A three-voltage conversion explosion-proof electric heating vulcanized joint equipment for bonding rubber conveyor belts

Abstract

The present invention provides a three-voltage conversion explosion-proof electric thermal vulcanization joint equipment for bonding rubber conveyor belts, including: two groups of heating plates, an electric control box, a pressure plate, a frame, and a pressurizing device; the electric control box is connected to three power sources of 1140V, 660V, or 380V through a switch; the two groups of heating plates are connected to the frame at intervals from top to bottom; the pressure plate is connected to the frame and fits the lower end of the lower heating plate or the upper end of the upper heating plate, and the pressure plate is connected to the pressurizing device; the frame is a detachable structure, and the heating plate and the pressure plate are both detachably connected to the frame. The electric control box of the present invention is connected to three power sources of 1140V, 660V, or 380V through a switch, which is more convenient to meet different usage requirements than the current two voltages (380V / 660V); the present invention is easy to disassemble and transport, making the present invention more suitable for use in different occasions, especially for mining.

Description

Technical Field

[0001] The invention relates to the technical field of electric heating vulcanization equipment, in particular to a three-voltage conversion explosion-proof electric heating vulcanization joint equipment for bonding rubber conveyor belts. Background Art

[0002] Vulcanizers are mainly used for the vulcanization and molding of rubber products, including flat vulcanizers, four-column vulcanizers, belt vulcanizers, cushion belt vulcanizers and tape vulcanizers. Among them, tape vulcanizers are widely used in the vulcanization and bonding of nylon, canvas and steel rope core transport belts in metallurgy, mining, power plants, ports, building materials and chemical industries. They can also be used for the vulcanization and bonding of tapes with special properties such as corrosion resistance and heat resistance.

[0003] The vulcanization of rubber belts is a process of changing raw rubber into cooked rubber. In this process, pressure, temperature and vulcanization time need to be provided, and the vulcanizer meets this process.

[0004] At present, vulcanizers are usually of an integrated structure, such as CN103737770B, CN208118232U and CN208584703U, which has the defect of being inconvenient to carry; and the current mining vulcanizers are usually two-voltage (380V / 660V) conversion, which is not convenient to meet different usage requirements. Summary of the invention

[0005] The present invention provides a three-voltage conversion flameproof electric heating vulcanization joint device for bonding rubber conveyor belts, which is used to solve at least one of the above technical problems.

[0006] A three-voltage conversion explosion-proof electric heating vulcanization joint equipment for bonding rubber conveyor belts, comprising: two sets of heating plates, an electric control box, a pressure plate, a frame, and a pressurizing device;

[0007] The electric control box is connected to three power sources of 1140V, 660V or 380V through a switch;

[0008] The two groups of heating plates are connected to the frame at intervals; the pressure plate is connected to the frame and fits the lower end of the lower heating plate or the upper end of the upper heating plate, and the pressure plate is connected to the pressurizing device;

[0009] The frame is a detachable structure, and the heating plate and the pressure plate are both detachably connected to the frame.

[0010] Preferably, the pressure plate is a water pressure plate, and the pressurizing device comprises: a pressure pump, and the output end of the pressure pump is connected to the inside of the water pressure plate through a high-pressure water pipe.

[0011] Preferably, the water pressure plate comprises:

[0012] A hydraulic plate body, wherein a rubber plate is arranged on the upper end of the hydraulic plate body, and an integral pressure strip is arranged on the rubber plate;

[0013] The hydraulic plate body, the rubber plate and the integral pressure strip are connected as a whole by a plurality of screws and a second nut;

[0014] A water pressure plate seat, connected to the peripheral side of the water pressure plate body, and a quick connector is connected to the water pressure plate seat for connecting the high-pressure water pipe through the quick connector;

[0015] A plurality of handles are arranged on the peripheral side of the water pressure plate body.

[0016] Preferably, the pressure plate is attached to the lower end of the heating plate below, and further comprises: two groups of heat insulation plates, which are respectively arranged at the upper end of the heating plate above and the lower end of the pressure plate.

[0017] Preferably, the heating plate comprises:

[0018] A heating plate body, wherein one end of the heating plate body is provided with a plurality of mounting grooves, and electric heating plates are arranged in the mounting grooves;

[0019] A cover plate is arranged at one end of the heating plate body where the mounting groove is arranged, and an insulating plate is arranged at one end of the electric heating plate close to the cover plate;

[0020] A mine flameproof low-voltage plug, wherein both ends of the cover plate are provided with mine flameproof low-voltage plugs, and a cable installation through hole is provided in the mine flameproof low-voltage plug;

[0021] A temperature sensor is connected to the heating plate body, and the temperature sensor is electrically connected to the electric control box through a mining cable;

[0022] The heating control cable of the electric control box is connected to the electric heating plate through a mining cable, and the mining cable is installed in the cable installation through hole.

[0023] Preferably, the frame comprises: an upper frame body and a lower frame body, and the upper frame body and the lower frame body are fixedly connected by a fastening screw and a fastening nut.

[0024] Preferably, the lower frame includes:

[0025] Two fork rods are arranged front and back, the two fork rods are fixedly connected as a whole through a first fixing block, and the fork rod is formed by hinged middle parts of two third connecting rods arranged front and back;

[0026] A first rotating shaft and two fourth connecting rods, wherein the first rotating shaft is arranged between the two inner third connecting rods, and the two fourth connecting rods are rotatably connected to the inner sides of the upper ends of the two inner third connecting rods through the first rotating shaft;

[0027] A first fixing plate, fixedly connected to the left upper ends of the two fourth connecting rods;

[0028] Two fifth connecting rods are rotatably connected to the outer sides of the two outer third connecting rods through the two second rotating shafts respectively;

[0029] The second fixed plate is fixedly connected to the right upper ends of the two fifth connecting rods.

