A continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces

Abstract

The present application relates to high temperature mesh belt furnace technical field, specifically for a kind of continuous high temperature mesh belt furnace for high-strength stainless steel workpiece heat treatment, including furnace body, mesh belt, chain and the dismounting roller assembly for driving chain;It further includes press roller assembly, it includes fixedly installed on the press roller of furnace body, and the cleaning notch being opened in the bottom of press roller, when the mesh belt installation is completed, dismounting roller assembly makes mesh belt one end tilt towards the direction of cleaning notch, when mesh belt moves, cleaning notch passively cleans mesh belt surface impurity, and when mesh belt crosses press roller, it will be inclined correction by press roller, through dismounting roller assembly, mesh belt can be replaced by user, and the center distance adjustment of double roller and the intervention of tensioning mechanism are not needed, under the cooperation of press roller, mesh belt's steering end and cleaning notch also can be in inclined receiving state, it is convenient for cleaning notch to clean impurity, and by the cooperation of supporting assembly, it can further strengthen the cleaning of stubborn impurity.

Description

Technical Field

[0001] This invention relates to the field of high-temperature mesh belt furnace technology, specifically a continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces. Background Technology

[0002] Heat treatment of stainless steel refers to a key process in which the internal structure and phase composition of the material are changed in the solid state by precisely controlling the heating temperature, holding time and cooling rate, thereby improving its mechanical properties, corrosion resistance and dimensional stability. It usually uses a mesh belt furnace to move the workpiece intermittently or continuously and carry out heat treatment through a temperature-controlled heating zone.

[0003] Patent document CN112524942B discloses a continuous sealed high-temperature mesh belt furnace, including a furnace body and a frame. Its features include a feeding and propulsion mechanism at the front end of the furnace body, a double-door front discharge replacement chamber, and a sealed mesh belt drive chamber; a water-cooled section at the rear end of the furnace body, a sealed mesh belt rotation chamber, a sealed discharge drive roller group, a double-door rear discharge replacement chamber, a material movement mechanism, and a material circulation conveying mechanism. This application, through the effective connection and arrangement of various components, enables continuous production, achieving lower energy consumption than conventional mesh belt furnaces and greater production capacity than vacuum furnaces.

[0004] In the prior art of the aforementioned patent, stainless steel workpieces need to be transported to the heating zone by a mesh belt. The mesh belt is driven by a chain connected to it, and the chain is driven by a sprocket to move the mesh belt. However, during use, sulfur and chloride ions in the heat treatment atmosphere react with chromium elements in the mesh belt to generate brittle compounds, or metal chips carried by the workpiece are embedded in the mesh belt gaps, resulting in lateral stiffness imbalance, increasing the probability of deviation, increasing mesh belt wear, and reducing its service life. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces, comprising a furnace body, a mesh belt, a chain, and a disassembly and assembly roller assembly for driving the chain; It also includes a pressure roller assembly, which includes a pressure roller fixedly installed on the furnace body and a cleaning groove opened at the bottom of the pressure roller. When the mesh belt is installed, the disassembly roller assembly will cause one end of the mesh belt to tilt toward the cleaning groove. When the mesh belt moves, the cleaning groove passively cleans the impurities on the surface of the mesh belt. When the mesh belt passes the pressure roller, it will be tilted and corrected by the pressure roller to improve the conveying stability.

[0007] Preferably, the disassembly and assembly roller assembly includes a drive module and an extension module. The drive module includes a servo motor fixedly installed on one side of the furnace body and a rotating shaft fixedly connected to the output shaft of the servo motor. Both ends of the rotating shaft are fixedly installed with sprockets, and the sprockets mesh with the chain.

[0008] Preferably, the expansion module includes slip rings movably mounted on both sides of the rotating shaft, a dual-axis electric push rod is provided inside the rotating shaft, the output shaft of the dual-axis electric push rod is fixedly connected to the slip ring, a support rod is hinged to the outer periphery of the slip ring, and a roller is hinged to the other end of the support rod.

