A buttonhole sewing machine

Abstract

This application relates to a buttonhole sewing machine, belonging to the field of washing machine production equipment. It includes a frame, a movable frame, a drive unit, and a buttoning die. The frame has a platform with one end empty and horizontally suspended. The movable frame is mounted on the frame and located above the platform, and can move up and down relative to the platform. The drive unit is mounted on the frame and drives the movable frame to move. The buttoning die is located between the platform and the movable frame, and includes a lower die, a connecting die, and an upper die arranged vertically from bottom to top. The lower die is fixed to the platform, and its upper surface is a folding edge seat surface. The connecting die is slidably connected to the lower die and slides up and down within it. Its lower surface is a folding edge pressing surface that mates with the upper surface of the upper die. The upper surface of the connecting die is a pressing rib seat surface. The upper die is fixed to the lower surface of the movable frame, and its lower surface is a pressing rib pressing surface that mates with the upper surface of the connecting die. This application provides a reliable and efficient edge connection for the stainless steel drum of the washing machine.

Description

Technical Field

[0001] This application relates to the field of washing machine manufacturing equipment, and in particular to a sewing machine. Background Technology

[0002] The inner tub is one of the main structures of a washing machine. Common washing machine inner tubs mainly consist of an inner stainless steel drum and an outer plastic water tank. The stainless steel drum is made by rolling pre-cut rectangular stainless steel sheets into a curved, near-cylindrical shape using a rolling device, and then welding or riveting the two sides together to form a cylinder.

[0003] However, welding stainless steel drums is energy-intensive and requires post-processing at the weld joints, while riveting is complex and lacks reliability. Therefore, it is necessary to improve the overlapping connection method of stainless steel drums in washing machines and design corresponding production and processing equipment. Utility Model Content

[0004] In order to achieve reliable and efficient overlapping connections of the stainless steel drum of a washing machine, this application provides a seam-sealing machine.

[0005] The fastening sewing machine provided in this application adopts the following technical solution: A buttonhole sewing machine, comprising: A frame, which has a machine base that is left unattended and horizontally suspended at one end. A movable frame is disposed on the frame and located above the machine platform, and the movable frame can move up and down relative to the machine platform, either closer to or further away from it. A drive unit, which is mounted on the frame, drives the moving frame to move; A pressing die is disposed between the machine base and the movable frame, and includes a lower die, a connecting die and an upper die arranged vertically from bottom to top; The lower mold is fixed on the machine base, and the upper surface of the lower mold is a folding seat surface; The connecting mold is slidably connected to the lower mold, and the connecting mold slides up and down in the lower mold. The lower surface of the connecting mold is a folded pressing surface that mates with the upper surface of the upper mold. The upper surface of the connecting mold is a rib seat surface, the upper mold is fixed to the lower surface of the movable frame, and the lower surface of the upper mold is a rib pressing surface that mates with the upper surface of the connecting mold.

[0006] During the seam-fastening operation, the two connecting sides of the stainless steel cylinder are placed between the lower mold and the connecting mold. The driving device drives the moving frame to move downward and moves the upper mold downward to press against the connecting mold, causing the connecting mold to move downward and cooperate with the lower mold to bend the two connecting sides of the stainless steel cylinder in the opposite direction. After the two connecting sides of the stainless steel cylinder are fastened together, they are placed on the upper surface of the connecting mold. The driving device drives the moving frame to move downward and moves the upper mold downward to press against the connecting mold, causing the fastened joint of the two connecting sides of the stainless steel cylinder to deform and generate a rib structure.

