Novel cooling and temperature-returning guide groove structure easy to replace

Abstract

The utility model discloses a novel cooling and temperature-returning guide groove structure easy to replace. The novel cooling and temperature-returning guide groove structure comprises a cross beam, a lower guide groove, an upper guide groove, a wear-resisting block and a locking assembly. The cross beam is horizontally and transversely arranged, a plurality of horizontally and transversely arranged lower guide grooves are sequentially formed in the upper surface of the cross beam from left to right in an aligned mode, and it is ensured that the opening ends of the lower guide grooves are arranged upwards; an upper guide groove is horizontally and transversely formed in each lower guide groove in an aligned mode, the internal cross section of each upper guide groove and the internal cross section of each lower guide groove are semi-ellipses of the same size, and each upper guide groove and the corresponding lower guide groove are oppositely arranged up and down and are locked and fixed through a locking assembly. Further, a plurality of sections of guide groove structures which are horizontally and transversely aligned and attached are spliced; square holes are formed in the inner bottom face of each lower guide groove in a left-right spaced mode, and each wear-resisting block is inserted into the corresponding square hole in a clearance fit mode. The wear resistance of the guide groove is improved, the service life of the guide groove is prolonged, and the replacement cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bar production, in particular to a novel easily replaceable cooling and temperature-returning guide groove structure. Background Art

[0002] During the high-bar production process in the steel rolling mill, the finishing rolling area generally uses loopers and pinch roll equipment to adjust the stacking and pulling relationship; at the same time, the rolling mill is equipped with a cooling water tank with high-pressure and high-flow cooling capacity to implement effective cooling control measures to ensure that the supercooling of the red steel meets the controlled rolling and cooling requirements of the production process, thereby achieving the production goals of refining the grains and enhancing the yield strength.

[0003] During the production process, red steel passes through a long cooling and reheating trough after passing through the cooling water tank, which helps even out the internal and external temperatures and grain size of the steel. However, the existing cooling and reheating trough is too long, prone to wear and deformation. Replacement is time-consuming and expensive. Furthermore, if steel is trapped in the cooling and reheating trough during a steel jam, there is a risk of steel leakage, making it difficult to address and compromising on-site safety. Therefore, these issues urgently need to be addressed. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a new and easily replaceable cooling and temperature return guide groove structure. By using a square hole and a wear-resistant block in combination, it not only facilitates the quick disassembly of the wear-resistant block, but also improves the wear resistance of the guide groove, increases the service life of the guide groove, and reduces the replacement cost.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: the utility model is a new type of easily replaceable cooling and temperature return guide groove structure, the innovation of which is that it includes a cross beam, a lower guide groove, an upper guide groove, a wear-resistant block and a locking assembly; the cross beam is horizontally arranged, and a plurality of horizontally arranged lower guide grooves are aligned and fixed on its upper surface from left to right, and ensure that the opening end of each of the lower guide grooves is set upward; each of the lower guide grooves is also horizontally and horizontally aligned with a matching upper guide groove, the internal cross-section of each of the upper guide grooves and the lower guide grooves is semi-elliptical in size, and each of the upper guide grooves is respectively arranged relative to the corresponding lower guide groove up and down, and is locked and fixed by a locking assembly, thereby splicing into multiple sections of horizontally and horizontally aligned and fitted guide groove structures; square holes matching the wear-resistant blocks are also vertically embedded at intervals on the inner bottom surface of each of the lower guide grooves, and each of the wear-resistant blocks is respectively inserted into the corresponding square hole of each of the lower guide grooves with a clearance fit, thereby increasing the wear resistance of the corresponding guide groove structure.

[0006] Preferably, a plurality of support legs are vertically provided on the lower surface of the beam at intervals along its length direction, and each of the support legs is arranged at a position of the beam that is susceptible to thermal deformation, and supports the beam through the support legs.

[0007] Preferably, it also includes a fixing plate; fixing plates are symmetrically arranged on the left and right outer bottom surfaces of each of the lower guide grooves, each of the fixing plates is arranged horizontally and longitudinally, and the middle position of its upper surface is welded and fixed to the outer bottom surface of the corresponding lower guide groove; the longitudinal length of each of the fixing plates matches the longitudinal width of the crossbeam, and its front and rear ends respectively extend out of the vertical plane where the front and rear end surfaces of the corresponding lower guide groove are located, and then each of the lower guide grooves is fixed on the crossbeam by screwing the fixing plate and the crossbeam.