[0009] Preferably, it also includes a cleaning module, which includes an auger movably installed inside the pressure roller, one end of which passes through the pressure roller and extends to the outside of the pressure roller, and a drive mechanism is fixedly installed thereon.

[0010] Preferably, it also includes a support assembly, which includes a support frame disposed inside the furnace body and a first spring fixedly connected to the support frame. The other end of the first spring is fixedly connected to an arc-shaped plate. A wedge block is disposed on one side of the arc-shaped plate. A second spring is fixedly connected to the upper surface of the wedge block. The other end of the second spring is fixedly connected to a support plate.

[0011] Preferably, it also includes a braking compensation component, which includes a roller braking module, a lower mesh belt braking module, and an upper mesh belt braking module. The roller braking module includes a hydraulic cylinder fixedly mounted on the support frame and a brake plate fixedly connected to the output shaft of the hydraulic cylinder. The arc-shaped plate is provided with a clearance groove.

[0012] Preferably, the lower mesh belt braking module includes a first mounting plate fixedly installed on the support frame, and a third spring fixedly connected to the bottom of the hydraulic cylinder. A second mounting plate is fixedly connected to the bottom of the third spring. A brake column is fixedly installed at the bottom of the second mounting plate. Limiting plates are fixedly installed on both sides of the braking plate, and the limiting plates are located below the second mounting plate.

[0013] Preferably, the mesh belt braking module includes a mounting component fixedly mounted on the upper surface of the first mounting plate, and a pressure plate movably mounted with the mounting component. One end of the pressure plate is located below the support plate, and a connecting column is movably mounted on the other end. The bottom of the connecting column is movably mounted with the second mounting plate.

[0014] Preferably, a first T-shaped slider is fixedly installed on one side of the arc-shaped plate, and a T-shaped groove adapted to the first T-shaped slider is provided on the bearing frame.

[0015] Preferably, a second T-shaped slider is fixedly installed on one side of the wedge block, and a slide rail is movably installed on the outer surface of the second T-shaped slider, the slide rail being fixedly connected to the support frame.

[0016] In the above technical solution, the beneficial effects of the present invention are: the user can easily replace the mesh belt by disassembling and assembling the roller assembly, and there is no need for the center distance adjustment of the double rollers and the intervention of the tensioning mechanism. With the cooperation of the pressure roller, the turning end of the mesh belt can be inclined to receive the cleaning groove, which is convenient for cleaning impurities in the cleaning groove. Furthermore, with the cooperation of the support component, the cleaning of stubborn impurities can be further enhanced.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0018] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram showing the positional relationship between the disassembly / assembly roller assembly, the support assembly, and the braking compensation assembly of the present invention. Figure 1 ; Figure 4 This is a schematic diagram showing the positional relationship between the disassembly / assembly roller assembly, the support assembly, and the braking compensation assembly of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the morphological structure of the mesh belt and pressure roller after tensioning according to the present invention; Figure 6 This is a schematic diagram of the disassembly and assembly roller assembly of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the disassembly and assembly roller assembly of the present invention. Figure 2 ; Figure 8 This is a schematic diagram showing the positional relationship between the disassembly / assembly roller assembly, the support assembly, and the braking compensation assembly of the present invention. Figure 3 ; Figure 9 This is a schematic diagram showing the positional relationship between the support component and the braking compensation component of the present invention. Figure 1 ; Figure 10 This is a schematic diagram showing the positional relationship between the support component and the braking compensation component of the present invention. Figure 2 ; Figure 11 This is a schematic diagram of the specific structure of the supporting component of the present invention.