[0007] By adopting the above scheme, the machine frame has a horizontally suspended platform with one end empty, providing ample operating space for the placement and processing of stainless steel cylinders. This allows the stainless steel cylinders to be easily placed on the platform for subsequent seam-fastening operations. The movable frame is set on the machine frame and located above the platform, allowing it to move up and down relative to the platform. The drive device is used to move the movable frame. Through the action of the drive device, the movable frame can precisely drive the upper die to move up and down, thereby realizing the cooperation between the upper die, lower die, and connecting die to complete the bending and crimping operations on both sides of the stainless steel cylinder connection. The crimping die includes a lower die, a connecting die, and an upper die arranged vertically from bottom to top. The lower die is fixed on the platform, and its upper surface is a folding seat surface, providing a supporting base for bending the two sides of the stainless steel cylinder connection. When cooperating with the connecting die, it can accurately bend the two sides of the connection in the opposite direction. The connecting mold is slidably connected to the lower mold and can slide vertically. Its lower surface is a folded edge pressing surface that mates with the upper surface of the upper mold. Under the pressure of the upper mold, it mates with the folded edge seat surface of the lower mold to achieve reverse bending of the two connecting sides. The upper surface of the connecting mold is a rib pressing surface. After the two connecting sides are fastened, it mates with the rib pressing surface of the upper mold to create a rib structure at the fastening point. The upper mold is fixed to the lower surface of the moving frame. Its lower surface is a rib pressing surface that mates with the upper surface of the connecting mold. Driven by the moving frame, it mates with the rib pressing surface of the connecting mold to perform rib pressing at the fastening point. Through the step-by-step cooperation of the lower mold, connecting mold, and upper mold, the fastening and rib pressing of the two connecting sides are achieved without the need for traditional welding or complex riveting methods. By bending and fastening in the opposite direction and then pressing the ribs, a stable rib structure is formed at the fastening points on both sides of the stainless steel drum. This connection method has high strength and stability, ensuring the reliability of the stainless steel drum connection and meeting the strength requirements of the washing machine during use. It also achieves efficient processing of both sides of the stainless steel drum connection, reduces processes and time, improves production efficiency, and is suitable for large-scale industrial production.

[0008] Preferably, the lower mold includes a first fixed base and a folding lower mold. The first fixed base is fixed to the machine base and forms a first mounting groove in the middle. The folding lower mold is inserted into the first mounting groove and fixed. The upper surface of the folding lower mold is a folding seat surface. A guide groove is provided in the middle of the folding lower mold. The lower end of the connecting mold is inserted into the guide groove and slides up and down along the guide groove.

[0009] By adopting the above scheme, the lower mold is divided into a first fixed base and a bending lower mold. The first fixed base is fixed to the machine base and forms a first mounting groove. The bending lower mold is inserted into the mounting groove and fixed. At the same time, a guide groove is opened in the bending lower mold for the connecting mold to slide. The modular design makes the lower mold structure more flexible, and the guide groove provides precise guidance for the connecting mold, ensuring the stability and accuracy of the connecting mold when sliding up and down. This makes the reverse bending and rib pressing operations more precise, further solving the problems of complex operation and insufficient reliability in traditional connection methods, while improving the processing accuracy and stability of the equipment.

[0010] Preferably, an elastic component is provided in the guide groove. The elastic component is compressed and deformed when the connecting mold slides downward, and the elastic component restores its deformation and resets the connecting mold when the upper mold moves upward.

[0011] By adopting the above scheme and setting an elastic component in the guide groove, when the connecting mold slides downward under the action of the drive device and the upper mold, the elastic component is compressed and deformed by the pressure of the connecting mold, storing elastic potential energy. When the upper mold moves upward after completing the pressing operation, the elastic component, which has lost the pressure of the upper mold, begins to recover its deformation, releasing the stored elastic potential energy and pushing the connecting mold to slide upward and reset along the guide groove. The elastic reset mechanism replaces the traditional mechanical or manual reset method, solving the problem of untimely and inaccurate reset of the connecting mold after completing a stitching operation. This ensures the coordinated movement of each component of the stitching machine during processing, improves the continuity and stability of equipment operation, and further guarantees the accuracy and efficiency of processing the two sides of the stainless steel cylinder connection.

[0012] Preferably, the connecting mold includes an upper folding mold and a lower pressing mold. The lower end of the upper folding mold is inserted into the guide groove and slides up and down along the guide groove. The upper end of the upper folding mold is provided with a second mounting groove, and the lower pressing mold is fixed in the second mounting groove.

[0013] By adopting the above solution, and designing the connecting mold as a combination of an upper folding mold and a lower pressing mold, during the seam-sealing operation, the upper folding mold first cooperates with the lower mold to complete the reverse bending and seaming of the two sides of the stainless steel cylinder connection. Subsequently, the lower pressing mold cooperates with the pressing surface of the upper mold to complete the pressing operation. By integrating the folding and pressing molds, the seam-sealing and pressing can be completed by moving the same piece of equipment a short distance.

[0014] Preferably, the upper mold includes a second fixed seat and a pressure rib upper mold. The second fixed seat is fixed to the lower surface of the movable frame, and a third mounting groove is provided at the lower middle part of the second fixed seat. The pressure rib upper mold is fixed in the third mounting groove.

[0015] By adopting the above scheme, the second fixed seat is fixed to the lower surface of the moving frame, and the third mounting groove at the lower end fixes the upper rib mold. During the rib-pressing operation, the upper rib mold moves down with the moving frame, and its rib pressing surface mates with the rib seat surface of the connecting mold, applying precise pressure to the connecting edge of the stainless steel cylinder after it is snapped together, so that a stable rib structure is formed at the snap-on joint. By separating the fixed support and rib-pressing function of the upper mold through modular design, the problems of inconsistent rib depth and irregular shape caused by uneven force during rib-pressing in traditional integrated upper molds are solved. Through precise pressure transmission and positioning, the stability and reliability of the rib-pressing operation are ensured.