[0030] Preferably, the pressurizing device comprises:

[0031] The horizontal mounting plate is arranged parallel to and directly below the pressure plate and is fixedly connected to the frame;

[0032] Two first sleeves are fixedly connected to the left and right sides of the middle part of the lower end of the horizontal mounting plate;

[0033] Two vertical guide rods, the upper ends of which are fixedly connected to the lower end of the pressure plate, and the lower ends of the two vertical guide rods respectively penetrate the upper and lower ends of the two sleeves;

[0034] Two first springs are respectively sleeved on the outside of the two vertical guide rods, the upper ends of the two first springs are fixedly connected to the lower end of the pressure plate, and the lower ends of the two first springs are fixedly connected to the upper end of the horizontal mounting plate;

[0035] Two drive motor devices are connected to the frame at intervals in front and behind;

[0036] Two rotating disks are respectively fixedly connected to the output rotating shafts of the driving motor device;

[0037] A connecting rod assembly, a connecting rod assembly is fixedly connected to the left side of one turntable, and a connecting rod assembly is fixedly connected to the right side of another turntable, and the connecting rod assembly includes:

[0038] A first connecting rod, one end of which is fixedly connected to the left side or the right side of the turntable;

[0039] A second connecting rod, wherein both upper and lower ends of the second connecting rod are fixedly connected to the first U-shaped fixing block;

[0040] The other end of the first connecting rod is rotated on the inner side of the first U-shaped fixing block at the lower end through the rotating shaft, and the lower end of the vertical guide rod is rotatably connected to the inner side of the first U-shaped fixing block at the upper end through the rotating shaft.

[0041] Preferably, the conveyor belt feed direction is the front-to-back direction, and the device further comprises a locking and positioning device, which comprises:

[0042] A second fixing block is fixedly connected to the frame and is located on the left and / or right side below the heating plate;

[0043] Two second U-shaped fixing blocks are arranged at the upper end of the second fixing block at intervals on the left and right sides;

[0044] The electric telescopic rod has a fixed end which is rotatably connected to a second U-shaped fixed block away from the frame via a third rotating shaft;

[0045] The support rod has a lower end which is rotatably connected to a second U-shaped fixing block close to the frame via a fourth rotating shaft;

[0046] A first clamping rod, fixedly connected to a side of the support rod close to the frame;

[0047] A second guide rod, fixedly connected to the upper end of the support rod;

[0048] A second sleeve, sleeved on the outer side of the second guide rod;

[0049] A second clamping rod is rotatably connected to the upper end of the second guide rod via a fifth rotating shaft;

[0050] A fourth U-shaped fixing block, fixedly connected to a side of the second clamping rod away from the frame;

[0051] A sixth connecting rod, the upper end of which is rotatably connected to the fourth U-shaped fixing block via a sixth rotating shaft;

[0052] Two third U-shaped fixing blocks, one third U-shaped fixing block is fixedly connected to the telescopic end of the electric telescopic rod, and the other third U-shaped fixing block is fixedly connected to the lower end of the sixth connecting rod, and the two third U-shaped fixing blocks are rotatably or fixedly connected to the front and rear sides of the second sleeve through the second connecting shaft;

[0053] The third rotating shaft, the fourth rotating shaft, the fifth rotating shaft, the sixth rotating shaft and the second connecting shaft are all arranged front to back;

[0054] The second spring has an upper end fixedly connected to the lower end of the second clamping rod, and a lower end fixedly connected to the upper end of the second sleeve.

[0055] Preferably, a controller is provided in the electric control box, the heating plate is connected to a temperature sensor, the heating plate and the temperature sensor are electrically connected to the controller respectively, the controller is connected to a protection circuit, and the protection circuit includes a first protection module, a second protection module, and a third protection module;

[0056] The first protection module includes:

[0057] Field effect transistor, the drain is connected to the controller power supply;

[0058] A third capacitor, one end of which is connected to the drain of the field effect tube and the controller power supply, and the other end is grounded;

[0059] A sixth resistor, one end of which is connected to the drain of the field effect transistor;

[0060] A seventh resistor and a fifth resistor, wherein one end of the seventh resistor is connected to the drain of the field effect transistor, and the other end is connected to one end of the fifth resistor and the gate of the field effect transistor;

[0061] A silicon controlled rectifier, an anode of which is connected to the other end of the fifth resistor and the other end of the sixth resistor, and a cathode of which is grounded;

[0062] a fourth resistor, one end of which is connected to the silicon controlled rectifier;

[0063] a first diode, with an anode connected to the other end of the fourth resistor and a cathode connected to the gate of the silicon controlled rectifier;

[0064] A third diode, with an anode connected to the anode of the first diode and a cathode connected to the ground via a second capacitor;

[0065] A third resistor, one end of which is connected to the cathode of the third diode, and the other end of which is connected to the source connection of the field effect transistor;

[0066] A first resistor, one end of which is connected to the cathode of the first diode and the gate of the silicon controlled rectifier, and the other end of which is connected to the source of the field effect transistor;

[0067] A second resistor, one end of which is connected to the source of the field effect tube;

[0068] A ninth resistor, one end of which is connected to the source of the field effect tube;

[0069] The tenth resistor has one end connected to the source of the field effect tube;

[0070] a fourth diode, the anode of which is connected to the other end of the second resistor, the other end of the ninth resistor, and the other end of the tenth resistor;

[0071] A second diode, the anode of which is connected to the cathode of the fourth diode, and the cathode of the second diode is connected to the controller;

[0072] The second protection module comprises:

[0073] A first capacitor is connected in parallel with both ends of the heating plate;

[0074] a thirteenth resistor, a first end of which is connected to the first end of the heating plate;

[0075] a twelfth resistor, one end of which is connected to the first power supply, and the other end of which is connected to the second end of the thirteenth resistor;

[0076] a second fuse, one end of which is connected to the second end of the thirteenth resistor;

[0077] a sixth diode, with a cathode connected to the other end of the second fuse and a positive electrode grounded;

[0078] an eleventh resistor, one end of which is connected to the cathode of the sixth diode, and the other end of which is connected to the controller;

[0079] A fifth diode, with an anode connected to the ground and a cathode connected to the controller via an eighth resistor;

[0080] A first fuse, one end of which is connected to the cathode of the fifth diode, and the other end of which is connected to the second end of the heating plate and to the ground;

[0081] The third protection module comprises:

[0082] The first integrated chip has an input end connected to the output end of the stable sensor and a power supply end connected to the second power supply;

[0083] An operational amplifier, wherein the positive input terminal is connected to the output terminal of the first integrated chip, and the negative input terminal is grounded via a fifteenth resistor;

[0084] a fourteenth resistor, one end of which is connected to the negative input terminal of the operational amplifier, and the other end of which is connected to the output terminal of the operational amplifier;

[0085] The second integrated chip has an input end connected to the output end of the operational amplifier and an output end connected to the controller.