[0020] In the diagram: 1. Furnace body; 11. Mesh belt; 12. Chain; 2. Servo motor; 21. Shaft; 22. Sprocket; 23. Dual-axis electric push rod; 24. Slip ring; 25. Displacement groove; 26. Support rod; 27. Roller; 3. Pressure roller; 31. Cleaning groove; 32. First roller; 33. Transmission belt; 34. Second roller; 35. Screwdriver; 36. Outlet; 4. Bearing frame; 41. First spring; 42. Arc plate ; 43. First T-shaped slider; 44. Slide rail; 45. Second T-shaped slider; 46. Wedge block; 47. Second spring; 48. Support plate; 49. Guide post; 5. Hydraulic cylinder; 51. Brake plate; 52. Relief groove; 53. Limiting plate; 54. First mounting plate; 55. Third spring; 56. Second mounting plate; 57. Brake post; 58. Mounting component; 59. Pressure plate; 510. Through groove; 511. Connecting post. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Example 1: Please refer to Figures 1 to 7 The present invention provides a technical solution: a continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces, comprising a furnace body 1, a mesh belt 11, a chain 12, and a disassembly and assembly roller assembly for driving the chain 12. It also includes a pressure roller assembly, which includes a pressure roller 3 fixedly installed on the furnace body 1 and a cleaning groove 31 opened at the bottom of the pressure roller 3. When the mesh belt 11 is installed, the disassembly roller assembly will cause one end of the mesh belt 11 to tilt toward the cleaning groove 31. When the mesh belt 11 moves, the cleaning groove 31 passively cleans the impurities on the surface of the mesh belt 11. When the mesh belt 11 passes the pressure roller 3, it will be tilted and corrected by the pressure roller 3 to improve the conveying stability.

[0023] The disassembly and assembly roller assembly includes a drive module and an extension module. The drive module includes a servo motor 2 fixedly installed on one side of the furnace body 1, and a rotating shaft 21 fixedly connected to the output shaft of the servo motor 2. Both ends of the rotating shaft 21 are fixedly installed with sprockets 22, which mesh with the chain 12.

[0024] The expansion module includes slip rings 24 movably mounted on both sides of the rotating shaft 21. A dual-axis electric push rod 23 is provided inside the rotating shaft 21. The output shaft of the dual-axis electric push rod 23 is fixedly connected to the slip ring 24. A support rod 26 is hinged to the outer periphery of the slip ring 24. A roller 27 is hinged to the other end of the support rod 26.

[0025] Specifically, in use, the mesh belt first needs to be installed on the outer surface of the roller. For ease of installation, the distance between the two ends of the mesh belt is relatively large compared to the distance between the two rollers. The traditional adjustment method is to adjust the mesh belt tension by changing the center distance between the two rollers after the mesh belt is installed, or to use a tensioning mechanism to intervene in the tensioning. However, the weight of the double rollers is relatively large, and moving and adjusting them is cumbersome. The intervention of the tensioning mechanism increases the stroke of the tensioning mechanism. If over-tensioning occurs in subsequent tensioning adjustments, the effective tensioning force will be drastically reduced, affecting the tensioning effect. In this invention, one end of the mesh belt 11 is first installed on the outer surface of the roller 27, passing over the sprocket 22. The roller driven by the other end of the mesh belt 11 can be a traditional roller that does not require extension. The shaft 21 and the sprocket 22 on the traditional roller are fixed in a detachable manner. After the mesh belt 11 is installed, the sprocket 22 is fixed and made to mesh with the chain 12. This allows for individual replacement of the sprocket 22, avoiding... After wear, the entire roller needs to be replaced, increasing production costs. On the other hand, this avoids increasing the length of the mesh belt 11 that needs to pass over the sprocket 22 during installation, thus reducing the extension stroke of the mesh belt 11. A protrusion is fixedly installed on the inner side of the slip ring 24, and a displacement groove 25 that matches the protrusion is opened on the surface of the rotating shaft 21. By starting the dual-axis electric push rod 23, the slip ring 24 is moved, which drives the support rod 26, thereby causing the roller 27 to extend to the periphery. The pressure roller 3 is installed to cooperate in tensioning the mesh belt 11, which can reduce the extension stroke of the roller 27. This avoids the cumbersome operation of adjusting the center distance of the two rollers and prevents the tensioning mechanism from increasing the stroke too much, thus reducing the tensioning effect. It should be noted that when the mesh belt 11 is extended, the chain 12 will also be extended. When designing the sprocket 22, a tooth groove deepening design should be adopted to increase the tooth height by 15% to compensate for the radial floating generated when the chain 12 is tensioned. Furthermore, when the mesh belt 11 is expanded and tensioned by the roller 27, the turning point where it contacts the roller 27 is higher than other transport parts of the mesh belt 11. That is, the height of the expanded turning end is greater than that of the turning end of the traditional roller. When installing the pressure roller 3, its bottom is made to contact the upper surface of the turning end of the traditional roller. In this way, the pressure roller 3 can correct the slope of the mesh belt 11 caused by expansion, so that the conveying drive of the mesh belt 11 is in a stable state, improving the conveying stability. However, there is still a slope between the end of the mesh belt 11 and the pressure roller 3. When the residue embedded in the mesh belt 11 moves to this point, it will form an angle with the cleaning groove 31. At this time, the residue tilts and is received and removed by the cleaning groove 31, improving the residue removal effect, as shown in the attached instruction manual. Figure 5 As shown at point a in the middle.