[0016] Preferably, support rods are provided on both sides of the machine base, and the length direction of the support rods is horizontal.

[0017] By adopting the above solution, horizontal support rods are installed on both sides of the machine tool. The rigid support of these rods balances the bending moment generated by the machine tool under the load of the stainless steel cylinder and processing pressure when it is horizontally suspended. When the stainless steel cylinder is placed on the machine tool, the support rods can share the weight of the cylinder and the lateral forces generated during processing, preventing the machine tool from twisting or deforming due to uneven stress. This solves the problem of insufficient structural stability of traditional suspended machine tools under heavy load conditions. Simultaneously, the horizontally extending support rods provide auxiliary support surfaces for the stainless steel cylinder, facilitating adjustments by operators during cylinder positioning and clamping, thus improving the convenience of processing operations.

[0018] Preferably, the support rod is a telescopic rod.

[0019] By adopting the above solution, and designing the support rod as a telescopic structure, the length of the telescopic rod can be flexibly adjusted according to the diameter of the stainless steel cylinder and processing requirements. When processing cylinders of different diameters, operators can adjust the length of the telescopic rod to change the support position and support range, ensuring that the support rod remains in close contact with the cylinder surface and provides stable support force.

[0020] Preferably, it also includes a support frame, which is disposed below the machine base and is used to support the stainless steel cylinder.

[0021] By adopting the above solution, a support frame is installed under the machine base, providing additional support for the stainless steel cylinder through its lifting effect. When the stainless steel cylinder is placed on the machine base, the support frame, the machine base, and the support rod form a three-dimensional support structure, jointly sharing the weight of the cylinder and the vertical pressure generated during processing, preventing the cylinder from sagging due to its own weight or deformation caused by processing pressure. This multi-dimensional support method solves the problems of large-diameter cylinders easily sagging and small-diameter cylinders being difficult to position when relying solely on top support in traditional machine bases. It also provides auxiliary support for cylinder loading and unloading, reduces the labor intensity of operators, ensures the stability of the cylinder's position during processing, and thus improves the seam sealing accuracy and equipment applicability.

[0022] Preferably, the support frame includes a tray and a lifting guide rail. The tray is arc-shaped, with its opening facing the machine base and positioned below the machine base. The lifting guide rail is fixed to the machine frame and slidably connected to one end of the tray. The tray can move up and down along the lifting guide rail.

[0023] By adopting the above solution, the support frame is designed as a combination of an arc-shaped support plate and a lifting guide rail. The arc-shaped support plate fits the curved surface of the stainless steel cylinder, achieving uniform support for the cylinder. At the same time, the height of the support plate can be adjusted by the lifting guide rail, which helps operators lift the stainless steel cylinder upwards after folding, saving manpower and improving processing efficiency.

[0024] In summary, this application has the following beneficial effects: 1. The modular design splits the lower mold into a first fixed seat and a folding lower mold. The guide groove precisely guides the sliding of the connecting mold, improving the accuracy of reverse bending and rib pressing operations. This solves the problems of complex operation and insufficient reliability of traditional connection methods, and improves the processing accuracy and stability of the equipment. 2. An elastic component is installed in the guide groove to form an elastic reset mechanism, which replaces the traditional mechanical or manual reset, ensuring timely and accurate reset of the connecting mold, ensuring coordinated movement of equipment components, improving operational continuity and stability, and thus ensuring processing accuracy and efficiency; 3. The connecting mold integrates the upper mold for folding and the lower mold for pressing ribs. The upper mold is divided into a second fixing seat and an upper mold for pressing ribs, realizing the modular separation of the folding and pressing rib functions, accurately transmitting pressure, solving the problems of inconsistent pressing rib depth and irregular shape, and ensuring the stability of the pressing rib structure. 4. Telescopic support rods are installed on both sides of the machine to balance the bending moment of the suspended machine, avoid deformation under stress, provide auxiliary support for cylinders of different diameters, and improve the convenience of operation; a support frame consisting of an arc-shaped tray and a lifting guide rail is installed under the machine to form a three-dimensional support structure, which prevents cylinder deformation, reduces labor intensity, improves the seam accuracy and equipment applicability, and realizes efficient processing and large-scale production. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of a buttonhole sewing machine according to an embodiment of this application; Figure 2 This is a side view of a buttonhole sewing machine according to an embodiment of this application; Figure 3 This is a schematic diagram of the machine base, pressing mold, and support frame of a buttonhole sewing machine according to an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures: 1. Machine frame; 11. Machine base; 2. Mobile frame; 3. Drive unit; 4. Pressing mold; 41. Lower mold; 411. First fixed seat; 412. Folding lower mold; 413. First mounting groove; 414. Folding seat surface; 415. Guide groove; 42. Connecting mold; 421. Upper folding mold; 422. Lower pressing rib mold; 423. Elastic component; 424. Second mounting groove; 43. Upper mold; 431. Second fixing seat; 432. Upper mold with rib; 433. Third mounting groove; 5. Support frame; 51. Pallet; 52. Lifting guide rail; 6. Support rod. Detailed Implementation

