An electromechanical-hydraulic intelligent composite finishing mill work roll locking device

Abstract

This invention relates to the field of rolling mill technology, specifically disclosing an electromechanical-hydraulic intelligent composite finishing mill work roll locking device. The device includes two rolls, two support frames, and multiple displacement sensors. Supports are provided at both ends of the two rolls, and a locking mechanism is connected to each roll via the support frames. The locking mechanism is used to install and support the rolls, simultaneously locking them axially and radially to reduce mechanical wear on the roll shaft components. Notches are provided on one side of each support frame, and adjustment mechanisms are installed in these notches. These adjustment mechanisms cooperate with the locking mechanism to adjust the distance between the two rolls, and the adjustment mechanism limits the movement distance of the two rolls to be the same. The electromechanical-hydraulic intelligent composite finishing mill work roll locking device designed in this invention can stably lock the rolling mill work rolls and limit the radial and axial forces on the roll bearings, reducing the workload of the roll bearings. It also provides sufficient lubrication to the roll bearings, reducing mechanical wear.

Description

Technical Field

[0001] This invention relates to the field of rolling equipment technology, and specifically to an electromechanical-hydraulic intelligent composite finishing rolling work roll locking device. Background Technology

[0002] Rolling mills generally refer to equipment that completes the entire process of rolling production. Rolling mills can be divided into twin-roll and multi-roll rolling mills according to the number of rolls. A rolling mill is mainly composed of rolls, frame, roll gap adjustment device, roll temperature adjustment device, transmission device, lubrication system, control system and roll removal device. In addition to the main components and devices of ordinary rolling mills, precision rolling mills have added electro-hydraulic intelligent control devices to ensure rolling accuracy.

[0003] Although electro-hydraulic intelligent control devices can control the roll spacing and monitor its changes, the rolling mill bearings are subject to heavy and variable working loads. Therefore, the bearings are required to have a low coefficient of friction, sufficient strength and rigidity, and ease of roll replacement. Rolling mills commonly use cylindrical roller bearings or rolling bearings. Cylindrical roller bearings have high rigidity, a low coefficient of friction, can withstand high pressure, and are easy to disassemble, but they are relatively expensive. Therefore, rolling bearings are mostly used for the work rolls of strip mills.

[0004] Currently, due to the heavy workload of the rolling mill roll bearings, the radial and axial pressures cause severe mechanical wear, making it difficult for the roll pitch adjustment device to accurately adjust the roll pitch. This results in large roll pitch errors, making it impossible to produce rolled materials of standard thickness. Furthermore, insufficient lubrication of the roll bearings also accelerates the mechanical wear of the rolling mill. Therefore, it is necessary to design an electromechanical-hydraulic intelligent composite finishing mill work roll locking device to address the problems of the existing rolling mill roll bearings' heavy workload, severe mechanical wear caused by radial and axial pressures, difficulty in accurately adjusting the roll pitch by the roll pitch adjustment device, large roll pitch errors, inability to produce rolled materials of standard thickness, and insufficient lubrication of the roll bearings accelerating mechanical wear of the rolling mill. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide an electromechanical-hydraulic intelligent composite finishing mill work roll locking device.

[0006] The technical solution adopted by the present invention to solve its technical problem is: an electromechanical-hydraulic intelligent composite precision rolling work roll locking device, including two rolls, two support frames and multiple displacement sensors. Both ends of the two rolls are provided with support parts. The rolls are connected to a locking mechanism through the support parts. The locking mechanism is used to install the support rolls and lock the rolls simultaneously in the axial and radial directions, thereby reducing the mechanical wear of the roll shaft system components.

[0007] Both of the support frames have a notch on one side, and an adjustment mechanism is installed in the notch. The adjustment mechanism works with the locking mechanism to adjust the distance between the two rolls, and the adjustment mechanism limits the two rolls to move the same distance.

[0008] Two symmetrically arranged support arms are rotatably connected within the notch via a rotating shaft. Each support arm has an installation port, and a sleeve is connected to the installation port. The locking mechanism is installed inside the sleeve, and the opposite side of the two support arms is connected to an adjustment mechanism.