[0026] Example 2: Please refer to Figure 2 , Figure 3 and Figure 8It also includes a cleaning module, which includes an auger 35 movably installed inside the pressure roller 3. One end of the auger 35 passes through the pressure roller 3 and extends to the outside of the pressure roller 3, and a drive mechanism is fixedly installed on it.

[0027] It also includes a support assembly, which includes a support frame 4 disposed inside the furnace body 1, and a first spring 41 fixedly connected to the support frame 4. The other end of the first spring 41 is fixedly connected to an arc plate 42. A wedge block 46 is disposed on one side of the arc plate 42. A second spring 47 is fixedly connected to the upper surface of the wedge block 46. The other end of the second spring 47 is fixedly connected to a support plate 48. A first T-shaped slider 43 is fixedly installed on one side of the arc plate 42, and a T-shaped groove adapted to the first T-shaped slider 43 is provided on the bearing frame 4. A second T-shaped slider 45 is fixedly installed on one side of the wedge block 46, and a slide rail 44 is movably installed on the outer surface of the second T-shaped slider 45. The slide rail 44 is fixedly connected to the bearing frame 4. Based on Example 1, during the movement of the mesh belt 11, impurities on it are removed by the pressure roller 3. However, when encountering stubborn impurities that are tightly embedded, the mesh belt 11 deforms downwards under the mutual squeezing of the pressure roller 3 and the impurities, thus passing over the pressure roller 3, making it difficult to clean the stubborn impurities. In this invention, when the roller 27 expands, it drives the arc plate 42, causing the arc plate 42 to squeeze the first spring 41 and generate displacement, thereby driving the wedge block 46. Under the guidance of the slide rail 44 and the second T-shaped slider 45, the wedge block 46... The 6 will move upward, which will drive the support plate 48 to move upward and contact the mesh belt 11. Under the action of the second spring 47, the mesh belt 11 is supported, reducing the downward deformation of the mesh belt 11, assisting the pressure roller 3 in cleaning, and improving the cleaning strength of stubborn residues. The support assembly also includes a guide post 49 movably installed inside the wedge block 46. The top of the guide post 49 is fixedly connected to the support plate 48, which can limit the support plate 48 and prevent the support plate 48 from moving due to the friction of the mesh belt 11, thus affecting the supporting effect on the mesh belt 11 below the pressure roller 3. Furthermore, the driving mechanism in this invention includes a first rotating wheel 32 fixedly connected to the rotating shaft 21, and a transmission belt 33 drivingly connected to the first rotating wheel 32. The other end of the transmission belt 33 is drivingly connected to a second rotating wheel 34, and the second rotating wheel 34 is fixedly connected to the auger 35. An outlet 36 is also provided at the bottom of one end of the pressure roller 3. Impurities collected by the cleaning groove 31 will enter the interior of the pressure roller 3. Driven by the rotating shaft 21, the first rotating wheel 32 will rotate, causing the transmission belt 33 to drive the second rotating wheel 34 to rotate, thereby causing the auger 35 to rotate and transport the impurities inside the pressure roller 3 to the outlet 36 for discharge, so that the cleaning groove 31 can continuously clean impurities.