[0008] Preferably, the inner semi-ellipse of each upper guide groove and lower guide groove is arranged longitudinally, and the long diameter of the semi-ellipse needs to match the width of the red steel, thereby expanding the internal cavity of the guide groove structure and ensuring that there is no interference with the movement of the red steel passing through the guide groove structure.

[0009] Preferably, an inclined transition section I is provided in the outer direction at the left end inside each of the upper guide grooves, and an inclined transition section II is provided in the outer direction at the left end inside each of the lower guide grooves. After the upper guide groove is spliced ​​with the corresponding lower guide groove, the feed end of each guide groove structure is made trumpet-shaped through the cooperation of the inclined transition section I and the inclined transition section II.

[0010] Preferably, the square holes on the left side of each lower guide groove are arranged at a position 10 mm to the right of the corresponding inclined transition section II, and the square holes on the right side of each lower guide groove are arranged at a position 400 mm to the right of the corresponding inclined transition section II; each of the square holes is arranged at the straight section of the inner bottom surface of the corresponding lower guide groove, thereby ensuring that after the wear-resistant block is inserted into the corresponding square hole, the inner bottom surface of the lower guide groove can be protected by the wear-resistant block.

[0011] Preferably, each of the wear-resistant blocks is a rectangular structure that matches the square hole, and is horizontally and laterally embedded in the corresponding square hole; an arc groove is also embedded in the upper surface of each wear-resistant block, and it is ensured that the arc groove is coaxially arranged with the semi-elliptical shape of the corresponding lower guide groove; the height of each wear-resistant block needs to ensure that after it is inserted into the corresponding square hole, the distance between the upper surface of the wear-resistant block and the bottom surface of the corresponding lower guide groove is 1~3mm; a rounded corner is also provided on the left end face of each wear-resistant block near its upper end, thereby ensuring the smooth passage of red steel through the rounded corner.

[0012] Preferably, a positioning pin I is vertically provided on the left side of the upper surface of each of the lower guide grooves, and each of the positioning pins I is arranged at a position corresponding to the front edge of the lower guide groove; a positioning pin II is vertically provided on the right side of the upper surface of each of the lower guide grooves, and each of the positioning pins II is arranged at a position corresponding to the rear edge of the lower guide groove; a socket I matching the positioning pin I is vertically embedded in the lower surface of each of the upper guide grooves relative to the position of the positioning pin I, and a socket II matching the positioning pin II is vertically embedded in the lower surface of each of the upper guide grooves relative to the position of the positioning pin II, and then the upper guide groove and the corresponding lower guide groove are positioned by the cooperation between the socket I and the positioning pin I, and the cooperation between the socket II and the positioning pin II; the distance between each of the positioning pins I and the left end face of the corresponding lower guide groove is inconsistent with the distance between each of the positioning pins II and the right end face of the corresponding lower guide groove, thereby playing a role in preventing wrong insertion when the upper guide groove and the corresponding lower guide groove are docked.

[0013] Preferably, each of the locking assemblies comprises a support, a handle, a rotating shaft and a clamping plate; a support is fixedly provided on the front side surface of each of the lower guide slots relative to the position between the corresponding two fixed plates, and a rotating shaft is also horizontally provided on the right side surface of each of the supports, and the left end of each of the rotating shafts extends vertically out of the left side surface of the corresponding support and is respectively connected to the corresponding support for rotation around its own axial direction; each of the handles is vertically and longitudinally arranged, and its lower end is respectively coaxially sleeved and fixed on the corresponding rotating shaft relative to the right side of the corresponding support, and it is necessary to ensure that the fixed plate does not interfere with the vertical rotation of the handle with the rotating shaft; the front side surface of each of the upper guide slots is relative to each support The seat position is also fixed with a card plate horizontally, and a card slot matching the handle is vertically embedded in the front surface of each card plate relative to each handle position, and ensure that each card slot passes through the upper and lower surfaces of the corresponding card plate, and then the handle is flipped upward and engaged in the card slot of the corresponding card plate, locking and fixing the upper guide groove and the corresponding lower guide groove; bosses are also integrally formed on the left and right end surfaces of each handle, and each boss does not interfere with the engaging action of the handle and the corresponding card plate, and its setting position needs to ensure that when the handle is engaged with the corresponding card plate, the boss is located above the corresponding card slot, thereby ensuring the stability of the engaging state of the handle and the corresponding card plate.

