller; 16. Support pillar; 161. Slide rod; 162. Cylinder; 163. Lower roller frame; 164. Upper roller frame; 166. Clamping roller; 17. Regulation frame; 171. Rail; 172. Rack; 173. Bracket; 174. Roller seat; 175. Tension roller; 176. Driver; 1761. Driving shaft; 177. Gear; 178. Protective cover; 179. Connecting frame. Detailed implementation manners

[0026] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings of the specification.

[0027] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments. The present invention provides the following embodiments.

[0029] Refer to Figures 1 - 3This is the structural diagram of the tension adjustment device for textile equipment in this embodiment. The tension adjustment device in this embodiment includes a base 1. The base 1 serves as the basic support structure for the entire tension adjustment device of the textile equipment, providing a reference surface for the installation and positioning of other components to ensure the stability of the entire device. Slidingly connected to both sides of the base 1 are sliding plates 12. Provided on the sliding plates 12 are brackets 13. Rotatably connected to the brackets 13 is a driving roller 14. During the textile process, the driving roller 14 provides power for the transmission of the fabric through rotation, prompting the fabric to move in the device in a predetermined direction. Therefore, in this embodiment, a motor should be assembled at one end of the driving roller 14 as a driving component to drive the driving roller 14 to rotate. Provided on the upper surface of the bracket 13 is an adjustment frame 15. Slidingly connected to the adjustment frame 15 is a pressure roller 153. In this embodiment, the adjustment frame 15 provides a sliding frame structure for the pressure roller 153, enabling the pressure roller 153 to slide and adjust within the adjustment frame 15. By changing the position of the pressure roller 153, the adjustment frame 15 can apply different degrees of pressure to the fabric, thereby adjusting the tension of the fabric. Specifically, when the pressure roller 153 presses down, it will increase the tension of the fabric in this area. The pressure roller 153 can adjust the distance from the driving roller 14 or other rollers by sliding within the adjustment frame 15. When the pressure roller 153 approaches the driving roller 14, it will squeeze the passing fabric, thereby changing the magnitude of the fabric tension.

[0030] Figure 7 and Figure 8 In the base 1, at the center of the upper surface, there is a control frame 17. Assembled on the control frame 17 is a tension roller 175. The control frame 17 provides an assembly position for the tension roller 175 and enables the tension roller 175 to move vertically on the control frame 17 through its structural design. This vertical movement ability is one of the key factors for adjusting the fabric tension. The tension roller 175 is one of the core components for adjusting the fabric tension. By vertically moving on the control frame 17, it can change the wrap angle and force-bearing condition of the fabric at the tension roller 175, thereby directly adjusting the fabric tension. According to the different tension requirements of the fabric, the tension roller 175 can be adjusted to an appropriate height position to meet the fabric tension requirements of different textile processes.

[0031] Figure 7 and Figure 8In it, the regulation frame 17 is of a hollow structure, and rail strips 171 are arranged on the inner wall of the cavity of the regulation frame 17. A rack 172 is slidably connected to the rail strips 171. The rail strips 171 provide a sliding track for the rack 172, restricting the movement direction of the rack 172 so that it can only perform linear sliding along the rail strips 171. A gear 177 meshes with the side of the rack 172. On the one hand, the rack 172 serves as a transmission component for the vertical movement of the tension roller 175. On the other hand, it meshes with the gear 177, converting the rotational movement of the gear 177 into its own linear movement to achieve the vertical movement of the tension roller 175. A bracket 173 is provided on the upper surface of the rack 172, and a roller seat 174 is mounted on the bracket 173. The tension roller 175 is rotatably connected to the roller seat 174. A U-shaped groove is formed on the regulation frame 17 for the roller seat 174 to move vertically on the regulation frame 17. In this embodiment, the bracket 173 supports the roller seat 174, providing a stable placement platform for the roller seat 174 to ensure the stable installation of the tension roller 175. The roller seat 174 provides a basis for the rotational connection of the tension roller 175, enabling the tension roller 175 to rotate freely thereon. The tension roller 175 plays a role in adjusting the tension in the entire device. For example, during the process of conveying materials or paper, etc., it adjusts the tension size through its own rotation and vertical movement. The gear 177 meshes with the rack 172, transmitting the power of the driver 176 to the rack 172, thereby driving the rack 172 and the components thereon to perform vertical movement..