[0086] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0088] Figure 1 It is a schematic diagram of the structure of the present invention.

[0089] Figure 2 This is the front view of the electric control box.

[0090] Figure 3 This is a side view of the electric control box.

[0091] Figure 4 This is a schematic diagram of the structure of a manual pressure pump.

[0092] Figure 5 A top view of the water pressure plate.

[0093] Figure 6 for Figure 5 Side view of.

[0094] Figure 7 for Figure 6 A partial enlarged view of area A in the middle.

[0095] Figure 8 A top view of the heating plate.

[0096] Fig. 9 for Figure 8 A cross-sectional view of the BB.

[0097] Fig.10 for Fig. 9 Schematic diagram of a partial enlargement of part C.

[0098] Fig.11The electrical schematic diagram of the temperature control box in one embodiment of the present invention.

[0099] Fig.12 The figure is a schematic structural diagram of an embodiment of a pressurizing device.

[0100] Fig.13 It is a structural schematic diagram of an embodiment of a lower frame.

[0101] Fig.14 FIG. 4 is a circuit diagram of the protection circuit of the present invention.

[0102] Fig.15 It is a structural schematic diagram of an embodiment of the locking and positioning device of the present invention.

[0103] In the figure: 1. Heating plate; 11. Heating plate body; 12. Cover plate; 13. Mining flameproof low-voltage plug; 14. Temperature sensor; 15. Mining cable; 16. Electric heater; 17. Insulation plate; 2. Electric control box; 3. Pressure plate; 31. Water pressure plate; 311. Water pressure plate body; 312. Rubber plate; 313. Overall pressure strip; 314. Water pressure plate seat; 315. Handle; 316. Screw; 317. Second nut; 4. Frame; 41. Upper frame; 42. Lower frame; 421. Third connecting rod; 422. First rotating shaft; 423. Fourth connecting rod; 424 , first fixed plate; 425, fifth connecting rod; 426, second fixed plate; 427, second rotating shaft; 428, first fixed block; 43, fastening screw; 44, fastening nut; 5, pressurizing device; 51, horizontal mounting plate; 52, first sleeve; 53, vertical guide rod; 54, first spring; 55, turntable; 56, connecting rod assembly; 561, first connecting rod; 562, second connecting rod; 563, first U-shaped fixed block; 57, manual pressure pump; 58, driving motor device; 6, heat insulation board; 7, locking and positioning device; 71, second fixed block; 72, second U-shaped fixing block; 73, electric telescopic rod; 74, support rod; 75, first clamping rod; 76, second guide rod; 77, second sleeve; 78, second clamping rod; 79, third U-shaped fixing block; 710, fourth U-shaped fixing block; 711, third rotating shaft; 712, fourth rotating shaft; 713, fifth rotating shaft; 714, first connecting shaft; 715, second spring; 716, sixth connecting rod; 717, sixth rotating shaft; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7 , the seventh resistor; R8, the eighth resistor; R9, the ninth resistor; R10, the tenth resistor; R11, the eleventh resistor; R12, the twelfth resistor; R13, the thirteenth resistor; R14, the fourteenth resistor; R15, the fifteenth resistor; C1, the first capacitor; C2, the second capacitor; C3, the third capacitor; Q, the field effect transistor; D1, the first diode; D2, the second diode; D3, the third diode; D4, the fourth diode; D5, the fifth diode; D6, the sixth diode; D7, the thyristor rectifier; F1, the first fuse; F2, the second fuse. DETAILED DESCRIPTION

[0104] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0105] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0106] The embodiment of the present invention provides a three-voltage conversion flameproof electric heating vulcanization joint device for bonding rubber conveyor belts, such as Figure 1-11 As shown, it includes: two sets of heating plates 1, an electric control box 2, a pressure plate 3, a frame 4, and a pressurizing device 85;

[0107] The electric control box 2 is connected to three power sources of 1140V, 660V or 380V through a switch;

[0108] The two groups of heating plates 1 are connected to the frame 4 at intervals; the pressure plate 3 is connected to the frame 4 and is attached to the lower end of the lower heating plate 1 or the upper end of the upper heating plate 1, and the pressure plate 3 is connected to the pressure device 85; the pressure device can be detachably connected to the frame or be an independent mechanism;

[0109] The frame 4 is a detachable structure, and the heating plate and the pressure plate are both detachably connected to the frame (the heating plate can be detachably connected to the frame by screws, or a through hole can be provided for the fixing screw to pass through, and nuts can be used to fasten, and the pressure plate can be directly placed on the upper end of the lower frame or connected by screws). Preferably, the frame 4 includes: an upper frame body 41 and a lower frame body 42, and the upper frame body 41 and the lower frame body 42 are fixedly connected by a fastening screw 43 and a fastening nut 44.

[0110] The above-mentioned electric control box, heating plate, pressure plate and pressure device can all adopt existing technologies. The above-mentioned pressure device is used to provide pressure to the pressure plate to provide the pressure required for vulcanization of the rubber belt, and to provide the temperature and time required for vulcanization of the rubber belt through the electric control box and the heating plate. This principle is existing technology and will not be repeated here.

[0111] The working principle and beneficial effects of the above technical solution are as follows: the electric control box 2 is connected to three power sources of 1140V, 660V or 380V by switching the switch, which is more convenient to meet different usage requirements compared with the current two voltages (380V / 660V);

[0112] The frame 4 is a detachable structure, the heating plate and the pressure plate are both detachably connected to the frame, and the electric control box is a mechanism independent of the frame. The pressurizing device can be detachably connected to the frame or be an independent mechanism, thereby facilitating the disassembly and transportation of the present invention, making the present invention more suitable for use in different occasions, especially for mining.

[0113] In one embodiment, the pressure plate 3 is a water pressure plate 31, and the pressurizing device 85 includes: a pressure pump, and the output end of the pressure pump is connected to the inside of the water pressure plate 31 through a high-pressure water pipe. Preferably, the pressure pump is a manual pressure pump 57, which can be an existing manual pressure pump.