[0014] Beneficial effects of the utility model:

[0015] (1) The utility model uses a square hole and a wear-resistant block in combination, which not only facilitates the quick disassembly of the wear-resistant block, but also improves the wear resistance of the guide groove, increases the service life of the guide groove, and reduces the replacement cost;

[0016] (2) The utility model provides the lower guide groove with multiple sections, which reduces the length of the lower guide groove and thus reduces the risk of the lower guide groove being deformed by heat;

[0017] (3) The utility model uses the positioning pin I and the positioning pin II in combination, which not only facilitates the positioning of the upper guide groove and the lower guide groove, but also prevents the upper guide groove from being installed upside down, thereby reducing the risk of steel movement caused by installation errors;

[0018] (4) The utility model facilitates the quick locking and fixing of the upper guide groove and the lower guide groove by using the support, handle and clamping plate, thereby improving the efficiency of installation and disassembly;

[0019] (5) The utility model sets the inner wall of the upper guide groove and the lower guide groove to be elliptical, which expands the cavity and reduces the additional wear of the next frame caused by slight shaking of the biting steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a structural schematic diagram of a new type of easily replaceable cooling and temperature return guide groove structure of the utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the utility model when the upper guide groove and the wear-resistant block are not installed.

[0023] Figure 3 This is a schematic structural diagram of the wear-resistant block of the utility model.

[0024] Among them, 1-support leg; 2-crossbeam; 3-fixed plate; 4-lower guide groove; 5-square hole; 6-wear-resistant block; 7-locating pin I; 8-support; 9-handle; 10-upper guide groove; 11-clamp; 12-locating pin II. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below through specific implementation methods.

[0026] The utility model is a new type of easily replaceable cooling and temperature return guide groove structure, comprising a crossbeam 2, a lower guide groove 4, an upper guide groove 10, a wear-resistant block 6 and a locking assembly; the specific structure is as follows Figures 1-3As shown, the crossbeam 2 is arranged horizontally and transversely, and on its upper surface are also fixedly provided with several horizontally and transversely arranged lower guide grooves 4 in sequence from left to right, and ensure that the open end of each lower guide groove 4 is arranged upward; on each lower guide groove 4, there are also upper guide grooves 10 that match it aligned horizontally and transversely, and the internal cross-sections of each upper guide groove 10 and lower guide groove 4 are semi-elliptical in size, and each upper guide groove 10 is respectively arranged relative to the corresponding lower guide groove 4 up and down, and is locked and fixed by a locking assembly, and then spliced ​​into multiple sections of horizontally and transversely aligned and fitted guide groove structures; on the inner bottom surface of each lower guide groove 4, there are also square holes 5 that match the wear-resistant blocks 6 that are vertically embedded at intervals on the left and right, and each wear-resistant block 6 is respectively inserted into the corresponding square hole 5 of each lower guide groove 4 with a clearance fit, thereby increasing the wear resistance of the corresponding guide groove structure.

[0027] like Figure 1 、 Figure 2 As shown, a plurality of support legs 1 are vertically arranged at intervals along the length direction of the lower surface of the beam 2, and each support leg 1 is arranged at a position of the beam 2 that is susceptible to heat deformation, and supports the beam 2 through the support leg 1.

[0028] like Figure 1 、 Figure 2 As shown, fixed plates 3 are symmetrically spaced on the left and right sides of the outer bottom surface of each lower guide groove 4, and each fixed plate 3 is arranged horizontally and longitudinally, and the middle position of its upper surface is welded and fixed to the outer bottom surface of the corresponding lower guide groove 4; the longitudinal length of each fixed plate 3 matches the longitudinal width of the crossbeam 2, and its front and rear ends respectively extend out of the vertical plane where the front and rear end surfaces of the corresponding lower guide groove 4 are located, and then each lower guide groove 4 is fixedly installed on the crossbeam 2 by screwing the fixed plate 3 and the crossbeam 2.