[0028] Example 3: Please refer to Figures 8 to 11It also includes a braking compensation component, which includes a roller braking module, a lower mesh belt braking module and an upper mesh belt braking module. The roller braking module includes a hydraulic cylinder 5 fixedly installed on the bearing frame 4, and a brake plate 51 fixedly connected to the output shaft of the hydraulic cylinder 5. A clearance groove 52 is provided on the arc plate 42.

[0029] The lower mesh belt braking module includes a first mounting plate 54 fixedly installed on the bearing frame 4, and a third spring 55 fixedly connected to the bottom of the hydraulic cylinder 5. A second mounting plate 56 is fixedly connected to the bottom of the third spring 55. A brake column 57 is fixedly installed at the bottom of the second mounting plate 56. Limiting plates 53 are fixedly installed on both sides of the brake plate 51, and the limiting plates 53 are located below the second mounting plate 56.

[0030] The mesh braking module includes a mounting member 58 fixedly mounted on the upper surface of the first mounting plate 54, and a pressure plate 59 movably mounted with the mounting member 58. One end of the pressure plate 59 is located below the support plate 48, and the other end is movably mounted with a connecting post 511. The bottom of the connecting post 511 is movably mounted with the second mounting plate 56.

[0031] Specifically, after prolonged use, the tensile strength of the conveyor belt gradually decreases under mechanical stress and environmental factors, making it prone to breakage. To prevent the rollers from continuing to drive the conveyor belt and causing it to swing off, tension sensors and clamp-type brakes are usually installed in the rollers to brake them. However, after machining such as cutting and stamping, the stainless steel parts to be processed will have mineral oil-based cutting fluid or stamping oil, or chain and bearing lubricating oil, remaining on their surface. During heat treatment, these oil stains evaporate and migrate to the conveyor belt rollers, affecting the braking of the clamp-type rollers. In this invention, a braking compensation component is added. When the tension sensor sends a signal, the hydraulic cylinder 5 of the roller braking module starts to respond and drives the brake plate 51 to move, so that the brake plate 51 passes through the relief groove 52 and reaches the gap after the roller 27 is expanded, thereby compensating for the braking of the rotating shaft 21 and improving the braking effect. Furthermore, after the rollers rotate, the conveyor belt still has inertia and may still move and throw out. After being heated by high temperature, it poses a safety hazard. In this invention, when the brake plate 51 moves, it will drive the limiting plate 53 to move, so that the limiting plate 53 disengages from the second mounting plate 56 and releases the limitation on the second mounting plate 56. At this time, under the elastic force of the third spring 55, the second mounting plate 56 will drive the brake pin 57 to move downward, thereby inserting it into the gap of the conveyor belt 11 to achieve braking on the lower side of the conveyor belt 11. When the second mounting plate 56 moves downward, it will pull the connecting pin 511, so that the connecting pin 511 pulls down one end of the pressure plate 59, thereby causing the other end of the pressure plate 59 to tilt upward, thereby driving the support plate 48 to squeeze the conveyor belt 11. With the cooperation of the pressure roller 3, the upper side of the conveyor belt 11 is clamped to achieve the purpose of braking. The third spring 55 is also provided with a through groove 510 to provide movement space for the pressure plate 59.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces, comprising a furnace body (1), a mesh belt (11), a chain (12), and a disassembly and assembly roller assembly for driving the chain (12), characterized in that: It also includes a pressure roller assembly, which includes a pressure roller (3) fixedly mounted on the furnace body (1) and a cleaning slot (31) opened at the bottom of the pressure roller (3). When the mesh belt (11) is installed, the disassembly roller assembly will cause one end of the mesh belt (11) to tilt toward the cleaning slot (31). When the mesh belt (11) moves, the cleaning slot (31) passively cleans the impurities on the surface of the mesh belt (11). When the mesh belt (11) passes the pressure roller (3), it will be tilted and corrected by the pressure roller (3) to improve the conveying stability. The disassembly roller assembly includes a drive module and an extension module. The drive module includes a pressure roller (3) fixedly mounted on the furnace body (1) and a cleaning slot (31) opened at the bottom of the pressure roller (3). 1) A servo motor (2) on one side and a rotating shaft (21) fixedly connected to the output shaft of the servo motor (2). Both ends of the rotating shaft (21) are fixedly mounted with sprockets (22). The sprockets (22) mesh with the chain (12). The expansion module includes slip rings (24) movably mounted on both sides of the rotating shaft (21). A dual-axis electric push rod (23) is provided inside the rotating shaft (21). The output shaft of the dual-axis electric push rod (23) is fixedly connected to the slip ring (24). A support rod (26) is hinged to the outer periphery of the slip ring (24). A roller (27) is hinged to the other end of the support rod (26).