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "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 accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0033] Reference Figure 1 Embodiment 1 of this application discloses a buttonhole sewing machine, including a frame 1, a movable frame 2, a drive device 3, a buttoning mold 4, and a support frame 5.

[0034] Reference Figure 2 as well as Figure 3 The frame 1 is a frame-type support with an opening on one side. A machine platform 11 is connected to the middle side of the frame 1, and the machine platform 11 is horizontally suspended with one end unoccupied. A movable frame 2 is located at the upper end of the frame 1, directly above the machine platform 11. The movable frame 2 can move up and down relative to the machine platform 11. A drive device 3 is mounted on the frame 1 and drives the movable frame 2 to move. Specifically, the drive device 3 can be a hydraulic telescopic cylinder, and the movable frame 2 can be connected to the frame 1 via the hydraulic telescopic cylinder. Support rods 6 are provided on both sides of the machine platform 11, and the length direction of the support rods 6 is horizontal. The support rods 6 can be telescopic rods with length-direction extension and retraction, specifically, they can be hydraulic telescopic cylinders.

[0035] Reference Figure 3 The support frame 5 is located directly below the machine base 11 and is used to support the stainless steel cylinder. The support frame 5 includes a support plate 51 and a lifting guide rail 52. The support plate 51 is arc-shaped and its opening faces the machine base 11. The lifting guide rail 52 is fixed to the machine frame 1 and slidably connected to one end of the support plate 51. The support plate 51 can move up and down along the lifting guide rail 52. At the same time, the height of the support plate 51 can be adjusted by the lifting guide rail 52 to assist the operator in lifting the stainless steel cylinder upward after folding.

[0036] Reference Figures 1 to 3 The pressing mold 4 is located between the machine base 11 and the movable frame 2, and includes a lower mold 41, a connecting mold 42 and an upper mold 43 arranged vertically from bottom to top. The lower mold 41 and the connecting mold 42 cooperate to perform edge bending, and the connecting mold 42 and the upper mold 43 cooperate to perform riveting.

[0037] Reference Figure 3 The lower mold 41 includes a first fixed base 411 and a folding lower mold 412. The first fixed base 411 is fixed to the machine base 11 and forms a first mounting groove 413 in the middle. The folding lower mold 412 is inserted into the first mounting groove 413 and can be fixed by screws on the side in the length direction. The two ends of the first mounting groove 413 in the length direction are blocked and limited by screws, thereby fixing the folding lower mold 412 to the machine base 11. The upper surface of the folding lower mold 412 is a folding seat surface 414. A guide groove 415 is opened in the middle of the folding lower mold 412. The connecting mold 42 includes a folding upper mold 421 and a pressing lower mold 422. The lower end of the folding upper mold 421 is inserted into the guide groove 415 and slides up and down along the guide groove 415. An elastic component 423 is provided in the guide groove 415. The elastic component 423 is compressed and deformed when the connecting mold 42 slides downward, and when the upper mold 43 moves upward, the elastic component 423 restores its deformation, causing the connecting mold 42 to return to its original position. Specifically, the elastic component 423 can be a guide pin fitted with a spring. A slot is opened at the lower end of the folding upper mold 421, and the upper end of the guide pin is inserted into the slot. The two ends of the spring abut against the bottom surface of the folding upper mold 421 and the bottom surface of the guide groove 415, respectively. A second mounting groove 424 is opened at the upper end of the folding upper mold 421, and the pressing rib lower mold 422 is fixed in the second mounting groove 424. The upper mold 43 includes a second fixing seat 431 and a pressing rib upper mold 432. The second fixing seat 431 is fixed to the lower surface of the moving frame 2, and a third mounting groove 433 is opened at the middle of the lower end of the second fixing seat 431, and the pressing rib upper mold 432 is fixed in the third mounting groove 433.