[0029] The inner semi-ellipse of each upper guide groove 10 and lower guide groove 4 of the present invention is arranged longitudinally, and the long diameter of the semi-ellipse must match the width of the red steel, thereby expanding the internal cavity of the guide groove structure and ensuring that the red steel does not interfere with the movement of the guide groove structure; Figure 1 、 Figure 2 As shown, an inclined transition section I is provided in the outer direction on the left end inside each upper guide groove 10, and an inclined transition section II is provided in the outer direction on the left end inside each lower guide groove 4. After the upper guide groove 10 is spliced ​​with the corresponding lower guide groove 4, the feed end of each guide groove structure is made into a trumpet shape through the cooperation of the inclined transition section I and the inclined transition section II.

[0030] like Figure 1 、 Figure 2As shown, the left side square hole 5 on each lower guide groove 4 is arranged at a position 10 mm to the right of the corresponding inclined transition section II, and the right side square hole 5 on each lower guide groove 4 is arranged at a position 400 mm to the right of the corresponding inclined transition section II; each square hole 5 is arranged at the straight section of the inner bottom surface of the corresponding lower guide groove 4, thereby ensuring that after the wear-resistant block 6 is inserted into the corresponding square hole 5, the wear-resistant block 6 can protect the inner bottom surface of the lower guide groove 4.

[0031] like Figures 1-3 As shown, each wear-resistant block 6 is a rectangular structure that matches the square hole 5, and is horizontally and laterally embedded in the corresponding square hole 5; an arc groove is also embedded in the upper surface of each wear-resistant block 6, and it is ensured that the arc groove is coaxially arranged with the semi-elliptical shape of the corresponding lower guide groove 4; the height of each wear-resistant block 6 needs to ensure that after it is inserted into the corresponding square hole 5, the distance between the upper surface of the wear-resistant block 6 and the inner bottom surface of the corresponding lower guide groove 4 is 1~3mm; a rounded corner is also provided on the left end face of each wear-resistant block 6 near its upper end, thereby ensuring the smooth passage of red steel through the rounded corner.

[0032] The utility model is also provided with a positioning pin Ⅰ 7 vertically on the left side of the upper surface of each lower guide groove 4, and each positioning pin Ⅰ 7 is arranged at a position corresponding to the front edge of the lower guide groove 4; Figure 1 、 Figure 2 As shown, a positioning pin II 12 is vertically provided on the right side of the upper surface of each lower guide groove 4, and each positioning pin II 12 is arranged at the rear edge position of the corresponding lower guide groove 4; a socket I matching the positioning pin I7 is vertically embedded on the lower surface of each upper guide groove 10 relative to the position of the positioning pin I7, and a socket II matching the positioning pin II 12 is vertically embedded on the lower surface of each upper guide groove 10 relative to the position of the positioning pin II 12, thereby positioning the upper guide groove 10 and the corresponding lower guide groove 4 through the cooperation between the socket I and the positioning pin I7, and the cooperation between the socket II and the positioning pin II 12; wherein, the distance between each positioning pin I7 and the left end face of the corresponding lower guide groove 4 is inconsistent with the distance between each positioning pin II 12 and the right end face of the corresponding lower guide groove 4, thereby playing a role in preventing wrong insertion when the upper guide groove 10 and the corresponding lower guide groove 4 are docked.

[0033] Each locking assembly of the present invention includes a support 8, a handle 9, a rotating shaft and a clamping plate 11; Figure 1 、 Figure 2As shown, a support 8 is fixedly provided on the front side surface of each lower guide groove 4 relative to the position between the corresponding two fixed plates 3, and a rotating shaft is also horizontally and transversely provided on the right side surface of each support 8, and the left end of each rotating shaft extends vertically out of the left side surface of the corresponding support 8, and is respectively connected to the corresponding support 8 for rotation around its own axial direction; each handle 9 is vertically and longitudinally arranged, and its lower end is respectively coaxially sleeved and fixed on the corresponding rotating shaft relative to the right side of the corresponding support 8, and it is necessary to ensure that the fixed plate 3 does not interfere with the vertical rotation of the handle 9 with the rotating shaft; a clamping plate 11 is also fixed horizontally and transversely on the front side surface of each upper guide groove 10 relative to the position of each support 8, and at each The front surface of a card plate 11 is vertically embedded with a card slot matching the handle 9 relative to the position of each handle 9, and ensures that each card slot passes through the upper and lower surfaces of the corresponding card plate 11, and then the handle 9 is flipped upward and engaged in the card slot of the corresponding card plate 11, locking and fixing the upper guide groove 10 and the corresponding lower guide groove 4; bosses are also integrally formed on the left and right end faces of each handle 9, and each boss does not interfere with the engaging action of the handle 9 and the corresponding card plate 11, and its setting position needs to ensure that when the handle 9 is engaged with the corresponding card plate 11, the boss is located above the corresponding card slot, thereby ensuring the stability of the engaging state of the handle 9 and the corresponding card plate 11.

