A raw cloth spreading device for briefs processing
By using a support plate structure with a limiting plate, magnetic adsorption, and hydraulic cylinder drive, the problem of directional deviation caused by external force interference during the loosening process of raw fabric is solved, achieving stable sliding of raw fabric and improving the loosening effect, thereby improving the quality and efficiency of underwear processing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FUJIAN MIYU TECH CO LTD
- Filing Date
- 2025-06-12
- Publication Date
- 2026-06-12
AI Technical Summary
The existing fabric loosening device for underwear processing is easily affected by external forces during the movement of the fabric, resulting in directional deviation, affecting the loosening effect and reducing the practicality of the device.
A raw material cloth loosening device including a limiting mechanism and an installation mechanism was designed. The support plate structure, which is attracted by a magnet and driven by a hydraulic cylinder, ensures that the raw material cloth slides and is placed stably on the loosening machine, avoiding external interference.
It effectively prevents angular deviation of raw fabric during the loosening process, improves the stability of the loosening process and the effectiveness of the device, reduces the burden of manual operation, and improves the quality and efficiency of underwear processing.
Smart Images

Figure CN224350002U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of raw material fabric loosening technology, specifically a raw material fabric loosening device for underwear processing. Background Technology
[0002] Fabric loosening is a pretreatment process in textile processing. It involves workers unrolling and allowing the rolled fabric to rest to release internal stress, and then using mechanical processing to improve the physical state of the fabric. Because internal tension is generated during weaving and winding, loosening allows the fabric to shrink naturally, reducing the risk of deformation during subsequent cutting or sewing. This loosening process can be combined with pre-shrinking treatment to release shrinkage stress in advance, ensuring dimensional stability of the finished product. Loosening also restores the soft, fluffy feel of the fabric, preventing stiffness and hardening caused by long-term rolling and pressing. Underwear processing refers to the manufacturing process of turning raw materials into finished underwear through cutting, sewing, and shaping. It requires first loosening the raw fabric used for underwear processing, unrolling the rolled fabric, allowing it to rest to release internal stress, and reducing the risk of subsequent deformation. Then, an automatic cutting machine is used to cut the fabric according to the pattern. Underwear processing is a refined production process that integrates traditional sewing with new material technologies. Its process selection directly affects product comfort and cost, and it is currently upgrading towards intelligence and functionality.
[0003] In current underwear processing, the raw material fabric is typically loosened by workers using a loosening machine. This loosening machine is a specialized piece of equipment used in textile and garment production for pre-treating rolled fabrics. It primarily eliminates internal stress generated during weaving, dyeing, and winding, restoring the fabric to its natural state and ensuring subsequent processing accuracy. Through mechanical unfolding and resting, it eliminates tension caused by rolling and pressing, reducing deformation after cutting. It replaces manual unfolding, reducing labor intensity. Loosening the fabric releases basic stress, avoiding cutting errors caused by uneven fabric tension. It focuses on the pre-treatment stage of finished fabric rolls. The raw material fabric loosening device for underwear processing is a device used to loosen the raw material fabric during underwear processing.
[0004] Based on the above, the inventors have discovered that: Currently, there are many raw material loosening devices for underwear processing on the market. However, in general, raw material loosening devices for underwear processing involve workers using a loosening machine to loosen the raw material. When the raw material moves on the rollers of the loosening machine, it is easily affected by external forces, causing deviations in the direction of movement of the raw material, thus affecting the normal loosening of the raw material by the loosening machine and reducing the practicality of the device. Therefore, in view of this, the inventors have researched and improved the existing structure to provide a raw material loosening device for underwear processing, aiming to achieve a more practical value. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:
[0006] This utility model discloses a raw material fabric loosening device for underwear processing, including a loosening machine body, a base fixed to the bottom end of the loosening machine body, a limiting mechanism on the outer wall of the loosening machine body, and an installation mechanism on the top end of the base.
[0007] The limiting mechanism includes:
[0008] The iron column is fixed to the outer wall of the main body of the fabric loosening machine on both sides. Two limiting plates are provided at the top of the iron column. Both limiting plates slide against the outer wall of the main body of the fabric loosening machine. A ring plate is fixed at the bottom of the two limiting plates. The inner wall of the two ring plates slides against the outer wall of the iron column. A cover plate is fixed on one side of the two limiting plates. Both cover plates are located above the main body of the fabric loosening machine.
