Safe lifting device for heating mantle

Abstract

The utility model discloses a heating mantle safety lifting device which comprises a support, a mounting frame which is horizontally arranged on the top of the support and located above a heating mantle, an electric lifting mechanism and a pneumatic quick-lifting mechanism are arranged on the mounting frame, an air supply pipeline of the pneumatic quick-lifting mechanism is connected with a high-pressure air storage tank, and a normally-closed electromagnetic valve is arranged on the air supply pipeline. And a plurality of first lifting lugs connected with the electric lifting mechanism and second lifting lugs connected with the pneumatic quick-lifting mechanism are arranged at the top of the heating cover. The lifting device is scientific in principle, compact in structure, high in automation degree, safe and reliable, the height of the heating mantle can be adjusted in normal production, the heating mantle still having the high temperature can be quickly lifted upwards when power failure occurs suddenly, the height is positioned after the heating mantle is lifted to the highest position, and therefore the heating mantle can be conveniently and rapidly lifted. And the damage to the foaming suction line material caused by re-falling is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of PVC calendered artificial leather production, and particularly relates to a safety lifting device for a heating hood. Background Art

[0002] During the foaming and embossing process in the production of PVC calendered artificial leather, a heating hood is required to heat the surface temperature to about 150 °C. At such a high temperature, in case of an emergency power outage, the material stops moving forward, and the electric lifting function of the heating hood is lost. Since the heating tubes in the heating hood have stored heat, they continuously heat the surface of the material, and the surface of the material instantly generates high temperature, which is prone to fire and has poor safety. The traditional method is to add a crank to another output shaft of the electric lifting reducer and manually lift the heating hood. However, since there is at least 1 minute from the power outage to manual operation, the fire accident has already occurred before the heating hood is lifted. Therefore, the heating hood system has great potential safety hazards and urgently needs to be improved. Content of the Utility Model

[0003] In order to solve the above technical problems existing in the prior art, the utility model provides a safety lifting device for a heating hood that can immediately lift the heating hood at the moment of power outage and avoid the material in the foaming and embossing process from catching fire due to heat.

[0004] The utility model adopts the following technical scheme: a safety lifting device for a heating hood, including a bracket. A mounting frame located above the heating hood is horizontally arranged at the top of the bracket. An electric lifting mechanism and a pneumatic quick-lifting mechanism are arranged on the mounting frame. The air supply pipeline of the pneumatic quick-lifting mechanism is connected to a high-pressure gas storage tank, and a normally closed solenoid valve is arranged on the air supply pipeline. A plurality of first lifting lugs connected to the electric lifting mechanism and a second lifting lug connected to the pneumatic quick-lifting mechanism are arranged on the top of the heating hood.

[0005] The electric lifting mechanism includes a motor reducer, a left driving shaft, a right driven shaft, a driving sprocket and a driven sprocket. The left driving shaft and the right driven shaft are both horizontally arranged in the front-to-back direction. The front and rear sides of the left driving shaft are rotatably connected to the left side of the mounting frame through the left bearing seat, and the front and rear sides of the right driven shaft are rotatably connected to the right side of the mounting frame through the right bearing seat. The output shaft of the motor reducer is transmission-connected to the left end or the right end of the left driving shaft. The driving sprocket and the driven sprocket have the same structure and are both provided with two. The two driving sprockets are respectively installed on the front and rear sides of the left driving shaft through flat keys, and the two driven sprockets are respectively installed on the right side through flat keys. The front and rear sides of the driven shaft correspond to the two driving sprockets on the left and right respectively. The driving sprocket and the driven sprocket are both provided with the same transmission chain disk and lifting chain disk at front and rear intervals. The transmission chain disk of the front driving sprocket and the transmission chain disk of the front driven sprocket, as well as the transmission chain disk of the rear driving sprocket and the transmission chain disk of the rear driven sprocket are all synchronously driven through an annular transmission chain. A lifting chain is meshed on the lifting chain disks of the two driving sprockets and the two driven sprockets, and the lower ends of the lifting chains are connected to a first lifting ear directly below, and the upper ends of the lifting chains are fixedly connected to the meshed lifting chain disks.