[0114] The working principle and beneficial effects of the above technical solution are as follows: the above technical solution has a simple structure and is safer through water pressure than oil pressure.

[0115] In one embodiment, Figure 5-7 As shown, the water pressure plate 31 includes:

[0116] A hydraulic plate body 311, a rubber plate 312 is disposed on the upper end of the hydraulic plate body 311, and an integral pressure strip 313 is disposed on the rubber plate 312;

[0117] The hydraulic plate body 311, the rubber plate 312, and the integral pressure strip 313 are connected as a whole through a plurality of screws 316 and a second nut 317; preferably, a washer is further provided between the nut and the integral pressure strip.

[0118] The water pressure plate seat 314 is connected to the periphery of the water pressure plate body 311. The water pressure plate seat 314 is connected to a quick connector (which may be an existing water pipe quick connector) for connecting the high-pressure water pipe through the quick connector;

[0119] A plurality of handles 315 are disposed on the periphery of the hydraulic plate body 311 .

[0120] The working principle and beneficial effects of the above technical solution are as follows: the above structure is simple, and the rubber plate is expanded by water pressure to provide pressure. The water pressure plate, the rubber plate, and the integral pressure strip are connected as a whole by a number of screws and a second nut. The connection is reliable, ensuring the reliability of the overall structure of the integral water pressure plate and avoiding water leakage. A handle is provided for easy transportation.

[0121] In one embodiment, Figure 1 As shown, the pressure plate 3 is attached to the lower end of the heating plate 1 below, and also includes: two groups of insulation plates 6, which are respectively arranged on the upper end of the heating plate 1 above and the lower end of the pressure plate 3.

[0122] The working principle and beneficial effects of the above technical solution are: a heat insulation board is provided for heat insulation to ensure the vulcanization effect of the rubber conveyor belt.

[0123] In one embodiment, Figure 8-10 As shown, the heating plate 1 comprises:

[0124] The heating plate body 11 has a plurality of mounting grooves (corresponding to Fig. 9 The installation groove is provided with a heating plate 16;

[0125] A cover plate 12 is arranged at one end of the heating plate body 11 where the mounting groove is arranged, and an insulating plate 17 is arranged at one end of the electric heating plate close to the cover plate 12;

[0126] A mine flameproof low-voltage plug 13, wherein the two ends of the cover plate are provided with mine flameproof low-voltage plugs, and a cable installation through hole is provided in the mine flameproof low-voltage plug 13;

[0127] A temperature sensor 14 is connected to the heating plate body 11, and the temperature sensor 14 is electrically connected to the electric control box 2 through a mining cable 15; preferably, the temperature sensor can be a PT100 temperature sensor;

[0128] The heating control cable of the electric control box 2 is connected to the electric heating plate 16 through the mining cable 15, and the mining cable 15 is installed in the cable installation through hole. In this embodiment, the side of the heating plate body can also be connected with a handle for easy transportation.

[0129] The working principle and beneficial effects of the above technical solution are as follows: the above technical solution sets a mine flameproof low-voltage plug, and sets the mine cables connected to the heating plate in the mine flameproof low-voltage plug to achieve flameproof, making the present invention safer; and sets an insulation board for heat preservation.

[0130] like Fig.11 , is the electrical schematic diagram of the temperature control box of the utility model:

[0131] The temperature control box is the switch control appliance of the vulcanizer heating plate. Its main structure consists of a flameproof enclosure, a double-circuit AC contactor, an isolating switch, and protection and control components. The flameproof enclosure is welded with steel plates and has a square box-type screw fastening structure. The entire enclosure consists of a main chamber and a wiring chamber. The cable entry device should use a junction box and a flameproof plug. The AC contactor is the main switch element to connect and disconnect the upper and lower heating plates of the vulcanizer; the isolating switch is usually used to connect and disconnect the power supply under no-load conditions.

[0132] 1. The main cable is connected to the grid power supply; the heating control cable is connected to the upper and lower heating plates through mining cables and flameproof plugs.

[0133] 2. According to the requirements of the adhesive tape to be bonded, adjust the two temperature controllers in the figure to set the heating temperature, and adjust the time relay SJ to set the insulation time, and then turn the conversion switches ZLK1 and ZLK2 to the manual or automatic position to select the working mode.

[0134] 3. Close the isolating switch and press the start button ZQA to start working. At this time, AC contactors 1C and 2C are energized and closed to supply power to the upper and lower heating plates for heating.

[0135] 4. When the heating plate is heated to the preset temperature (usually 145°C), the temperature relay will be activated and the heating plate will enter the heat preservation and heating state.

[0136] 5. When both the upper and lower heating plates reach the selected temperature value, 1J and 2J are closed, and the time relay SJ is energized to make the heating plate enter the insulation timed heating state.

[0137] 6. When the vulcanization time reaches the set time value, the normally closed delayed disconnection contact of the time relay SJ will be activated, the intermediate relay J will lose power, the entire heating control part will lose power and stop, and an alarm signal will be issued, announcing that the power supply is cut off and the work is completed.

[0138] In one embodiment, Fig.13 As shown, the lower frame 42 includes:

[0139] Two fork rods are arranged front and back, and the two fork rods are fixedly connected as a whole through a first fixing block 427. The fork rod is composed of two third connecting rods 421 arranged front and back, which are hinged in the middle (such as Fig.12 , in an X shape); preferably, a fixed support may be provided at the bottom end of the fork rod.

[0140] A first rotating shaft 422 and two fourth connecting rods 423, wherein the first rotating shaft 422 is disposed between the two inner third connecting rods 421, and the two fourth connecting rods 423 are rotatably connected to the inner sides of the upper ends of the two inner third connecting rods 421 through the first rotating shaft 422; the first rotating shaft and the two inner third connecting rods are rotatably connected through bearings, and the two fourth connecting rods are fixedly connected to the first rotating shaft;

[0141] A first fixing plate 424, fixedly connected to the left upper ends of the two fourth connecting rods 423;

[0142] Two fifth connecting rods 425 are rotatably connected to the outer sides of the two outer third connecting rods 421 through two second rotating shafts 427 respectively;

[0143] The second fixing plate 426 is fixedly connected to the right upper ends of the two fifth connecting rods 425 .