[0009] Preferably, the locking mechanism includes a housing, which is fitted onto one end of a sleeve. The displacement sensor is fixed to one side of the housing. A flange is fixedly connected to the side wall of the housing. The flange is fixedly connected to the end of the sleeve by a first bolt. An annular plate is fitted onto the support portion. The side wall of the annular plate is fixedly connected to the other end of the sleeve by a second bolt. A double-row deep groove ball bearing is interference-fitted inside the sleeve. A bushing is interference-fitted to the inner ring of the bearing. The support portion passes through the annular plate and is interference-fitted to the inner side of the bushing. One end of the sleeve passes through the bushing and has an inclined surface. A top block is fitted inside the outer shell. A truncated cone-shaped groove is formed on one side of the top block. Multiple mounting grooves are evenly formed on the inclined surface of the groove, and rollers are provided in the mounting grooves. The rollers are in contact with the inclined surface. Multiple evenly distributed oil passages are formed on the side wall of the top block, and the oil passages are connected to the mounting grooves. A hydraulic cylinder is fixedly connected inside the outer shell. The output end of the hydraulic cylinder is fixedly connected to one side of the top block. A fixing ring is fixedly connected to the tube wall of the sleeve. The side wall of the fixing ring is fixedly connected to the side wall of the support arm by a third bolt.

[0010] Preferably, one end of the bushing is provided with a first rolled edge portion, the support portion is sleeved with a ring, the edge of the ring is provided with a second rolled edge portion, the second rolled edge portion is sleeved with the edge of the first rolled edge portion, both sides of the ring are provided with annular protrusions, the annular plate is provided with annular grooves on the side opposite to the first rolled edge portion, the two annular grooves are respectively engaged with the two annular protrusions, the side wall of the bushing is evenly provided with multiple oil return channels, the end of the bushing away from the first rolled edge portion passes through the inner ring of the bearing and is sleeved with a retaining ring, the inner side of the retaining ring is fixedly connected with multiple rectangular blocks, the multiple rectangular blocks are respectively engaged with multiple oil return channels, the inner side of the retaining ring is provided with a limiting portion, the side wall of the retaining ring is evenly fixedly connected with multiple inclined plates, the sleeve wall is provided with an oil injection hole, and a sealing plug is connected in the oil injection hole.

[0011] Preferably, the top block has a first chamfer with an annular structure at its corner, a backstop ring is fixedly connected inside the outer shell, and a second chamfer is provided at the corner of the backstop ring, which cooperates with the first chamfer. A frustum is fixedly connected to the side of the groove away from the opening, and a positioning hole that cooperates with the frustum is provided at the center of one end of the support.

[0012] Preferably, the adjustment mechanism includes a double-rod hydraulic cylinder, both ends of which are rotatably connected to two support arms via pins. Displacement sensors are installed on both the upper and lower sides of the double-rod hydraulic cylinder to collect the displacement of the upper and lower telescopic rods of the double-rod hydraulic cylinder. The support frame is provided with two limiting rods, and bushings are fixedly connected to the opposite ends of the two limiting rods. A support shaft is rotatably connected to both bushings. One end of the limiting rod is rotatably connected to the side wall of the support arm via a connecting shaft.

[0013] Preferably, two support rods are fixedly connected to the inner side of the support frame, and a rectangular frame is fixedly connected to the upper end of each of the two support rods. One end of the rectangular frame is fixedly connected to the side wall of the support frame, and the inner side of the rectangular frame is sleeved with the shaft wall of the support shaft.

[0014] The present invention has the following beneficial effects:

[0015] 1. In use, the rolls are mounted on the support arms. The distance between the two rolls can be adjusted by the adjustment mechanism on the two support arms. The adjustment distance can be measured by the displacement sensor. The rolls and support arms are connected by a locking mechanism. The locking mechanism locks the rolls in both the axial and radial directions, reducing mechanical wear of the roll shaft components. The locking mechanism is installed inside the sleeve, which is fixed to the support arm by a third bolt. Therefore, it is convenient to replace the rolls and disassemble the sleeve to separate the rolls from the support arms.