[0032] Figure 7 and Figure 8 In it, a hole for the gear 177 to pass through is formed on the front surface of the regulation frame 17, and a protective cover 178 is covered outside the hole for protecting the gear 177, preventing interference from the outside such as dust and foreign objects to the normal operation of the gear 177, and at the same time playing a certain safety protection role for the operator. Part of the gear 177 is located inside the protective cover 178. A driver 176 is also installed on the regulation frame 17. A drive shaft 1761 is provided at the drive end of the driver 176. The drive shaft 1761 passes through the protective cover 178 and is fixedly connected to the center of the gear 177. The driver 176 provides power for the entire movement, and the drive shaft 1761 transmits the power of the driver 176 to the gear 177 to make the gear 177 rotate.

[0033] Figure 1 and Figure 2 In it, a connecting frame 179 is fixedly connected to the regulation frame 17 by bolts. The connecting frame 179 is of a concave structure, and middle bearings are connected to both ends of the connecting frame 179. Both ends of the drive shaft 1761 are connected to the bearings. The driver 176 is fixed to the connecting frame 179 by a frame. In this embodiment, it connects the driver 176 and the regulation frame 17, providing a stable installation position for the driver 176. At the same time, its concave structure and the bearings at both ends provide support and a rotational connection point for the drive shaft 1761.

[0034] In this embodiment, the driver 176 drives the gear 177 to rotate. The gear 177 drives the rack 172 to move vertically along the rail 171. The bracket 173, the roller seat 174 and the tension roller 175 on the rack 172 move vertically accordingly. This vertical movement can adjust the height position of the tension roller 175 according to requirements, thereby precisely adjusting the tension magnitude, which is applicable to different working requirements. The connecting frame 179 stably supports the drive shaft 1761 through bearings, ensuring that the power of the driver 176 is stably transmitted to the gear 177, and further ensuring the stability of the movement of components such as the rack 172 and the tension roller 175. The protective cover 178 not only ensures the normal operation of the gear 177 but also avoids the problem of unstable power transmission caused by external interference.

[0035] Figure 5 and Figure 6 In [specific context], on both sides of the upper surface of the base 1, there are installed columns 16. A slide bar 161 is slidably connected inside the column 16 to ensure that the slide bar 161 can stably slide up and down inside the column 16. A cylinder 162 is built inside the column 16, and the output end of the cylinder 162 is connected to the bottom of the slide bar 161. The slide bar 161 is connected to the lower roller frame 163 and the column 16, transmitting the power of the cylinder 162 to the lower roller frame 163, so that the lower roller frame 163 can move up and down driven by the slide bar 161. The upper surface of the slide bar 161 is equipped with a lower roller frame 163. A upper roller frame 164 is arranged directly above the lower roller frame 163. A double-acting cylinder 165 is installed on the side of the upper roller frame 164, and the output end of the double-acting cylinder 165 is connected to the upper surface of the slide bar 161. A plurality of pinch rollers 166 are connected inside the upper roller frame 164 and the lower roller frame 163 by rotating shafts. In this embodiment, in the entire fabric tension adjustment system, the cylinder 162 indirectly affects the clamping force of the pinch rollers 166 on the fabric by controlling the position of the lower roller frame 163, thereby adjusting the fabric tension. The double-acting cylinder 165 provides power for the upper roller frame 164, enabling it to move up and down relative to the slide bar 161. This power output method can precisely control the displacement of the upper roller frame 164, and then adjust the clamping force of the pinch rollers 166 on the fabric. Moreover, the upper roller frame 164 and the lower roller frame 163 together form the installation frame of the pinch rollers 166, ensuring the stability and accuracy of the pinch rollers 166 during operation, and ensuring that the fabric can pass smoothly between the pinch rollers 166 and the tension is adjusted.