[0144] The working principle and beneficial effects of the above technical solution are as follows: two fork rods connected as one by the first fixing block constitute the supporting part of the entire lower frame, and the length of the fork rods can be set as needed to meet the use requirements of different heights;

[0145] When the lower frame needs to be folded and stored, the fork rod is retracted, and then the second fixing plate is manually rotated to the lower right, so that the second fixing plate and the fifth connecting rod connected thereto are vertically downwardly located on the right side of the supporting part as a whole; the first fixing plate is manually rotated to the lower left, so that the first fixing plate and the fifth connecting rod connected thereto are vertically downwardly located on the left side of the supporting part as a whole, so as to facilitate the storage of the descending body;

[0146] When the lower frame needs to be opened, the fork rod is opened. In the opened fork rod, the first fixed plate is supported on the top end of the third connecting rod on the left, and the second fixed plate is supported on the top end of the third connecting rod on the right, and the first fixed plate and the second fixed plate are fitted on the side close to each other.

[0147] The above structure is convenient to store and open, and can be stored without disassembling parts, thus facilitating the use of the present invention.

[0148] In one embodiment, Fig.12 As shown, the pressurizing device 85 includes:

[0149] A horizontal mounting plate 51 is arranged parallel to and directly below the pressure plate 3 and is fixedly connected to the frame;

[0150] Two first sleeves 52 are fixedly connected to the left and right sides of the middle part of the lower end of the horizontal mounting plate 51;

[0151] Two vertical guide rods 53, the upper ends of which are fixedly connected to the lower end of the pressure plate, and the lower ends of the two vertical guide rods 53 respectively penetrate the upper and lower ends of the two first sleeves 52;

[0152] Two first springs 84 are respectively sleeved on the outside of the two vertical guide rods 53, the upper ends of the two first springs 84 are fixedly connected to the lower end of the pressure plate 3, and the lower ends of the two first springs 84 are fixedly connected to the upper end of the horizontal mounting plate 51;

[0153] Two drive motor devices 58 are connected to the frame 4 at intervals in front and back; the drive motor device 58 can be the following structure: including a fixing plate, the fixing plate is connected to the upper end of the lower frame, and the entire pressurizing device is connected to the lower frame through the fixing plate; a motor bracket is fixedly connected to the fixing plate, and the drive motor is fixed on the motor bracket; Fig.12 Only the drive motor arrangement at the front is shown;

[0154] Two rotating disks 55 are respectively fixedly connected to the output rotating shafts of the two driving motor devices; Fig.11 Only the turntable at the front is shown; the turntable at the rear and the drive motor device at the rear can refer to the front;

[0155] Two connecting rod assemblies 56, one connecting rod assembly is fixedly connected to the left side of one rotating disk, and one connecting rod assembly is fixedly connected to the right side of the other rotating disk. The connecting rod assembly 56 includes:

[0156] A first connecting rod 561, one end of which is fixedly connected to the left side or the right side of the rotating disk 55;

[0157] A second connecting rod 562, wherein both upper and lower ends of the second connecting rod 562 are fixedly connected to the first U-shaped fixing block 563;

[0158] The other end of the first connecting rod 561 is rotated on the inner side of the first U-shaped fixing block 563 at the lower end through the rotating shaft, and the lower end of the vertical guide rod 53 is rotatably connected to the inner side of the first U-shaped fixing block 563 at the upper end (ie, the inner side of the U shape) through the rotating shaft.

[0159] The working principle and beneficial effects of the above technical solution are:

[0160] In the figure, one connecting rod assembly is fixedly connected to the right side of the front turntable, and the other connecting rod assembly is fixedly connected to the left side of the rear turntable;

[0161] During operation, the horizontal mounting plate is fixed; the drive motor device rotates to drive the turntable connected to it to rotate. The rotation directions of the two drive motor devices are opposite, so that the turntable connected to the front drive motor device can be rotated to the lower right (or upper right), and the turntable connected to the rear drive motor device can be rotated to the lower left (or upper left), so that the first connecting rod on the right side of the front turntable is rotated to the lower right (or upper right), and the first connecting rod connected to the left side of the rear turntable is rotated to the lower left (or upper left), and the corresponding guide rod is driven downward or upward by the first connecting rod to provide pressure; this technical solution drives the pressure plate to move up and down by the drive motor, and the pressure is more uniform compared with the water pressure plate, and more stable than hydraulic or air pressure, which is more convenient to ensure the vulcanization effect of the present invention.

[0162] In one embodiment, Fig.14 As shown, a controller is arranged in the electric control box 2, the heating plate 1 is connected to a temperature sensor 14, the heating plate 1 and the temperature sensor 14 are electrically connected to the controller respectively, the controller is connected to a protection circuit, and the protection circuit includes a first protection module, a second protection module, and a third protection module;

[0163] The first protection module includes:

[0164] Field effect tube Q, the drain is connected to the controller power supply;

[0165] A third capacitor C3, one end of which is connected to the drain of the field effect tube and the controller power supply, and the other end is grounded;

[0166] A sixth resistor R6, one end of which is connected to the drain of the field effect transistor;

[0167] A seventh resistor R7 and a fifth resistor R5, wherein one end of the seventh resistor R7 is connected to the drain of the field effect transistor, and the other end is connected to one end of the fifth resistor R5 and the gate of the field effect transistor;

[0168] A silicon controlled rectifier, an anode of which is connected to the other end of the fifth resistor R5 and the other end of the sixth resistor R6, and a cathode of which is grounded;

[0169] A fourth resistor R4, one end of which is connected to the silicon controlled rectifier;

[0170] A first diode D1, with an anode connected to the other end of the fourth resistor R4, and a cathode connected to the gate of the silicon controlled rectifier;

[0171] A third diode D3, an anode of which is connected to the anode of the first diode D1, and a cathode of which is grounded via a second capacitor C2;

[0172] A third resistor R3, one end of which is connected to the cathode of the third diode D3, and the other end of which is connected to the source of the field effect transistor;

[0173] A first resistor R1, one end of which is connected to the cathode of the first diode D1 and the gate of the silicon controlled rectifier, and the other end of which is connected to the source of the field effect transistor;