[0006] The pneumatic quick-lift mechanism includes a left mounting rod, a right mounting rod, four quick-lift sprockets and four cylinders. The left mounting rod and the right mounting rod are both horizontally arranged in the front-to-back direction. Both ends of the left mounting rod and the right mounting rod are fixedly connected to the mounting frame. The left mounting rod is located on the right side of the left driving shaft, and the right mounting rod is located on the left side of the right driven shaft. Two of the quick-lift sprockets are respectively connected to the front and rear sides of the left driving shaft for coaxial rotation, and the other two quick-lift sprockets are respectively connected to the front and rear sides of the right driven shaft for coaxial rotation. A quick-lift chain is meshed and connected to each of the four quick-lift sprockets. The lower end of each quick-lift chain is connected to the second lifting ear below, and the upper end of each quick-lift chain is connected to the outer end of the telescopic rod of a cylinder. Each cylinder is arranged in the left and right directions. The right end of the cylinder body of the cylinder connected to the quick-lift chain meshing with the quick-lift sprocket on the left active shaft is hinged on the right mounting rod, and the right end of the cylinder body of the cylinder connected to the quick-lift chain meshing with the quick-lift sprocket on the right driven shaft is hinged on the left mounting rod. The high-pressure air pipes connected to the four cylinders are connected in parallel, and the air inlet ends of the four high-pressure air pipes are connected to the air supply pipeline through five-way joints.

[0007] The two quick-lift sprockets on the left are rotatably connected to the left driving shaft through two left bearings spaced front and back, and the two quick-lift sprockets on the right are rotatably connected to the right driven shaft through two right bearings spaced front and back;

[0008] A ratchet is coaxially arranged on the front or rear side of each quick-lift sprocket, and two pawl assemblies are installed on the left side of the left mounting rod and the left side of the right mounting rod. The two pawl assemblies connected to the left mounting rod respectively cooperate with the two ratchets on the left side to limit the one-way rotation of the ratchet, and the two pawl assemblies connected to the right mounting rod respectively cooperate with the two ratchets on the right side to limit the one-way rotation of the ratchet.

[0009] With the above technical solution, the specific use process of the present utility model is as follows: During normal production, the compressed air in the high-pressure gas storage tank is always in a standby state. The normally closed solenoid valve on the air supply pipeline is normally closed when powered on, and the four cylinders are not ventilated inside. When it is necessary to adjust the height of the heating hood, start the motor reducer, drive the two driving sprockets on the left driving shaft to rotate. The driving chain disks on the driving sprockets drive the driving chain disks of the right driven sprockets to rotate synchronously through the driving chains. The lifting chain disks of the driving sprockets and the driven sprockets rotate synchronously, and the lifting chains engaged on the lifting chain disks move the heating hood up or down. After the height position of the heating hood is adjusted, turn off the motor reducer and fix the left driving shaft and the right driven shaft.

[0010] When a sudden power outage occurs, the normally closed solenoid valve opens after power failure. The compressed air in the high-pressure gas storage tank enters the cylinder bodies of the four cylinders simultaneously through the air supply pipeline, the five-way joint, and the four air supply pipelines in sequence, driving the piston to move towards the hinged end of the cylinder body. The piston drives the telescopic rod to retract into the cylinder body, and the four quick-lifting chains move upward rapidly at the same time, thereby quickly lifting the heating hood upward. During the upward movement of the quick-lifting chains, the quick-lifting sprockets and the ratchets are driven to rotate (at this time, the left driving shaft and the right driving shaft do not rotate). Due to the set pawl assembly being engaged with the ratchet, the ratchet can only rotate in one direction, which can prevent the ratchet from rotating in the reverse direction, thus avoiding the heating hood from rising and then falling when the air pressure in the high-pressure gas storage tank is insufficient.

[0011] The left driving shaft and the right driven shaft in the present utility model serve as the power shafts for daily lifting of the heating hood and as the fixed support shafts for pneumatic lifting in case of power failure. One shaft is used for two purposes, and the pneumatic quick lifting and the electric lifting adjustment do not interfere with each other. In particular, the cooperation of the set ratchet and pawl assembly ensures that the heating hood will not drop during pneumatic quick lifting.

[0012] Synchronous rotation between the driving sprocket and the driven sprocket is achieved through the engagement of the set driving chain and the two driving chain disks.

[0013] The upper end of the lifting chain is fixedly connected to the lifting chain disk, and the rotation angle of the lifting chain disk is not greater than 306°. By using an appropriate diameter of the lifting chain disk, the heating hood can be lifted to an appropriate height.