[0036] In this embodiment, through the coordinated action of various methods such as the vertical movement of the tension roller 175, the sliding adjustment of the pressure roller 153, and the clamping force adjustment of the pinch roller 166, the adjustment of the fabric tension in multiple dimensions is achieved. This multi-dimensional adjustment method can more precisely meet the complex requirements of different textile processes and fabric types for tension. The driving roller 14 provides the power for fabric transmission. The tension roller 175, the pressure roller 153, and the pinch roller 166 also play an auxiliary role in fabric transmission while adjusting the tension. The coordinated cooperation between these rollers enables the fabric to be smoothly transmitted within the device, reducing problems such as shaking and deviation of the fabric during transmission.

[0037] The adjusting frame 15 has a frame-shaped structure. A sliding groove is provided on the inner wall of the adjusting frame 15. A sliding block 151 is disposed inside the adjusting frame 15, and the sliding block 151 is slidably connected in the sliding groove. The sliding groove on the inner wall provides a sliding track for the sliding block 151, enabling the sliding block 151 to move inside the adjusting frame 15 in a specific direction. The sliding block 151 is an intermediate component connecting the pressure roller 153 and the screw 152. The sliding of the sliding block 151 in the sliding groove of the adjusting frame 15 can change the position of the pressure roller 153. Since the pressure roller 153 is connected to the sliding block 151 through a bearing, the movement of the sliding block 151 can drive the pressure roller 153 to move, thereby realizing the adjustment of the position of the pressure roller 153.

[0038] A screw sleeve is provided on the upper surface of the adjusting frame 15. The screw 152 is threadedly connected to the screw sleeve. The end of the screw 152 penetrates the upper surface of the adjusting frame 15 and is connected to the sliding block 151. The connection between the screw 152 and the sliding block 151 is joined through a bearing. In this embodiment, the screw 152 is threadedly connected to the screw sleeve on the upper surface of the adjusting frame 15. By rotating the screw 152, the up and down movement of the screw 152 in the screw sleeve can be achieved. Since the end of the screw 152 is connected to the sliding block 151 through a bearing, the rotational movement of the screw 152 can be converted into the linear movement of the sliding block 151, thereby precisely adjusting the height position of the sliding block 151 and the pressure roller 153.

[0039] Refer to Figure 3 and Figure 4 In [references], limit grooves 11 are provided on both sides of the base 1. When the sliding plate 12 is slidably connected inside the base 1, limit blocks 121 are installed on both sides of the sliding plate 12, and the limit blocks 121 are slidably disposed in the limit grooves 11. The base 1 in this embodiment is the basic part of the entire device, providing support for other components. The limit grooves 11 are provided on both sides of the base 1, and their function is to provide a sliding track for the limit blocks 121 on both sides of the sliding plate 12, restricting the sliding direction of the sliding plate 12 inside the base 1 to ensure that the sliding plate 12 can only slide in a predetermined direction.

[0040] In summary: The fabric first enters the device and starts to be transported inside the device under the rotation drive of the drive roller 14. The drive roller 14 provides the initial power for the fabric, causing the fabric to move in a predetermined direction. According to the tension requirement of the fabric, the driver (not detailed in the figure) on the regulation frame 17 is activated, and drives the rack to move through transmission components such as the drive shaft and gears, so that the tension roller 175 makes a vertical movement on the regulation frame 17. When the tension roller 175 rises, the wrap angle of the fabric at the tension roller 175 increases and the tension increases; conversely, the tension decreases. By adjusting the screw on the adjustment frame 15, the sliding position of the pressure roller 153 inside the adjustment frame 15 is changed. When the pressure roller 153 presses down, the fabric is squeezed between the pressure roller 153 and the drive roller 14, and the tension increases; when the pressure roller 153 rises, the tension decreases. The air cylinder 162 expands and contracts to drive the slide rod 161 to move up and down, thereby changing the height position of the lower roller frame 163; at the same time, the double-axis air cylinder 165 drives the upper roller frame 164 to move up and down. The relative movement of the upper roller frame 164 and the lower roller frame 163 adjusts the clamping force of the pinch roller 166 on the fabric. When the clamping force increases, the tension of the fabric at the pinch roller 166 increases; when the clamping force decreases, the tension decreases. During the fabric transportation process, the tension adjustment components such as the tension roller 175, the pressure roller 153, and the pinch roller 166 continuously adjust according to the fabric tension feedback (which can be through devices such as sensors, not mentioned in the figure). These components influence and cooperate with each other to jointly maintain the tension stability of the fabric during the transportation process in the whole device to meet the requirements of the textile process.