[0174] A second resistor R2, one end of which is connected to the source of the field effect tube;

[0175] A ninth resistor R9, one end of which is connected to the source of the field effect tube;

[0176] A tenth resistor R10, one end of which is connected to the source of the field effect tube;

[0177] A fourth diode D4, an anode of which is connected to the other end of the second resistor R2, the other end of the ninth resistor R9, and the other end of the tenth resistor R10;

[0178] A second diode D2, an anode of which is connected to a cathode of a fourth diode D4, and a cathode of the second diode D2 is connected to a controller;

[0179] The second protection module includes:

[0180] A first capacitor C1 is connected in parallel to both ends of the heating plate 1;

[0181] A thirteenth resistor R13, a first end of which is connected to the first end of the heating plate 1;

[0182] A twelfth resistor R12, one end of which is connected to the first power supply, and the other end of which is connected to the second end of the thirteenth resistor R13;

[0183] A second fuse F2, one end of which is connected to the second end of the thirteenth resistor R13;

[0184] A sixth diode D6, with a cathode connected to the other end of the second fuse F2 and an anode grounded;

[0185] an eleventh resistor R11, one end of which is connected to the cathode of the sixth diode D6, and the other end of which is connected to the controller;

[0186] A fifth diode D5, an anode of which is grounded, and a cathode of which is connected to the controller via an eighth resistor R8;

[0187] A first fuse F1, one end of which is connected to the cathode of the fifth diode D5, and the other end of which is connected to the second end of the heating plate 1 and to the ground;

[0188] The third protection module comprises:

[0189] The first integrated chip has an input end connected to the output end of the stable sensor, and a power end connected to the second power supply; preferably, the first integrated chip is a chip with integrated temperature compensation, amplification and overvoltage and overcurrent protection functions, and the second integrated chip is used to convert the voltage signal into a current signal to facilitate reliable signal transmission.

[0190] An operational amplifier, wherein the positive input terminal is connected to the output terminal of the first integrated chip, and the negative input terminal is grounded via a fifteenth resistor R15;

[0191] A fourteenth resistor R14, one end of which is connected to the negative input terminal of the operational amplifier, and the other end of which is connected to the output terminal of the operational amplifier;

[0192] The second integrated chip has an input end connected to the output end of the operational amplifier and an output end connected to the controller.

[0193] The working principle and beneficial effects of the above technical solution are as follows: in the above first protection module, when the controller power supply voltage is too large, the Q source voltage is too large, so that D3 is turned on, Q2 is turned on, and the gate voltage of Q is reduced, so that Q is cut off, and the protection of the controller is realized; when the controller power supply current is too large, the voltage across R2, R9, and R10 increases, triggering Q2 to turn on, so that the gate voltage of Q is reduced, so that Q is cut off, and the protection of the controller is realized; in the above second protection module, C1 is used for filtering, R12 and R11 are used for current limiting, and overvoltage and overcurrent protection of the heating plate are realized through F1 and F2. When the voltage is too high, the function of D5 and D6 enables the electric energy to be discharged through the reverse path of D5 and D6, so as to realize the protection of the heating plate. The above first integrated chip can be a chip with integrated signal compensation and amplification functions (the first integrated chip can also include overvoltage and overcurrent protection functions), and the second integrated chip is used to convert the voltage signal into a current signal, which is convenient for reliable signal transmission, so as to facilitate the present invention to realize temperature abnormality alarm, so as to realize temperature abnormality protection.

[0194] In one embodiment, the conveyor belt feed direction is the front-to-back direction, and the device further includes a locking and positioning device 7, such as Fig.15 As shown, the locking and positioning device 7 comprises:

[0195] A second fixing block 71 is fixedly connected to the frame and is located on the left and / or right side below the heating plate (i.e., the second fixing block 71 and the following structure connected thereto are simultaneously provided on the left or right side or both sides below the heating plate), and is located at the front end or rear end of the heating plate;

[0196] Two second U-shaped fixing blocks 72 are arranged at an upper end of the second fixing block 71 at intervals on the left and right sides;

[0197] The electric telescopic rod 73, the fixed end of which is rotatably connected to the second U-shaped fixing block 72 away from the frame through the third rotating shaft 711;

[0198] The support rod 74, the lower end of which is rotatably connected to the second U-shaped fixing block 72 close to the frame through the fourth rotating shaft 712;

[0199] A first clamping rod 75, fixedly connected to a side of the support rod 74 close to the frame;

[0200] A second guide rod 76, fixedly connected to the upper end of the support rod 74;

[0201] A second sleeve 77, sleeved on the outer side of the second guide rod 76;

[0202] The second clamping rod 78 is rotatably connected to the upper end of the second guide rod 76 through the fifth rotating shaft 713;

[0203] A fourth U-shaped fixing block 710, fixedly connected to a side of the second clamping rod 78 away from the frame;

[0204] A sixth connecting rod 716, the upper end of which is rotatably connected to the fourth U-shaped fixing block 710 via a sixth rotating shaft 717;

[0205] Two third U-shaped fixing blocks 79, one third U-shaped fixing block 79 is fixedly connected to the telescopic end of the electric telescopic rod 73, and the other third U-shaped fixing block 79 is fixedly connected to the lower end of the sixth connecting rod 716, and the two third U-shaped fixing blocks 79 are rotatably or fixedly connected to the front and rear sides of the sleeve through the second connecting shaft;

[0206] The third rotating shaft 711, the fourth rotating shaft 712, the fifth rotating shaft 713, the sixth rotating shaft 717, and the second connecting shaft are all arranged front to back;

[0207] The second spring 715 has an upper end fixedly connected to the lower end of the second clamping rod 78 , and a lower end fixedly connected to the upper end of the second sleeve 77 .

[0208] The working principle and beneficial effects of the above technical solution are: Fig.13It is a clamping device arranged on the left side of the frame. When clamping, the electric telescopic rod 73 is driven to extend, so that the support rod 74 rotates toward the frame (lower right), so that the first clamping rod 75 is clamped on the left side of the conveyor belt (used for left and right limit of the conveyor belt, and a distance sensor can be arranged on the first clamping rod 75 to detect the distance between it and the conveyor belt in the left and right directions, and timely alarm when the distance is abnormal). At the same time, the sleeve moves upward to compress the spring, and the second clamping rod 78 is rotated to the lower right side through the sixth connecting rod 716 and pressed on the conveyor belt. The above technical scheme can realize left and right limit and upper and lower limit, and downward clamping, which is convenient for reliable positioning of the conveyor belt and ensures the vulcanization effect of the present invention.