[0014] In summary, the principle of the present utility model is scientific, the structure is compact, the degree of automation is high, it is safe and reliable. It can not only adjust the height of the heating hood during normal production, but also quickly lift the heating hood with still relatively high temperature upward when a sudden power outage occurs. After lifting to the highest position, the height is positioned to avoid damage to the foamed and embossed material caused by falling again. Brief Description of the Drawings

[0015] Figure 1 is the elevation structure schematic diagram of the present utility model;

[0016] Figure 2 is the top view of the present utility model;

[0017] Figure 3 is the schematic diagram of the distribution of the lifting lugs on the top surface of the heating hood;

[0018] Figure 4 is Figure 2 the schematic assembly structure diagram of the medium fast-lifting sprocket, ratchet and pawl assembly in

[0019] Figure 5 is Figure 2 the schematic structure diagram of the driving sprocket in

[0020] Figure 6 is the schematic diagram of the air supply pipeline connected to four cylinders. Specific embodiments

[0021] The following further describes in detail the embodiments of the present utility model with reference to the accompanying drawings and embodiments.

[0022] As Figures 1 - 6 shown, a heating hood safety lifting device of the present utility model includes a bracket 1. A mounting frame 3 is horizontally provided at the top of the bracket 1 and is located above the heating hood 2. An electric lifting mechanism and a pneumatic fast-lifting mechanism are provided on the mounting frame 3. The air supply pipeline 4 of the pneumatic fast-lifting mechanism is connected to a high-pressure gas storage tank 5. A normally closed solenoid valve 6 is provided on the air supply pipeline 4. Four first lifting lugs 7 connected to the electric lifting mechanism and four second lifting lugs 8 connected to the pneumatic fast-lifting mechanism are provided on the top of the heating hood 2.

[0023] The electric lifting mechanism includes a motor reducer 9, a left driving shaft 10, a right driven shaft 11, a driving sprocket 12 and a driven sprocket 13. The left driving shaft 10 and the right driven shaft 11 are both horizontally arranged in the front-rear direction. The front and rear sides of the left driving shaft 10 are rotatably connected to the left side of the mounting frame 3 through left bearing seats 14, and the front and rear sides of the right driven shaft 11 are rotatably connected to the right side of the mounting frame 3 through right bearing seats 15. The output shaft of the motor reducer 9 is drivingly connected to the left end or the right end of the left driving shaft 10. The driving sprocket 12 and the driven sprocket 13 have the same structure and both have two. The two driving sprockets 12 are respectively mounted on the front and rear sides of the left driving shaft 10 through flat keys 16, and the two driven sprockets 13 are respectively mounted on the front and rear sides of the right driven shaft 11 through flat keys 16 and are respectively in one-to-one correspondence with the two driving sprockets 12 left and right. The driving chain discs 17 and the lifting chain discs 18 of the same type are arranged at intervals in the front-rear direction on both the driving sprocket 12 and the driven sprocket 13. A ring-shaped driving chain 19 is used for synchronous transmission between the driving chain disc 17 of the front driving sprocket 12 and the driving chain disc 17 of the front driven sprocket 13, and between the driving chain disc 17 of the rear driving sprocket 12 and the driving chain disc 17 of the rear driven sprocket 13. A lifting chain 20 is meshed with the lifting chain discs 18 of the two driving sprockets 12 and the two driven sprockets 13. The lower ends of the lifting chains 20 are respectively connected to a first lifting lug 7 directly below, and the upper ends of the lifting chains 20 are fixedly connected to the meshed lifting chain discs 18.