[0041] The above content further elaborates on the present invention in combination with specific embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as falling within the protection scope determined by the claims submitted for the present invention.

Claims

1. A textile equipment tension adjusting device, comprising a base (1). On both sides of the base (1), there are slidingly connected skateboards (12). On the skateboards (12), there are provided brackets (13). On the brackets (13), there is a rotatably connected driving roller (14). On the upper surface of the brackets (13), there is an adjusting frame (15). On the adjusting frame (15), there is a slidingly connected pressure roller (153). It is characterized in that: At the center of the upper surface of the base (1), there is provided a control frame (17). On the control frame (17), there is assembled a tension roller (175). The tension roller (175) can move vertically on the control frame (17). On both sides of the upper surface of the base (1), there are installed columns (16). Inside the columns (16), there is a slidingly connected slide bar (161). On the upper surface of the slide bar (161), there is an installed lower roller frame (163). Directly above the lower roller frame (163), there is an upper roller frame (164). Inside the upper roller frame (164) and the lower roller frame (163), there are connected multiple pinch rollers (166) by a rotating shaft.

2. The textile equipment tension adjustment device according to claim 1, wherein: Inside the column (16), there is a cylinder (162), and the output end of the cylinder (162) is connected to the bottom of the slide bar (161). On the side of the upper roller frame (164), there is a double-acting cylinder (165) installed, and the output end of the double-acting cylinder (165) is connected to the upper surface of the slide bar (161).

3. The textile equipment tension adjusting device according to claim 2, characterized in that: The control frame (17) is of a hollow structure, and on the inner wall of the cavity of the control frame (17), there are provided rail bars (171). On the rail bars (171), there is a slidingly connected rack (172). On the upper surface of the rack (172), there is a bracket (173). On the bracket (173), there is a mounted roller seat (174). The tension roller (175) is rotatably connected to the roller seat (174). On the control frame (17), there is a U-shaped groove opened for the roller seat (174) to move vertically on the control frame (17).

4. The textile equipment tension adjustment device according to claim 3, characterized in that: On the side of the rack (172), there is a meshing gear (177). On the front surface of the control frame (17), there is a hole for the gear (177) to pass through, and outside the hole, there is a protective cover (178) covered. Part of the gear (177) is located inside the protective cover (178). On the control frame (17), there is also an installed driver (176). At the driving end of the driver (176), there is a driving shaft (1761). The driving shaft (1761) penetrates through the protective cover (178) and is fixedly connected to the center of the gear (177).

5. The textile equipment tension adjusting device according to claim 4, characterized in that: On the control frame (17), there is a connecting frame (179) fixedly connected by bolts. The connecting frame (179) is of a concave structure, and both ends of the connecting frame (179) are connected with middle bearings. Both ends of the driving shaft (1761) are connected to the bearings. The driver (176) is fixed on the connecting frame (179) by a frame.

6. The textile equipment tension adjusting device according to claim 1, characterized in that: The adjusting frame (15) is of a frame structure. Inside the adjusting frame (15), there are sliding grooves opened. Inside the adjusting frame (15), there is a sliding block (151), and the sliding block (151) is slidingly connected in the sliding grooves. The pressure roller (153) is connected to the sliding block (151) by a bearing.

7. The textile equipment tension adjusting device according to claim 6, characterized in that: A screw sleeve is provided on the upper surface of the adjusting frame (15), a screw rod (152) is threadedly connected in the screw sleeve, and the end of the screw rod (152) penetrates through the upper surface of the adjusting frame (15) and is connected to the sliding block (151), and the connection between the screw rod (152) and the sliding block (151) is joined by a bearing.

8. The textile equipment tension adjusting device according to claim 1, characterized in that: Limiting grooves (11) are provided on both sides of the base (1). When the sliding plate (12) is slidably connected in the base (1), limiting blocks (121) are installed on both sides of the sliding plate (12), and the limiting blocks (121) are slidably arranged in the limiting grooves (11).

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