[0034] The working principle of the utility model is: when the wear-resistant block 6 is severely worn and needs to be replaced, flip the handle 9 at the corresponding position downward, and then remove the corresponding upper guide groove 10, so that the wear-resistant block 6 can be replaced, and ensure that the rounded corner of the wear-resistant block 6 is set to the left;

[0035] Then, through the cooperation between the socket I and the positioning pin I7, and the cooperation between the socket II and the positioning pin II 12, the removed upper guide groove 10 and the corresponding lower guide groove 4 are positioned and spliced; then the corresponding handle 9 is flipped upward so that the handle 9 is clamped in the clamping groove of the corresponding clamping plate 11, and the upper guide groove 10 and the corresponding lower guide groove 4 can be locked and fixed.

[0036] Beneficial effects of the utility model:

[0037] (1) The utility model uses the square hole 5 and the wear-resistant block 6 in combination, which not only facilitates the quick disassembly of the wear-resistant block 6, but also improves the wear resistance of the guide groove, increases the service life of the guide groove, and reduces the replacement cost;

[0038] (2) The present invention provides the lower guide groove 4 with multiple sections, which reduces the length of the lower guide groove 4 and thus reduces the risk of the lower guide groove 4 being deformed by heat;

[0039] (3) The present invention uses the positioning pin I7 and the positioning pin II12 in conjunction with each other, which not only facilitates the positioning of the upper guide groove 10 and the lower guide groove 4, but also prevents the upper guide groove 10 from being installed upside down, thereby reducing the risk of steel movement caused by installation errors;

[0040] (4) The utility model facilitates the quick locking and fixing of the upper guide groove 10 and the lower guide groove 4 by using the support 8, the handle 9 and the clamping plate 11, thereby improving the efficiency of installation and disassembly;

[0041] (5) The utility model sets the inner wall of the upper guide groove 10 and the lower guide groove 4 to be elliptical, which expands the cavity and reduces the additional wear of the next frame caused by slight shaking of the biting steel.

[0042] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary engineering technicians in this field should fall within the scope of protection of the present invention. The technical contents requested for protection of the present invention have been fully recorded in the technical requirements.

Claims

1. A new and easy-to-replace cooling and temperature return guide groove structure, characterized by: The cam is fixed with a plurality of guide grooves, and the guide grooves are fixed with a plurality of guide grooves, and the guide grooves are fixed with a plurality of guide grooves.

2. The novel easily replaceable cooling and temperature return guide groove structure according to claim 1, characterized in that: A plurality of support legs are vertically arranged at intervals on the lower surface of the beam along its length direction, and each support leg is arranged at a position of the beam that is susceptible to thermal deformation, and supports the beam through the support legs.

3. The novel easily replaceable cooling and temperature return guide groove structure according to claim 1, characterized in that: It also includes a fixing plate; fixing plates are symmetrically arranged on the left and right sides of the outer bottom surface of each lower guide groove, each of the fixing plates is arranged horizontally and longitudinally, and the middle position of its upper surface is welded and fixed to the outer bottom surface of the corresponding lower guide groove; the longitudinal length of each fixing plate matches the longitudinal width of the crossbeam, and its front and rear ends respectively extend out of the vertical plane where the front and rear end surfaces of the corresponding lower guide groove are located, and then each lower guide groove is fixed on the crossbeam by screwing the fixing plate and the crossbeam.

4. The novel easily replaceable cooling and temperature return guide groove structure according to claim 1, characterized in that: The inner semi-ellipse of each upper guide groove and lower guide groove is arranged longitudinally, and the long diameter of the semi-ellipse needs to match the width of the red steel, thereby expanding the internal cavity of the guide groove structure and ensuring that there is no interference with the movement of the red steel passing through the guide groove structure.