[0024] The pneumatic fast-lifting mechanism includes a left mounting rod 21, a right mounting rod 22, four fast-lifting sprockets 23 and four cylinders 24. The left mounting rod 21 and the right mounting rod 22 are both horizontally arranged in the front-rear direction. Both ends of the left mounting rod 21 and the right mounting rod 22 are fixedly connected to the mounting frame 3. The left mounting rod 21 is located on the right side of the left driving shaft 10, and the right mounting rod 22 is located on the left side of the right driven shaft 11. Two of the four fast-lifting sprockets 23 are respectively rotatably connected to the front and rear sides of the left driving shaft 10 coaxially, and the other two fast-lifting sprockets 23 are respectively rotatably connected to the front and rear sides of the right driven shaft 11 coaxially. A fast-lifting chain 25 is meshed and connected to each of the four fast-lifting sprockets 23. The lower end of each fast-lifting chain 25 is connected to a second lifting lug 8 below, and the upper end of each fast-lifting chain 25 is connected to the outer end of the telescopic rod of a cylinder 24. Each cylinder 24 is arranged in the left-right direction. The right end of the cylinder block of the cylinder 24 connected to the fast-lifting chain 25 meshed with the fast-lifting sprocket 23 on the left driving shaft 10 is hinged to the right mounting rod 22, and the right end of the cylinder block of the cylinder 24 connected to the fast-lifting chain 25 meshed with the fast-lifting sprocket 23 on the right driven shaft 11 is hinged to the left mounting rod 21. The high-pressure air pipes 26 respectively connected to the four cylinders 24 are in parallel, and the intake ends of the four high-pressure air pipes 26 are connected to the air supply pipeline 4 through a five-way joint 27.

[0025] The two fast - rising sprockets 23 on the left are rotatably connected to the left driving shaft 10 through two left bearings 28 spaced front and back, and the two fast - rising sprockets 23 on the right are rotatably connected to the right driven shaft 11 through two right bearings spaced front and back;

[0026] On the front or back side of each fast - rising sprocket 23, a ratchet 29 is axially provided. On the left side of the left mounting rod 21 and the left side of the right mounting rod 22, two pawl assemblies 30 (including pawls and tension springs) are installed. The two pawl assemblies 30 connected to the left mounting rod 21 cooperate with the two ratchets 29 on the left respectively to limit the one - way rotation of the ratchet 29, and the two pawl assemblies 30 connected to the right mounting rod 22 cooperate with the two ratchets 29 on the right respectively to limit the one - way rotation of the ratchet 29.

[0027] The specific process of using this utility model is as follows: During normal production, the compressed air in the high - pressure gas storage tank 5 is always in a standby state. The normally - closed solenoid valve 6 on the air supply pipeline 4 is normally closed when it is powered on, and the four cylinders 24 are not ventilated inside. When it is necessary to adjust the height of the heating hood 2, start the motor reducer 9 to drive the two driving sprockets 12 of the left driving shaft 10 to rotate. The driving chain discs 17 on the driving sprockets 12 drive the driving chain discs 17 of the right driven sprockets 13 to rotate synchronously through the driving chain 19. The lifting chain discs 18 of the driving sprockets 12 and the driven sprockets 13 rotate synchronously, and the lifting chain 20 meshed with the lifting chain discs 18 moves the heating hood 2 up or down. After the height position of the heating hood 2 is adjusted, turn off the motor reducer 9 and fix the left driving shaft 10 and the right driven shaft 11.

[0028] When a sudden power outage occurs, the normally - closed solenoid valve 6 is opened after power failure. The compressed air in the high - pressure gas storage tank 5 enters the cylinder bodies of the four cylinders 24 simultaneously through the air supply pipeline 4, the five - way joint 27 and the four air supply pipelines 4 in sequence, driving the piston to move towards the hinged end of the cylinder body. The piston drives the telescopic rod to retract into the cylinder body, and the four fast - rising chains 25 move upwards quickly at the same time, thereby quickly lifting the heating hood 2 upwards. During the upward movement of the fast - rising chain 25, it drives the fast - rising sprocket 23 and the ratchet 29 to rotate (at this time, the left driving shaft 10 and the right driving shaft do not rotate). Due to the engagement of the pawl assembly 30 and the ratchet 29, the ratchet 29 can only rotate in one direction, which can prevent the ratchet 29 from rotating in the reverse direction, thus avoiding the heating hood 2 from rising and then falling when the air pressure in the high - pressure gas storage tank 5 is insufficient.

[0029] In this utility model, components such as the cylinder 24, the motor reducer 9, the ratchet 29 and the pawl assembly 30 are all existing technologies and can be purchased on the market. Therefore, the specific structure and working principle will not be elaborated here.

[0030] The above embodiments illustrate the basic principles and features of the present utility model. However, the above only illustrates the preferred embodiments of the present utility model and is not limited by the said embodiments. Those of ordinary skill in the art, inspired by this patent, can also make many forms of deformation and improvement without departing from the purpose of the present utility model and the scope protected by the claims. These all fall within the protection scope of the present utility model. Therefore, the patent and protection scope of the present utility model shall be subject to the appended claims.