[0016] 2. The locking mechanism provided in this invention allows the hydraulic cylinder to push the top block during use, causing the roller to contact the inclined surface on the connecting part. Due to the inclined arrangement of the roller, the radial and axial displacement of the roll can be limited, thus fixing the position of the roll. Furthermore, the extension and retraction distance of the hydraulic cylinder can offset the gap caused by roller wear, thereby reducing the working load of the bearing. A bushing is sleeved between the support part and the bearing, and a retaining ring is provided on the bushing. Since the retaining ring is connected to the oil return channel on the bushing through the rectangular block and the limiting part, there is a pressure difference on both sides of the bearing when the roll rotates, under the action of the inclined plate. Therefore, the lubricating oil flows back through the oil return channel on the bushing, thus fully lubricating the roller of the bearing. In addition, the oil passage provided on the top block allows the lubricating oil to enter the mounting groove to lubricate the roller.

[0017] 3. The adjustment mechanism provided in this invention allows the double-outlet hydraulic cylinder to simultaneously act on the two support arms, causing them to swing. As the support arms swing, they pull the two limit rods to swing around the support shaft, and are positioned by the rectangular frame, the support shaft only undergoes lateral displacement. Therefore, the two support arms can swing synchronously at the same angle, which facilitates the adjustment of the distance between the two rolls. When the support arms swing to the maximum angle, it is convenient for technicians to replace the rolls. Attached Figure Description

[0018] Figure 1 A schematic diagram of the installation structure of the electromechanical-hydraulic intelligent composite precision rolling mill work roll locking device;

[0019] Figure 2 This is a cross-sectional view of the installation of the locking mechanism in the electromechanical-hydraulic intelligent composite finishing mill work roll locking device;

[0020] Figure 3 This is a disassembly diagram of the locking mechanism in the electromechanical-hydraulic intelligent composite finishing mill work roll locking device;

[0021] Figure 4 for Figure 2 Schematic diagram of the central bushing, ring, and retaining ring;

[0022] Figure 5 for Figure 3 Schematic diagram of the structure of the middle clasp and the inclined side;

[0023] Figure 6 for Figure 3 A schematic diagram of the structure of the center block and rollers;

[0024] Figure 7 A schematic diagram of the adjusting mechanism in the electromechanical-hydraulic intelligent composite finishing mill work roll locking device;

[0025] Figure 8 This is a schematic diagram of the roll structure;

[0026] In the diagram: 1-Sleeve; 2-Support arm; 3-Support frame; 4-Support rod; 5-Displacement sensor; 6-Housing shell; 7-Roll; 8-Fixing ring; 9-Hydraulic cylinder; 10-Top block; 11-Anti-reverse ring; 12-Snap ring; 13-Bearing; 14-Annular plate; 15-Roller; 16-Frustum; 17-Circular ring; 18-First rolled edge; 19-Annular protrusion; 20-Annular groove; 21-Second rolled edge; 22-Shaft sleeve; 23-Flange; 24-Sloping plate; 25-Oil return channel; 26-Sloping surface; 27-Sealing plug; 28-Oil passage; 29-Double rod hydraulic cylinder; 30-Limit rod; 31-Bushing; 32-Rectangular frame; 33-Support shaft; 34-Rectangular block; 35-Limit part; 36-Support part. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example 1:

[0029] See attached document Figure 1-8 An electromechanical-hydraulic intelligent composite precision rolling mill roll locking device includes two rolls 7, two support frames 3, and multiple displacement sensors 5. Support portions 36 are provided at both ends of the two rolls 7. A locking mechanism is connected to the rolls 7 via the support portions 36. The locking mechanism is used to install and support the rolls 7 and simultaneously lock them axially and radially, reducing mechanical wear on the roll 7 shaft components. A notch is provided on one side of each of the two support frames 3, and an adjustment mechanism is installed in the notch. The adjustment mechanism cooperates with the locking mechanism to adjust the distance between the two rolls 7, and the adjustment mechanism limits the movement distance of the two rolls 7 to the same distance. Two symmetrically arranged support arms 2 are rotatably connected within the notch via a rotating shaft. Each support arm 2 has an installation port, and a sleeve 1 is connected to the installation port. The locking mechanism is installed inside the sleeve 1. The opposite sides of the two support arms 2 are connected to the adjustment mechanism.