[0009] As a preferred embodiment of this utility model, the outer walls of the two limiting plates are fixed with perforated plates, the inner walls of the two perforated plates are fitted with connecting columns, the bottom ends of the two connecting columns are fixed with magnets, and the outer walls of the two magnets are magnetically attracted to the top ends of the iron columns.
[0010] As a preferred embodiment of this utility model, a connecting block is fixed on one side of each of the two baffles, and two grooves are formed on the outer wall of each of the two limiting plates, with the inner wall of each groove matching the outer wall of the connecting block.
[0011] As a preferred embodiment of this utility model, the inner walls of both connecting columns are threaded with studs, and one end of each stud is threaded with the inner wall of the limiting plate.
[0012] As a preferred embodiment of this utility model, the installation mechanism includes:
[0013] The bottom block is fixed to the top of the base. A support plate slides on the top of the bottom block. A hydraulic cylinder is fixed to one side of the bottom block. A push block is fixed to the output end of the hydraulic cylinder. The outer wall of the push block slides against the inner wall of the bottom block. One side of the push block is fixed to one side of the support plate.
[0014] As a preferred embodiment of this utility model, the inner wall of the base block has two sliding plates, and the top ends of the two sliding plates are fixed to the bottom end of the support plate.
[0015] As a preferred embodiment of this utility model, clamping blocks are provided on both sides of the support plate, and an insert plate is fixed on one side of each of the two clamping blocks. The outer walls of the two insert plates are fitted into the inner wall of the main body of the cloth loosening machine.
[0016] As a preferred embodiment of this utility model, the outer walls of both clamping blocks are fixed with a number of limiting posts, and the two sides of the support plate are provided with a number of limiting grooves, the inner walls of the limiting grooves being matched with the outer walls of the limiting posts.
[0017] The beneficial effects of this utility model are:
[0018] 1. This solution uses two limiting plates that slide on the outer wall of the fabric loosening machine until one side of the limiting plate contacts the outer wall of the raw material fabric moving on it. A cover plate is installed on one side of the limiting plate, and the outer wall of the connecting block fixed on one side of the cover plate engages with the inner wall of the groove to protect the contact point between the limiting plate and the raw material fabric, preventing the fabric edge from rolling up and affecting the normal operation of the device. The outer wall of the connecting column is fitted with the inner wall of the perforated plate, and the magnet fixed at the bottom of the connecting column is magnetically attracted to the top of the iron column. This ensures that the limiting plate is firmly installed on the outer wall of the fabric loosening machine, thereby ensuring that the raw material fabric slides stably on the fabric loosening machine until it is driven to loosen at the top of the support plate. This avoids the raw material fabric being affected by external forces during its movement on the fabric loosening machine, which could cause deviations in the angle of movement of the raw material fabric. Therefore, this facilitates better loosening of the raw material fabric for underwear processing and effectively improves the performance of the device.
[0019] 2. In this scheme, the output end of the hydraulic cylinder drives the push block to slide on the inner wall of the base block, thereby driving the support plate to slide on the base block. At the same time, two sliding plates fixed at the bottom of the support plate slide on the inner wall of the base block until one side of the support plate is moved to abut against the outer wall of the base block. Two insert plates are then fitted onto the inner wall of the fabric loosening machine body, causing the clamping block fixed on one side of the insert plate to slide on the outer wall of the base block. The outer wall of the clamping block engages with one side of the support plate until the limiting post fixed on the outer wall of the clamping block matches the inner wall of the limiting groove. This ensures that the support plate is stably installed on the outer wall of the base block, allowing the operator to control the fabric loosening machine body to stably place the raw materials for underwear processing on the top of the support plate, avoiding external interference that could cause the support plate to move on the base block. It also facilitates the operator's quick handling of the raw materials after loosening the fabric, making the device easy to use. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of a raw material fabric loosening device for underwear processing according to this utility model;
[0021] Figure 2 This is a side view of a raw material fabric loosening device for underwear processing according to the present invention.
[0022] Figure 3 This is an exploded view of the limiting mechanism of a raw material fabric loosening device for underwear processing according to this utility model.
[0023] Figure 4This is an exploded view of the installation mechanism of a raw material fabric loosening device for underwear processing according to this utility model.
[0024] Figure 5 This is an exploded view of the structure of the clamping block and support plate of the raw material fabric loosening device for underwear processing according to this utility model.