[0209] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A three-voltage conversion explosion-proof electric heating vulcanization joint equipment for bonding rubber conveyor belts, characterized in that: include: Two sets of heating plates (1), an electric control box (2), a pressure plate (3), a frame (4), and a pressurizing device (5); The electric control box (2) is connected to three power sources of 1140V, 660V or 380V by switching through a switch; The two groups of heating plates (1) are connected to the frame (4) at intervals in the upper and lower parts; the pressure plate (3) is connected to the frame (4) and is attached to the lower end of the lower heating plate (1) or the upper end of the upper heating plate (1); the pressure plate (3) is connected to the pressure device (5); The frame (4) is a detachable structure, and the heating plate (1) and the pressure plate (3) are both detachably connected to the frame (4); A controller is arranged in the electric control box (2); the heating plate (1) is connected to a temperature sensor (14); the heating plate (1) and the temperature sensor (14) are electrically connected to the controller respectively; the controller is connected to a protection circuit; the protection circuit comprises a first protection module, a second protection module, and a third protection module; The first protection module includes: Field effect transistor (Q), the drain is connected to the controller power supply; A third capacitor (C3), one end of which is connected to the drain of the field effect transistor (Q) and the controller power supply, and the other end is grounded; a sixth resistor (R6), one end of which is connected to the drain of the field effect transistor (Q); a seventh resistor (R7) and a fifth resistor (R5), wherein one end of the seventh resistor (R7) is connected to the drain of the field effect transistor (Q), and the other end is connected to one end of the fifth resistor (R5) and the gate of the field effect transistor (Q); a silicon controlled rectifier (D7), an anode of which is connected to the other end of the fifth resistor (R5) and the other end of the sixth resistor (R6), and a cathode of which is grounded; a fourth resistor (R4), one end of which is connected to the silicon controlled rectifier (D7); A first diode (D1), with an anode connected to the other end of the fourth resistor (R4) and a cathode connected to the gate of the silicon controlled rectifier (D7); A third diode (D3), an anode of which is connected to the anode of the first diode (D1), and a cathode of which is grounded via a second capacitor (C2); A third resistor (R3), one end of which is connected to the cathode of the third diode (D3), and the other end of which is connected to the source of the field effect transistor (Q); A first resistor (R1), one end of which is connected to the cathode of the first diode (D1) and the gate of the silicon controlled rectifier (D7), and the other end of which is connected to the source of the field effect transistor (Q); A second resistor (R2) has one end connected to the source of the field effect transistor (Q); a ninth resistor (R9), one end of which is connected to the source of the field effect transistor (Q); A tenth resistor (R10), one end of which is connected to the source of the field effect transistor (Q); a fourth diode (D4), the anode of which is connected to the other end of the second resistor (R2), the other end of the ninth resistor (R9), and the other end of the tenth resistor (R10); A second diode (D2), the anode of which is connected to the cathode of a fourth diode (D4), and the cathode of the second diode (D2) is connected to the controller; The second protection module includes: A first capacitor (C1) is connected in parallel to both ends of the heating plate (1); A thirteenth resistor (R13), a first end of which is connected to a first end of the heating plate (1); a twelfth resistor (R12), one end of which is connected to the first power supply, and the other end of which is connected to the second end of the thirteenth resistor (R13); A second fuse (F2), one end of which is connected to the second end of the thirteenth resistor (R13); a sixth diode (D6), a cathode connected to the other end of the second fuse (F2), and a positive electrode grounded; an eleventh resistor (R11), one end of which is connected to the cathode of the sixth diode (D6) and the other end of which is connected to the controller; a fifth diode (D5), with an anode connected to the ground and a cathode connected to the controller via an eighth resistor (R8); A first fuse (F1), one end of which is connected to the cathode of the fifth diode (D5), and the other end of which is connected to the second end of the heating plate (1) and to the ground; The third protection module comprises: The first integrated chip has an input end connected to the output end of the stable sensor and a power supply end connected to the second power supply; an operational amplifier, wherein the positive input terminal is connected to the output terminal of the first integrated chip, and the negative input terminal is grounded via a fifteenth resistor (R15); A fourteenth resistor (R14), one end of which is connected to the negative input terminal of the operational amplifier, and the other end of which is connected to the output terminal of the operational amplifier; The second integrated chip has an input end connected to the output end of the operational amplifier and an output end connected to the controller.

2. The three-voltage conversion flameproof electric heating vulcanization joint equipment for bonding rubber conveyor belts according to claim 1 is characterized in that: The pressure plate (3) is a water pressure plate (31), and the pressurizing device (5) comprises: a pressure pump, and the output end of the pressure pump is connected to the inside of the water pressure plate (31) through a high-pressure water pipe.

3. The three-voltage conversion flameproof electric heating vulcanization joint equipment for bonding rubber conveyor belts according to claim 2 is characterized in that: The water pressure plate (31) comprises: A water pressure plate body (311), wherein a rubber plate (312) is disposed on the upper end of the water pressure plate body (311), and an integral pressure strip (313) is disposed on the rubber plate (312); The water pressure plate body (311), the rubber plate (312), and the integral pressure strip (313) are connected as a whole via a plurality of screws (316) and a second nut (317); A water pressure plate seat (314) is connected to the peripheral side of the water pressure plate body (311), and a quick connector is connected to the water pressure plate seat (314) for connecting the high-pressure water pipe via the quick connector; A plurality of handles (315) are arranged on the periphery of the water pressure plate body (311).

4. The three-voltage conversion flameproof electric heating vulcanization joint equipment for bonding rubber conveyor belts according to claim 1 is characterized in that: The pressure plate (3) is attached to the lower end of the heating plate (1) below, and further comprises: two groups of heat insulation plates (6), which are respectively arranged at the upper end of the heating plate (1) above and the lower end of the pressure plate (3).