5. The novel easily replaceable cooling and temperature return guide groove structure according to claim 4, characterized in that: An inclined transition section I is provided in the outer direction toward the left end of each upper guide groove, and an inclined transition section II is provided in the outer direction toward the left end of each lower guide groove. After the upper guide groove is spliced ​​with the corresponding lower guide groove, the feed end of each guide groove structure is made trumpet-shaped through the cooperation of the inclined transition section I and the inclined transition section II.

6. The novel easily replaceable cooling and temperature return guide groove structure according to claim 5, characterized in that: The square holes on the left side of each lower guide groove are arranged at a position 10mm to the right of the corresponding inclined transition section II, and the square holes on the right side of each lower guide groove are arranged at a position 400mm to the right of the corresponding inclined transition section II; each of the square holes is arranged at the straight section of the inner bottom surface of the corresponding lower guide groove, thereby ensuring that after the wear-resistant block is inserted into the corresponding square hole, the inner bottom surface of the lower guide groove can be protected by the wear-resistant block.

7. The novel easily replaceable cooling and temperature return guide groove structure according to claim 6, characterized in that: Each of the wear-resistant blocks is a rectangular structure that matches the square hole, and is horizontally embedded and inserted in the corresponding square hole; an arc groove is also embedded in the upper surface of each wear-resistant block, and it is ensured that the arc groove is coaxial with the semi-elliptical shape of the corresponding lower guide groove; the height of each wear-resistant block needs to ensure that after it is inserted into the corresponding square hole, the distance between the upper surface of the wear-resistant block and the bottom surface of the corresponding lower guide groove is 1~3mm; a rounded corner is also provided on the left end face of each wear-resistant block near its upper end, thereby ensuring the smooth passage of red steel through the rounded corner.

8. The novel easily replaceable cooling and temperature return guide groove structure according to claim 1, characterized in that: A positioning pin I is vertically provided on the left side of the upper surface of each of the lower guide grooves, and each of the positioning pins I is arranged at a position corresponding to the front edge of the lower guide groove; a positioning pin II is vertically provided on the right side of the upper surface of each of the lower guide grooves, and each of the positioning pins II is arranged at a position corresponding to the rear edge of the lower guide groove; a socket I matching the positioning pin I is vertically embedded in the lower surface of each of the upper guide grooves relative to the position of the positioning pin I, and a socket II matching the positioning pin II is vertically embedded in the lower surface of each of the upper guide grooves relative to the position of the positioning pin II, and then the upper guide groove and the corresponding lower guide groove are positioned by the cooperation between the socket I and the positioning pin I, and the cooperation between the socket II and the positioning pin II; the distance between each of the positioning pins I and the left end face of the corresponding lower guide groove is inconsistent with the distance between each of the positioning pins II and the right end face of the corresponding lower guide groove, thereby playing a role in preventing wrong insertion when the upper guide groove and the corresponding lower guide groove are docked.

9. The novel easily replaceable cooling and temperature return guide groove structure according to claim 3, characterized in that: Each of the locking assemblies comprises a support, a handle, a rotating shaft and a clamping plate; a support is fixedly provided on the front side surface of each of the lower guide slots relative to the position between the corresponding two fixed plates, and a rotating shaft is also horizontally provided on the right side surface of each of the supports, and the left end of each rotating shaft extends vertically out of the left side surface of the corresponding support and is respectively connected to the corresponding support for rotation around its own axis; each of the handles is vertically and longitudinally arranged, and its lower end is respectively coaxially sleeved and fixed on the corresponding rotating shaft relative to the right side of the corresponding support, and it is necessary to ensure that the fixed plate does not interfere with the vertical rotation of the handle with the rotating shaft; the front side surface of each of the upper guide slots is relative to each support seat A card plate is also fixed horizontally, and a card slot matching the handle is vertically embedded in the front surface of each card plate relative to each handle position, and ensure that each card slot passes through the upper and lower surfaces of the corresponding card plate, and then the handle is flipped upward and engaged in the card slot of the corresponding card plate, locking and fixing the upper guide groove and the corresponding lower guide groove; bosses are also integrally formed on the left and right end surfaces of each handle, and each boss does not interfere with the engaging action of the handle and the corresponding card plate, and its setting position needs to ensure that when the handle is engaged with the corresponding card plate, the boss is located above the corresponding slot, thereby ensuring the stability of the engaging state of the handle and the corresponding card plate.

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