[0025] In the diagram: 1. Main body of the cloth loosening machine; 2. Base; 3. Limiting mechanism; 31. Iron column; 32. Limiting plate; 33. Ring plate; 34. Cover plate; 35. Perforated plate; 36. Connecting column; 37. Magnet; 4. Installation mechanism; 41. Base block; 42. Support plate; 43. Hydraulic cylinder; 44. Push block; 45. Slide plate; 5. Connecting block; 6. Groove; 7. Stud; 8. Clamping block; 9. Insert plate; 10. Limiting column; 11. Limiting groove. Detailed Implementation
[0026] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.
[0027] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.
[0028] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.
[0029] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.
[0030] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.
[0031] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.
[0032] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.
[0033] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0034] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.
[0035] Example: Figures 1-5 As shown, this utility model discloses a raw material fabric loosening device for underwear processing, including a loosening machine body 1, a base 2 fixed at the bottom end of the loosening machine body 1, a limiting mechanism 3 on the outer wall of the loosening machine body 1, and an installation mechanism 4 at the top end of the base 2.
[0036] Limiting mechanism 3 includes:
[0037] The iron column 31 is fixed to the outer wall of the main body 1 of the fabric loosening machine on both sides. Two limiting plates 32 are provided at the top of the iron column 31 to facilitate contact between one side of the limiting plate 32 and the outer wall of the moving raw material fabric. Both limiting plates 32 slide against the outer wall of the main body 1 of the fabric loosening machine. A ring plate 33 is fixed to the bottom end of each of the two limiting plates 32, and the inner wall of each ring plate 33 slides against the outer wall of the iron column 31. A cover plate 34 is fixed to one side of each of the two limiting plates 32, so that the outer wall of the connecting block 5 fixed to one side of the cover plate 34 engages with the inner wall of the groove 6 to protect the contact point between the limiting plate 32 and the raw material fabric, preventing the fabric edge from slipping. The curling at the edge affects the normal operation of the device. Both cover plates 34 are set above the main body 1 of the cloth loosening machine. The outer walls of both limit plates 32 are fixed with perforated plates 35. The inner walls of both perforated plates 35 are fitted with connecting posts 36. The bottom ends of both connecting posts 36 are fixed with magnets 37. The outer walls of both magnets 37 are magnetically attracted to the top of the iron post 31. The operator slides the two limit plates 32 on the outer wall of the main body 1 of the cloth loosening machine until one side of the limit plate 32 contacts the outer wall of the raw material cloth moving on it, and installs the cover plate 34 on one side of the limit plate 32, so that the outer wall of the connecting block 5 fixed on one side of the cover plate 34 is in contact with the groove 6. The inner wall of the limiting plate 32 is engaged to protect the contact point between the limiting plate 32 and the raw material cloth, preventing the cloth edges from rolling up and affecting the normal operation of the device. This facilitates the fitting of the outer wall of the connecting column 36 with the inner wall of the perforated plate 35, allowing the magnet 37 fixed at the bottom of the connecting column 36 to magnetically attract the top of the iron column 31. This magnetic attraction ensures that the limiting plate 32 is securely installed on the outer wall of the cloth loosening machine body 1, thereby ensuring the stable sliding of the raw material cloth on the cloth loosening machine body 1. The raw material cloth is loosened at the top of the support plate 42 until it is driven to move. This prevents the raw material cloth from being disturbed by external forces during its movement on the main body 1 of the loosening machine, which would cause the angle of the raw material cloth to deviate. This allows the device to better loosen the raw material cloth for underwear processing. The inner walls of the two connecting columns 36 are threaded with studs 7. One end of each stud 7 is threaded with the inner wall of the limiting plate 32, which facilitates the magnetic attraction between the magnet 37 and the iron column 31. After the connecting column 36 is installed, it is stably installed above the iron column 31, preventing the connecting column 36 from sliding on the inner wall of the perforated plate 35 due to external force. This allows the magnet 37 to be firmly installed at the top of the iron column 31.
[0038] As attached Figure 3As shown, a connecting block 5 is fixed on one side of each of the two cover plates 34, and two grooves 6 are opened on the outer wall of each of the two limiting plates 32. The inner wall of each groove 6 is matched with the outer wall of the connecting block 5, so that the workers can quickly install and remove the cover plate 34 from the outer wall of the limiting plate 32. This allows the cover plate 34 to be replaced after wear, and avoids cracking that would affect the protective effect of the device on the contact between the limiting plate 32 and the raw material cloth.