5. The three-voltage conversion flameproof electric heating vulcanization joint equipment for bonding rubber conveyor belts according to claim 1 is characterized in that: The heating plate (1) comprises: A heating plate body (11), wherein a plurality of mounting grooves are arranged at one end of the heating plate body (11), and electric heating plates (16) are arranged in the mounting grooves; A cover plate (12) is arranged at one end of the heating plate body (11) where the mounting groove is arranged, and an insulating plate (17) is arranged at one end of the electric heating plate (16) close to the cover plate (12); A flameproof low-voltage plug (13) for mining, wherein the flameproof low-voltage plug (13) for mining is arranged at both ends of the cover plate (12), and a cable installation through hole is arranged in the flameproof low-voltage plug (13); A temperature sensor (14) is connected to the heating plate (11), and the temperature sensor (14) is electrically connected to the electric control box (2) via a mining cable (15); The heating control cable of the electric control box (2) is connected to the electric heating plate (16) via a mining cable (15), and the mining cable (15) is installed in the cable installation through hole.

6. The three-voltage conversion flameproof electric heating vulcanization joint equipment for bonding rubber conveyor belts according to claim 1 is characterized in that: The frame (4) comprises an upper frame body (41) and a lower frame body (42), wherein the upper frame body (41) and the lower frame body (42) are fixedly connected via a fastening screw (43) and a fastening nut (44).

7. The three-voltage conversion flameproof electric heating vulcanization joint equipment for bonding rubber conveyor belts according to claim 6 is characterized in that: The lower frame (42) comprises: Two fork rods are arranged front and back, the two fork rods are fixedly connected as a whole through a first fixing block (428), and the fork rods are formed by hinged middle parts of two third connecting rods (421) arranged front and back; A first rotating shaft (422) and two fourth connecting rods (423), wherein the first rotating shaft (422) is arranged between the two inner third connecting rods (421), and the two fourth connecting rods (423) are rotatably connected to the inner sides of the upper ends of the two inner third connecting rods (421) through the first rotating shaft (422); A first fixing plate (424) fixedly connected to the left upper ends of the two fourth connecting rods (423); Two fifth connecting rods (425) are rotatably connected to the outer sides of the two outer third connecting rods (421) respectively through two second rotating shafts (427); The second fixing plate (426) is fixedly connected to the right upper ends of the two fifth connecting rods (425).

8. The three-voltage conversion flameproof electric heating vulcanization joint equipment for bonding rubber conveyor belts according to claim 1 is characterized in that: The pressurizing device (5) comprises: A horizontal mounting plate (51) is arranged parallel to and directly below the pressure plate (3) and is connected to the frame; Two first sleeves (52) are fixedly connected to the left and right sides of the middle part of the lower end of the horizontal mounting plate (51); Two vertical guide rods (53), the upper ends of which are fixedly connected to the lower end of the pressure plate (3), and the lower ends of the two vertical guide rods (53) respectively penetrate the upper and lower ends of the two first sleeves (52); Two first springs (54) are respectively sleeved on the outside of the two vertical guide rods (53), the upper ends of the two first springs (54) are fixedly connected to the lower end of the pressure plate (3), and the lower ends of the two first springs (54) are fixedly connected to the upper end of the horizontal mounting plate (51); Two drive motor devices (58) are connected to the frame (4) at a distance from each other; Two rotating disks (55) are respectively fixedly connected to the output rotating shafts of the driving motor device; A connecting rod assembly (56), wherein the left side of one rotating disk (55) is fixedly connected to a connecting rod assembly (56), and the right side of another rotating disk (55) is fixedly connected to a connecting rod assembly (56), wherein the connecting rod assembly (56) comprises: A first connecting rod (561), one end of which is fixedly connected to the left side or the right side of the rotating disk (55); A second connecting rod (562), wherein both upper and lower ends of the second connecting rod (562) are fixedly connected to the first U-shaped fixing block (563); The other end of the first connecting rod (561) is rotated on the inner side of the first U-shaped fixing block (563) at the lower end via a rotating shaft, and the lower end of the vertical guide rod (53) is rotatably connected to the inner side of the first U-shaped fixing block (563) at the upper end via a rotating shaft.

9. The three-voltage conversion flameproof electric heating vulcanization joint equipment for bonding rubber conveyor belts according to claim 1 is characterized in that: The conveyor belt feed direction is the front-to-back direction. The device further comprises a locking and positioning device (7), and the locking and positioning device (7) comprises: A second fixing block (71) is fixedly connected to the frame (4) and is located on the left and / or right side below the heating plate (1); Two second U-shaped fixing blocks (72) are arranged at intervals on the left and right sides of the upper end of the second fixing block (71); An electric telescopic rod (73), the fixed end of which is rotatably connected to a second U-shaped fixed block (72) away from the frame (4) via a third rotating shaft (711); A support rod (74), the lower end of which is rotatably connected to a second U-shaped fixing block (72) close to the frame (4) via a fourth rotating shaft (712); A first clamping rod (75) fixedly connected to a side of the support rod (74) close to the frame (4); A guide rod (76) fixedly connected to the upper end of the support rod (74); A second sleeve (77) sleeved on the outside of the guide rod (76); A second clamping rod (78) is rotatably connected to the upper end of the guide rod (76) via a fifth rotating shaft (713); A fourth U-shaped fixing block (710) is fixedly connected to a side of the second clamping rod (78) away from the frame (4); A sixth connecting rod (716), the upper end of which is rotatably connected to the fourth U-shaped fixing block (710) via a sixth rotating shaft (717); Two third U-shaped fixing blocks (79), one third U-shaped fixing block (79) is fixedly connected to the telescopic end of the electric telescopic rod (73), and the other third U-shaped fixing block (79) is fixedly connected to the lower end of the sixth connecting rod (716), and the two third U-shaped fixing blocks (79) are rotatably or fixedly connected to the front and rear sides of the second sleeve (77) through a second connecting shaft; The third rotating shaft (711), the fourth rotating shaft (712), the fifth rotating shaft (713), the sixth rotating shaft (717) and the second connecting shaft are all arranged front to back; The second spring (715) has an upper end fixedly connected to the lower end of the second clamping rod (78), and a lower end fixedly connected to the upper end of the second sleeve (77).

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