[0030] In use, the roller 7 is mounted on the support arm 2. The distance between the two rollers 7 can be adjusted by the adjustment mechanism on the two support arms 2. The adjustment distance can be measured by the displacement sensor 5. The roller 7 and the support arm 2 are installed through a locking mechanism. The locking mechanism locks the roller 7 in both the axial and radial directions, reducing the mechanical wear of the roller 7 shaft components. The locking mechanism is installed in the sleeve 1. The sleeve 1 is fixed to the support arm 2 by the third bolt. Therefore, it is also convenient to replace the roller 7 and disassemble the sleeve 1 to separate the roller 7 from the support arm 2.

[0031] Example 2: The difference from Example 1 is that;

[0032] See attached document Figure 2-6The locking mechanism includes a housing 6, which is fitted onto one end of the sleeve 1. A displacement sensor 5 is fixed to one side of the housing 6. A flange 23 is fixedly connected to the side wall of the housing 6. The flange 23 is fixedly connected to the end of the sleeve 1 by a first bolt. An annular plate 14 is fitted onto the support part 36. The side wall of the annular plate 14 is fixedly connected to the other end of the sleeve 1 by a second bolt. A double-row deep groove ball bearing 13 is interference-fitted inside the sleeve 1. A bushing 22 is interference-fitted to the inner ring of the bearing 13. The support part 36 passes through the annular plate 14 and is interference-fitted to the inner side of the bushing 22. One side of the support part 36... The end passes through the bushing 22 and has an inclined surface 26. The top block 10 is sleeved inside the outer shell 6. A truncated cone-shaped groove is opened on one side of the top block 10. Multiple mounting grooves are evenly opened on the inclined surface of the groove, and a roller 15 is provided in the mounting groove. The roller 15 contacts the inclined surface 26. Multiple evenly distributed oil passages 28 are opened on the side wall of the top block 10, and the oil passages 28 are connected to the mounting grooves. A hydraulic cylinder 9 is fixedly connected inside the outer shell 6. The output end of the hydraulic cylinder 9 is fixedly connected to one side of the top block 10. A fixing ring 8 is fixedly connected to the tube wall of the sleeve 1. The side wall of the fixing ring 8 is fixedly connected to the side wall of the support arm 2 by a third bolt.

[0033] One end of the bushing 22 has a first rolled edge 18, and the support part 36 is fitted with a ring 17. The edge of the ring 17 has a second rolled edge 21, which fits into the edge of the first rolled edge 18. Both sides of the ring 17 have annular protrusions 19. The annular plate 14 has annular grooves 20 on the side opposite to the first rolled edge 18. The two annular grooves 20 engage with the two annular protrusions 19 respectively. The ring 17 is installed between the annular plate 14 and the bushing 22. The first rolled edge 18, the second rolled edge 21, the annular protrusions 19, and the annular grooves 20 seal the connection between the annular plate 14 and the support part 36. Multiple oil return channels 25 are evenly distributed on the sidewall of the bushing 22. The end of the bushing 22 away from the first rolled edge 18 passes through the bearing 13. The inner ring is fitted with a retaining ring 12, and multiple rectangular blocks 34 are fixedly connected to the inner side of the retaining ring 12. Each of the multiple rectangular blocks 34 is engaged with multiple oil return channels 25. The inner side of the retaining ring 12 is provided with a limiting part 35. Multiple inclined plates 24 are evenly fixedly connected to the side wall of the retaining ring 12. An oil injection hole is opened on the tube wall of the sleeve 1, and a sealing plug 27 is connected inside the oil injection hole. The oil injection hole and the sealing plug 27 facilitate the addition of high viscosity lubricating oil. A first chamfer with an annular structure is opened at the corner of the top block 10. A backstop ring 11 is fixedly connected inside the outer shell 6, and a second chamfer is opened at the corner of the backstop ring 11, and the second chamfer cooperates with the first chamfer. A frustum 16 is fixedly connected to the side of the groove away from the groove opening. A positioning hole that cooperates with the frustum 16 is opened at the center of one end of the support part 36.