[0039] As attached Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the mounting mechanism 4 includes:
[0040] The base block 41 has its bottom end fixed to the top end of the base 2. A support plate 42 slides on the top end of the base block 41. A hydraulic cylinder 43 is fixed to one side of the base block 41, and a push block 44 is fixed to the output end of the hydraulic cylinder 43. This facilitates the stable sliding of the support plate 42 on the outer wall of the base block 41, allowing the support plate 42 to move back and forth stably on the outer wall of the base block 41. This avoids manual operation by the operator, reduces the operator's workload, improves the operator's work efficiency, and helps to better and more securely place the support plate 42 on the base block 41, preventing positional displacement caused by manual operation. The outer wall of the push block 44 slides against the inner wall of the base block 41, and one side of the push block 44 is fixed to one side of the support plate 42. The inner wall of the base block 41 has two sliding plates 45, the tops of which are fixed to the bottom of the support plate 42. This facilitates the control of the output end of the hydraulic cylinder 43 to drive the push block 44 to slide on the inner wall of the base block 41, thereby driving the support plate 42 to slide on the base block 41. At the same time, the two sliding plates 45 fixed to the bottom of the support plate 42 slide on the inner wall of the base block 41 until one side of the support plate 42 is moved to abut against the outer wall of the base block 41. This ensures that the support plate 42 is stably installed on the outer wall of the base block 41, so that the operator can control the main body 1 of the loosening machine to stably place the raw materials for underwear processing on the top of the support plate 42, avoiding external interference that could cause the support plate 42 to move on the base block 41.
[0041] As attached Figure 1 , Figure 2 and Figure 5As shown, clamping blocks 8 are provided on both sides of the support plate 42. Insert plates 9 are fixed to one side of each clamping block 8, facilitating the engagement of the outer wall of the clamping block 8 with one side of the support plate 42. This further ensures the fastening of the support plate 42 on the base block 41 after its installation, preventing accidental operation of the hydraulic cylinder 43 to push the support plate 42 onto the base block 41. This effectively ensures the stability of the internal structure of the device. The outer walls of the two insert plates 9 are fitted into the inner wall of the main body 1 of the cloth loosening machine. Several limiting posts 10 are fixed to the outer walls of the two clamping blocks 8. Several limiting grooves 11 are opened on both sides of the support plate 42. The inner walls are all matched with the outer walls of the limiting posts 10. Two insert plates 9 are respectively fitted onto the inner walls of the main body 1 of the loosening machine, so that the clamping block 8 fixed on one side of the insert plate 9 slides on the outer wall of the bottom block 41, so that the outer wall of the clamping block 8 engages with one side of the support plate 42 until the limiting post 10 fixed on the outer wall of the clamping block 8 matches the inner wall of the limiting groove 11. This makes it easy to install the support plate 42 on the upper limit of the bottom block 41, further strengthening the stability of the support plate 42 and the outer wall of the bottom block 41, and preventing the support plate 42 from moving above the bottom block 41 due to external impact. Therefore, the raw material cloth is better stacked on the top of the support plate 42 after loosening, which is conducive to the normal use of the device.