2. The continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces according to claim 1, characterized in that: It also includes a cleaning module, which includes an auger (35) movably installed inside the pressure roller (3), one end of which passes through the pressure roller (3) and extends to the outside of the pressure roller (3), and a drive mechanism is fixedly installed thereon.

3. The continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces according to claim 1, characterized in that: It also includes a support assembly, which includes a support frame (4) disposed inside the furnace body (1) and a first spring (41) fixedly connected to the support frame (4). The other end of the first spring (41) is fixedly connected to an arc plate (42). A wedge block (46) is disposed on one side of the arc plate (42). A second spring (47) is fixedly connected to the upper surface of the wedge block (46). The other end of the second spring (47) is fixedly connected to a support plate (48).

4. A continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces according to claim 3, characterized in that: It also includes a braking compensation component, which includes a roller braking module, a lower mesh belt braking module and an upper mesh belt braking module. The roller braking module includes a hydraulic cylinder (5) fixedly installed on the bearing frame (4) and a brake plate (51) fixedly connected to the output shaft of the hydraulic cylinder (5). The arc plate (42) is provided with a clearance groove (52).

5. A continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces according to claim 4, characterized in that: The lower mesh belt braking module includes a first mounting plate (54) fixedly installed on the bearing frame (4), and a third spring (55) fixedly connected to the bottom of the hydraulic cylinder (5). The bottom of the third spring (55) is fixedly connected to a second mounting plate (56). The bottom of the second mounting plate (56) is fixedly installed with a brake column (57). Limiting plates (53) are fixedly installed on both sides of the brake plate (51), and the limiting plates (53) are located below the second mounting plate (56).

6. A continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces according to claim 5, characterized in that: The mesh belt braking module includes a mounting component (58) fixedly installed on the upper surface of the first mounting plate (54), and a pressure plate (59) movably installed with the mounting component (58). One end of the pressure plate (59) is located below the support plate (48), and the other end is movably installed with a connecting column (511). The bottom of the connecting column (511) is movably installed with the second mounting plate (56).

7. A continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces according to claim 3, characterized in that: A first T-shaped slider (43) is fixedly installed on one side of the arc plate (42), and a T-shaped groove adapted to the first T-shaped slider (43) is provided on the bearing frame (4).

8. A continuous high-temperature mesh belt furnace for heat treatment of high-strength stainless steel workpieces according to claim 3, characterized in that: A second T-shaped slider (45) is fixedly installed on one side of the wedge block (46), and a slide rail (44) is movably installed on the outer surface of the second T-shaped slider (45). The slide rail (44) is fixedly connected to the support frame (4).

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