[0038] The implementation principle of a buttonhole sewing machine according to an embodiment of this application is as follows: the two connecting sides of the stainless steel cylinder are placed between the lower mold 41 and the connecting mold 42. The driving device 3 drives the moving frame 2 to move downward and drives the upper mold 43 to move downward and press against the connecting mold 42, so that the connecting mold 42 moves downward and cooperates with the lower mold 41 to bend the two connecting sides of the stainless steel cylinder in the opposite direction. After the two connecting sides of the stainless steel cylinder are fastened together, they are placed on the upper surface of the connecting mold 42. The driving device 3 drives the moving frame 2 to move downward and drives the upper mold 43 to move downward and press against the connecting mold 42, so that the fastening point of the two connecting sides of the stainless steel cylinder is deformed to generate a rib structure.

[0039] The embodiments of this application have the effect of achieving a reliable and efficient overlapping connection of the stainless steel drum of the washing machine.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A buttonhole sewing machine, characterized in that, include: The frame (1) has a machine base (11) that is left unattended and horizontally suspended at one end. A movable frame (2) is disposed on the frame (1) and located above the machine platform (11). The movable frame (2) can move up and down relative to the machine platform (11) by moving closer to or further away from it. A drive device (3) is mounted on the frame (1) and drives the moving frame (2) to move. A pressing mold (4) is disposed between the machine base (11) and the movable frame (2), and includes a lower mold (41), a connecting mold (42) and an upper mold (43) arranged vertically from bottom to top; The lower mold (41) is fixed on the machine base (11), and the upper surface of the lower mold (41) is the folding seat surface (414); The connecting mold (42) is slidably connected to the lower mold (41), and the connecting mold (42) can slide up and down in the lower mold (41). The lower surface of the connecting mold (42) is a folded pressing surface that cooperates with the upper surface of the upper mold (43). The upper surface of the connecting mold (42) is a rib seat surface, the upper mold (43) is fixed to the lower surface of the movable frame (2), and the lower surface of the upper mold (43) is a rib pressing surface that cooperates with the upper surface of the connecting mold (42); Support frame (5) is located directly below the machine base (11); Support rods (6) are provided on both sides of the machine base (11).

2. The buttonhole sewing machine according to claim 1, characterized in that, The lower mold (41) includes a first fixed base (411) and a folding lower mold (412). The first fixed base (411) is fixed on the machine base (11) and a first mounting groove (413) is formed in the middle. The folding lower mold (412) is inserted into the first mounting groove (413) and fixed. The upper surface of the folding lower mold (412) is a folding seat surface (414). A guide groove (415) is provided in the middle of the folding lower mold (412). The lower end of the connecting mold (42) is inserted into the guide groove (415) and slides up and down along the guide groove (415).

3. A buttonhole sewing machine according to claim 2, characterized in that, An elastic component (423) is provided in the guide groove (415). The elastic component (423) is compressed and deformed when the connecting mold (42) slides downward. When the upper mold (43) moves upward, the elastic component (423) restores its deformation and resets the connecting mold (42).

4. A buttonhole sewing machine according to claim 2, characterized in that, The connecting mold (42) includes an upper folding mold (421) and a lower pressing mold (422). The lower end of the upper folding mold (421) is inserted into the guide groove (415) and slides up and down along the guide groove (415). The upper end of the upper folding mold (421) is provided with a second mounting groove (424), and the lower pressing mold (422) is fixed in the second mounting groove (424).

5. A buttonhole sewing machine according to claim 4, characterized in that, The upper mold (43) includes a second fixed seat (431) and a rib upper mold (432). The second fixed seat (431) is fixed on the lower surface of the movable frame (2). A third mounting groove (433) is provided in the middle of the lower end of the second fixed seat (431). The rib upper mold (432) is fixed in the third mounting groove (433).

6. A buttonhole sewing machine according to claim 1, characterized in that, The machine base (11) is provided with support rods (6) on both sides, and the length direction of the support rods (6) is horizontal.

7. A buttonhole sewing machine according to claim 1, characterized in that, The support rod (6) is a telescopic rod.

8. A buttonhole sewing machine according to claim 1, characterized in that, It also includes a support frame (5), which is located below the machine base (11) and is used to support the stainless steel cylinder.

9. A buttonhole sewing machine according to claim 1, characterized in that, The support frame (5) includes a tray (51) and a lifting guide rail (52). The tray (51) is arc-shaped, and the opening of the tray (51) faces the machine base (11) and is located below the machine base (11). The lifting guide rail (52) is fixed on the machine frame (1) and slidably connected to one end of the tray (51). The tray (51) can move up and down along the lifting guide rail (52).

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