[0042] Working Principle: During use, the output end of the hydraulic cylinder 43 drives the push block 44 to slide on the inner wall of the base block 41, thereby driving the support plate 42 to slide on the base block 41. Simultaneously, the two sliding plates 45 fixed at the bottom of the support plate 42 slide on the inner wall of the base block 41 until one side of the support plate 42 is moved to abut against the outer wall of the base block 41. Two insert plates 9 are then fitted onto the inner wall of the loosening machine body 1, causing the clamping block 8 fixed on one side of the insert plate 9 to slide on the outer wall of the base block 41. This allows the outer wall of the clamping block 8 to engage with one side of the support plate 42 until the limiting post 10 fixed on the outer wall of the clamping block 8 matches the inner wall of the limiting groove 11. This ensures the support plate 42 is securely installed on the outer wall of the base block 41, allowing the operator to control the loosening machine body 1 to stably place the raw materials for underwear processing on the top of the support plate 42, preventing external interference that could cause the support plate 42 to move on the base block 41. This also facilitates quick handling of the raw materials after loosening. Two limiting plates 32 slide on the outer wall of the loosening machine body 1 until one side of the limiting plate 32 contacts the outer wall of the raw material cloth moving on it. A cover plate 34 is installed on one side of the limiting plate 32, so that the outer wall of the connecting block 5 fixed on one side of the cover plate 34 engages with the inner wall of the groove 6 to protect the contact point between the limiting plate 32 and the raw material cloth, and to prevent the edge of the cloth from rolling up and affecting the normal operation of the device. The outer wall of the connecting column 36 is fitted with the inner wall of the perforated plate 35, so that the magnet 37 fixed at the bottom of the connecting column 36 is magnetically attracted to the top of the iron column 31. Therefore, the limiting plate 32 is firmly installed on the outer wall of the loosening machine body 1, thereby ensuring that the raw material cloth slides stably on the loosening machine body 1 until the raw material cloth is loosened at the top of the support plate 42. This avoids the raw material cloth from being disturbed by external forces during its movement on the loosening machine body 1, which would cause the angle of the raw material cloth to deviate. Therefore, it is beneficial for the device to better loosen the raw material cloth for underwear processing.
[0043] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.
Claims
1. A fabric loosening device for processing underwear, comprising a fabric loosening machine body (1), wherein a base (2) is fixed to the bottom end of the fabric loosening machine body (1), characterized in that, The outer wall of the main body (1) of the loosening machine is provided with a limiting mechanism (3), and the top of the base (2) is provided with an installation mechanism (4); The limiting mechanism (3) includes: The iron column (31) is fixed to the outer wall of the main body (1) of the cloth loosening machine on both sides. The top of the iron column (31) is provided with two limiting plates (32). The two limiting plates (32) slide against the outer wall of the main body (1) of the cloth loosening machine. The bottom of the two limiting plates (32) is fixed with a ring plate (33). The inner wall of the two ring plates (33) slides against the outer wall of the iron column (31). The side of the two limiting plates (32) is fixed with a cover plate (34). The two cover plates (34) are set above the main body (1) of the cloth loosening machine.
2. The raw material fabric loosening device for underwear processing according to claim 1, characterized in that, Both of the limiting plates (32) have a perforated plate (35) fixed on their outer walls, and both of the perforated plates (35) have a connecting post (36) fitted on their inner walls. Both of the connecting posts (36) have a magnet (37) fixed at their bottom ends, and both of the magnets (37) have a magnetic attraction to the top of the iron post (31) on their outer walls.
3. The raw material fabric loosening device for underwear processing according to claim 1, characterized in that, A connecting block (5) is fixed on one side of each of the two shields (34), and two grooves (6) are opened on the outer wall of each of the two limiting plates (32), and the inner wall of each groove (6) is matched with the outer wall of the connecting block (5).
4. The raw material fabric loosening device for underwear processing according to claim 2, characterized in that, Both connecting posts (36) have threaded studs (7) on their inner walls, and one end of each stud (7) is threaded to the inner wall of the limiting plate (32).
5. A raw material fabric loosening device for underwear processing according to claim 1, characterized in that, The installation mechanism (4) includes: The bottom block (41) is fixed to the top of the base (2). A support plate (42) slides on the top of the bottom block (41). A hydraulic cylinder (43) is fixed on one side of the bottom block (41). A push block (44) is fixed at the output end of the hydraulic cylinder (43). The outer wall of the push block (44) slides against the inner wall of the bottom block (41). One side of the push block (44) is fixed to one side of the support plate (42).
6. A raw material fabric loosening device for underwear processing according to claim 5, characterized in that, The inner wall of the base block (41) has two sliding plates (45), the tops of which are fixed to the bottom of the support plate (42).
7. A raw material fabric loosening device for underwear processing according to claim 5, characterized in that, Both sides of the support plate (42) are provided with clamping blocks (8), and one side of each of the two clamping blocks (8) is fixed with an insert plate (9). The outer walls of the two insert plates (9) are fitted with the inner wall of the loosening machine body (1).
8. A raw material fabric loosening device for underwear processing according to claim 7, characterized in that, The outer walls of the two clamping blocks (8) are fixed with several limiting posts (10), and the two sides of the support plate (42) are provided with several limiting grooves (11), and the inner walls of the several limiting grooves (11) are matched with the outer walls of the limiting posts (10).