Claims

1. A heating hood safety lifting device, comprising a bracket, a mounting frame located above the heating hood is horizontally arranged on the top of the bracket, and is characterized in that: An electric lifting mechanism and a pneumatic quick-lifting mechanism are provided on the mounting frame. The air supply pipeline of the pneumatic quick-lifting mechanism is connected to a high-pressure gas storage tank. A normally closed solenoid valve is provided on the air supply pipeline. A plurality of first lifting ears connected to the electric lifting mechanism and a second lifting ear connected to the pneumatic quick-lifting mechanism are provided on the top of the heating hood.

2. A heating cover safety lifting device according to claim 1, characterized in that: The electric lifting mechanism includes a motor reducer, a left driving shaft, a right driven shaft, a driving sprocket and a driven sprocket. The left driving shaft and the right driven shaft are both horizontally arranged in the front-to-back direction. The front and rear sides of the left driving shaft are rotatably connected to the left side of the mounting frame through the left bearing seat, and the front and rear sides of the right driven shaft are rotatably connected to the right side of the mounting frame through the right bearing seat. The output shaft of the motor reducer is transmission-connected to the left end or the right end of the left driving shaft. The driving sprocket and the driven sprocket have the same structure and are both provided with two. The two driving sprockets are respectively installed on the front and rear sides of the left driving shaft through flat keys, and the two driven sprockets are respectively installed on the right side through flat keys. The front and rear sides of the driven shaft correspond to the two driving sprockets on the left and right respectively. The driving sprocket and the driven sprocket are both provided with the same transmission chain disk and lifting chain disk at front and rear intervals. The transmission chain disk of the front driving sprocket and the transmission chain disk of the front driven sprocket, as well as the transmission chain disk of the rear driving sprocket and the transmission chain disk of the rear driven sprocket are all synchronously driven through an annular transmission chain. A lifting chain is meshed on the lifting chain disks of the two driving sprockets and the two driven sprockets, and the lower ends of the lifting chains are connected to a first lifting ear directly below, and the upper ends of the lifting chains are fixedly connected to the meshed lifting chain disks.

3. A heating cover safety lifting device according to claim 2, characterized in that: The pneumatic quick-lift mechanism includes a left mounting rod, a right mounting rod, four quick-lift sprockets and four cylinders. The left mounting rod and the right mounting rod are both horizontally arranged in the front-to-back direction. Both ends of the left mounting rod and the right mounting rod are fixedly connected to the mounting frame. The left mounting rod is located on the right side of the left driving shaft, and the right mounting rod is located on the left side of the right driven shaft. Two of the quick-lift sprockets are respectively connected to the front and rear sides of the left driving shaft for coaxial rotation, and the other two quick-lift sprockets are respectively connected to the front and rear sides of the right driven shaft for coaxial rotation. A quick-lift chain is meshed and connected to each of the four quick-lift sprockets. The lower end of each quick-lift chain is connected to the second lifting ear below, and the upper end of each quick-lift chain is connected to the outer end of the telescopic rod of a cylinder. Each cylinder is arranged in the left and right directions. The right end of the cylinder body of the cylinder connected to the quick-lift chain meshing with the quick-lift sprocket on the left active shaft is hinged on the right mounting rod, and the right end of the cylinder body of the cylinder connected to the quick-lift chain meshing with the quick-lift sprocket on the right driven shaft is hinged on the left mounting rod. The high-pressure air pipes connected to the four cylinders are connected in parallel, and the air inlet ends of the four high-pressure air pipes are connected to the air supply pipeline through five-way joints.

4. A heating cover safety lifting device according to claim 3, characterized in that: The two quick-lift sprockets on the left are rotatably connected to the left driving shaft through two left bearings spaced front and back, and the two quick-lift sprockets on the right are rotatably connected to the right driven shaft through two right bearings spaced front and back; A ratchet is coaxially arranged on the front or rear side of each quick-lift sprocket, and two pawl assemblies are installed on the left side of the left mounting rod and the left side of the right mounting rod. The two pawl assemblies connected to the left mounting rod respectively cooperate with the two ratchets on the left side to limit the one-way rotation of the ratchet, and the two pawl assemblies connected to the right mounting rod respectively cooperate with the two ratchets on the right side to limit the one-way rotation of the ratchet.

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