[0034] The locking mechanism of this invention, during operation of the rolling mill, activates the hydraulic cylinder 9 to push the top block 10, causing the roller 15 installed in the mounting groove to contact the inclined surface 26 on the connecting part 36. Because the roller 15 is inclined, the radial and axial displacement of the roll 7 is limited, thus fixing the position of the roll 7. Since the hydraulic cylinder 9 has a certain extension distance, when the roller 15 wears, the extension distance of the hydraulic cylinder 9 is used to offset the gap caused by the wear of the roller 15, thereby reducing the working load of the bearing 13. A bushing 22 is sleeved between the support part 36 of the roll 7 and the inner ring of the bearing 13. A retaining ring 12 is provided on the bushing 22. Because the retaining ring... 12 is connected to the oil return channel 25 on the bushing 22 via the rectangular block 34 and the limiting part 35. Therefore, when the roll 7 rotates, its support part 36 drives the bushing 22 to rotate the retaining ring 12 and the inclined plate 24. When the inclined plate 24 rotates, it pushes the lubricating oil in the outer shell 6 and the sleeve 1. When the lubricating oil is pushed by the inclined plate 24, it passes through the gap between the inner and outer rings of the bearing 13. Under the action of the inclined plate 24, there is a pressure difference on both sides of the bearing 13. The lubricating oil flows back through the oil return channel 25 on the bushing 22. Therefore, the balls of the bearing 13 can be fully lubricated. In addition, the oil passage 28 provided on the top block 10 can allow the lubricating oil to enter the mounting groove to lubricate the roller 15.

[0035] Example 3: The difference from Example 1 is that;

[0036] See attached document Figure 7 The adjustment mechanism includes a double-outlet hydraulic cylinder 29. Both ends of the double-outlet hydraulic cylinder 29 are rotatably connected to two support arms 2 via pins. The support frame 3 is provided with two limit rods 30. The opposite ends of the two limit rods 30 are fixedly connected to bushings 31. A support shaft 33 is rotatably connected to both bushings 31. One end of the limit rod 30 is rotatably connected to the side wall of the support arm 2 via a connecting shaft. Two support rods 4 are fixedly connected to the inner side of the support frame 3. A rectangular frame 32 is fixedly connected to the upper end of the two support rods 4. One end of the rectangular frame 32 is fixedly connected to the side wall of the support frame 3, and the inner side of the rectangular frame 32 is sleeved with the shaft wall of the support shaft 33.

[0037] The adjustment mechanism provided in this invention allows for simultaneous action of the double-rod hydraulic cylinder 29 on both support arms 2 during operation. Both support arms 2 oscillate around the pivot when under force, driving the sleeve 1 to move the rolls 7 relative to each other. Since the two support arms 2 are rotatably connected by a connecting shaft with limit rods 30, and the opposite ends of the two limit rods 30 are hinged to the support shaft 33 and bushing 31, when the angle between the two limit rods 30 changes due to the swinging of the support arms 2, the support shaft 33 only undergoes lateral displacement due to the positioning effect of the rectangular frame 32. Therefore, the two support arms 2 can swing synchronously at the same angle, facilitating adjustment of the distance between the two rolls 7. When the support arms 2 swing to their maximum angle, it is convenient for technicians to replace the rolls 7.

[0038] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0039] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A mechatronics intelligent composite precision rolling mill work roll locking device, characterized in that, It includes two rolls (7), two support frames (3), and multiple displacement sensors (5). Both ends of the rolls (7) are provided with support parts (36). The rolls (7) are connected to a locking mechanism through the support parts (36). The locking mechanism is used to install the support rolls (7) and lock the rolls (7) simultaneously in the axial and radial directions to reduce mechanical wear between the shaft components of the rolls (7). The locking mechanism includes a housing (6), which is sleeved on one end of the sleeve (1). At the opening, the displacement sensor (5) is fixed to one side of the housing (6), and the side wall of the housing (6) is fixedly connected to the flange (23). The flange (23) is fixedly connected to the opening of one end of the sleeve (1) by a first bolt. An annular plate (14) is sleeved on the support (36), and the side wall of the annular plate (14) is fixedly connected to the opening of the other end of the sleeve (1) by a second bolt. A double-row deep groove ball bearing (13) is interference-fitted inside the sleeve (1). The inner ring of the bearing (13) is interference-fitted with a bushing (22). The support part (36) passes through the annular plate (14) and is interference-fitted with the inner side of the bushing (22). One end of the support part (36) passes through the bushing (22) and has an inclined surface (26). A top block (10) is fitted inside the outer shell (6). A frustum-shaped groove is formed on one side of the top block (10). Multiple mounting grooves are evenly formed on the inclined surface of the groove, and rollers (15) are provided in the mounting grooves. The roller (15) contacts the inclined plane (26). The side wall of the top block (10) is provided with multiple evenly distributed oil passages (28), and the oil passages (28) are connected to the mounting groove. A hydraulic cylinder (9) is fixedly connected inside the outer shell (6). The output end of the hydraulic cylinder (9) is fixedly connected to one side of the top block (10). A fixing ring (8) is fixedly connected to the pipe wall of the sleeve (1). The side wall of the fixing ring (8) is fixedly connected to the side wall of the support arm (2) by a third bolt. Both of the support frames (3) have notches on one side, and adjustment mechanisms are installed in the notches. The adjustment mechanisms cooperate with the locking mechanisms to adjust the distance between the two rolls (7), and the adjustment mechanisms limit the two rolls (7) to move the same distance. Two symmetrically arranged support arms (2) are rotatably connected within the notch via a rotating shaft. Each of the two support arms (2) has an installation port, and a sleeve (1) is connected to the installation port. The locking mechanism is installed inside the sleeve (1), and the opposite side of the two support arms (2) is connected to the adjustment mechanism.

2. The electromechanical-hydraulic intelligent composite finishing mill work roll locking device according to claim 1, characterized in that, One end of the bushing (22) is provided with a first rolled edge portion (18), the support portion (36) is fitted with a ring (17), the edge of the ring (17) is provided with a second rolled edge portion (21), the second rolled edge portion (21) is fitted with the edge of the first rolled edge portion (18), both sides of the ring (17) are provided with annular protrusions (19), both sides of the annular plate (14) opposite to the first rolled edge portion (18) are provided with annular grooves (20), the two annular grooves (20) are respectively engaged with the two annular protrusions (19), and the sidewalls of the bushing (22) are all Multiple oil return channels (25) are evenly distributed. The end of the bushing (22) away from the first rolled edge (18) passes through the inner ring of the bearing (13) and is fitted with a retaining ring (12). Multiple rectangular blocks (34) are fixedly connected to the inner side of the retaining ring (12). Each of the multiple rectangular blocks (34) is respectively engaged with multiple oil return channels (25). A limiting part (35) is provided on the inner side of the retaining ring (12). Multiple inclined plates (24) are evenly fixedly connected to the side wall of the retaining ring (12). An oil injection hole is opened on the tube wall of the sleeve (1), and a sealing plug (27) is connected in the oil injection hole.

3. The electromechanical-hydraulic intelligent composite finishing mill work roll locking device according to claim 1, characterized in that, The top block (10) has a first chamfer with an annular structure at its corner. The outer shell (6) is fixedly connected with a backstop ring (11), and the backstop ring (11) has a second chamfer at its corner, which is matched with the first chamfer. The side of the groove away from the opening is fixedly connected with a frustum (16), and the center of one end of the support part (36) has a positioning hole that matches the frustum (16).

4. The electromechanical-hydraulic intelligent composite finishing mill work roll locking device according to claim 1, characterized in that, The adjustment mechanism includes a double-rod hydraulic cylinder (29). Both ends of the double-rod hydraulic cylinder (29) are rotatably connected to two support arms (2) respectively through shaft pins. Displacement sensors (5) are installed on both the upper and lower sides of the double-rod hydraulic cylinder (29) for the displacement sensors (5) to collect the displacement of the upper and lower telescopic rods of the double-rod hydraulic cylinder (29) respectively. The support frame (3) is provided with two limit rods (30). The opposite ends of the two limit rods (30) are fixedly connected to bushings (31). A support shaft (33) is rotatably connected in the two bushings (31). One end of the limit rod (30) is rotatably connected to the side wall of the support arm (2) through a connecting shaft.

5. The electromechanical-hydraulic intelligent composite finishing mill work roll locking device according to claim 4, characterized in that, The inner side of the support frame (3) is fixedly connected to two support rods (4), and the upper ends of the two support rods (4) are fixedly connected to a rectangular frame (32). One end of the rectangular frame (32) is fixedly connected to the side wall of the support frame (3), and the inner side of the rectangular frame (32) is sleeved with the shaft wall of the support shaft (33).

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