Explosion-proof forklift and explosion-proof starting motor for explosion-proof forklift

Abstract

The present invention provides an explosion-proof starter motor for an explosion-proof forklift, comprising an explosion-proof housing and an explosion-proof end cover for accommodating a motor body, wherein the explosion-proof housing and the explosion-proof end cover are sealed by a first sealing ring, and the stopper is positioned and then locked and connected by bolts; the front end thread of the explosion-proof end cover is threadedly mounted on a front bearing cover, and the front bearing cover and the transmission mechanism of the motor body are sealed by an oil seal, and the explosion-proof end cover and the front bearing cover are sealed by a second sealing ring, and the explosion-proof end cover and the copper sleeve sleeved on the output shaft of the transmission mechanism are interference-fitted; in addition, the DC series-excited motor, electromagnetic switch and starter relay of the motor body are all two-wire structures. The present application meets the performance requirements of a forklift for safe operation in dangerous environments such as gas and / or dust, eliminates safety hazards, and has a significant explosion-proof effect. The present invention also provides an explosion-proof forklift including the above-mentioned starter motor, which has the same driving performance as an ordinary forklift and has a significant explosion-proof effect.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof forklifts, and more specifically, to an explosion-proof starter motor for an explosion-proof forklift. The present invention also relates to an explosion-proof forklift comprising the explosion-proof starter motor. Background Art

[0002] As we all know, the sparks and arcs generated by live parts such as starter motors and generators are recognized as the largest ignition source, or even the only ignition source, for explosion-proof internal combustion vehicles operating in dangerous explosive environments containing explosive gas mixtures, flammable, and / or conductive dust. In order to ensure the safe operation of explosion-proof internal combustion forklifts, it is necessary to avoid sparks when the starter motor is running, or to ensure that the generated sparks are isolated inside the closed shell to prevent the sparks from leaking. At the same time, the static electricity of the entire vehicle should be eliminated to completely avoid the dangerous situation of sparks caused by electrical component failure and static electricity accumulation.

[0003] At present, most of the internal combustion forklift circuits on the market use a single-wire system. As a part of the circuit, the starter motors mostly use the negative grounding method, which poses a great safety hazard. Summary of the invention

[0004] The purpose of the present invention is to provide an explosion-proof starter motor for an explosion-proof forklift, which can meet the performance requirements of the explosion-proof forklift to operate safely in two dangerous environments, gas and dust, and eliminate safety hazards, with significant explosion-proof effect. Another purpose of the present invention is to provide an explosion-proof forklift including the above-mentioned explosion-proof starter motor, which has the above-mentioned technical advantages.

[0005] The present invention provides an explosion-proof starter motor for an explosion-proof forklift, comprising a transmission mechanism, a DC series-excited motor, an electromagnetic switch and a starting relay, characterized in that the explosion-proof housing and an explosion-proof end cover are also included, the connection portion of the explosion-proof housing is provided with a stopper, the stopper is provided with a first slot body, the first slot body is provided with a first sealing ring, the explosion-proof housing and the explosion-proof end cover are positioned and bolted together through the stopper; the explosion-proof end cover is provided with an installation cavity for the transmission mechanism to pass through; the explosion-proof end cover also includes a front bearing cover threadedly matched with the explosion-proof end cover, the front bearing cover is provided with an oil seal hole, an oil seal is installed in the oil seal hole, the explosion-proof end cover is provided with a second slot body, and a second sealing ring is installed in the second slot body; the explosion-proof end cover is interference-fitted with a copper sleeve sleeved on the output shaft of the transmission mechanism; the DC series-excited motor, the electromagnetic switch and the starting relay are all of a two-wire structure, and two first explosion-proof connectors for respectively leading out the positive and negative shielded cables of the motor are installed on the explosion-proof housing.

[0006] Preferably, the explosion-proof housing and the explosion-proof end cover are both made of aluminum.

[0007] Preferably, the explosion-proof joint is threadedly connected to the explosion-proof housing, and the screwing depth of the explosion-proof joint is not less than 8 mm, and the number of engagement buckles is greater than 6.

[0008] Preferably, the gap between the explosion-proof shell and the explosion-proof end cover is less than 0.2 mm, and the length of the gap is between 12.5 mm and 30 mm.

[0009] Preferably, it also includes an insulating pad for isolating the negative plate inside the DC series-excited motor from the explosion-proof end cover, the negative plate is fixed to the explosion-proof end cover by screws, and the screws are sheathed with an insulating sleeve for insulating the explosion-proof end cover from the negative plate.

[0010] Preferably, the gear assembly in the transmission mechanism adopts an external meshing structure;

[0011] The gear assembly comprises a clutch gear connected to the one-way clutch and a motor gear connected to the DC series-excited motor, and the clutch gear is externally meshed with the motor gear.

[0012] Preferably, it also includes an explosion-proof box installed on the frame, wherein the explosion-proof box is connected to the starting relay through a relay wire to control the operation of the DC series-excited motor;

[0013] The explosion-proof box is provided with a starting module, a leakage detection module and a neutral start protection module. The starting module is electrically connected to the leakage detection module, and the neutral start protection module is electrically connected to the leakage detection module and the starting relay. The leakage detection module is used to detect whether the circuit has leakage. When the leakage detection module detects that the circuit has leakage, the circuit of the neutral start protection module is disconnected, and then the coil of the starting relay is powered off, and the DC series-excited motor does not work. When the leakage detection module does not detect that the circuit has leakage, the neutral start protection module is turned on, and then the coil of the starting relay is turned on, and the DC series-excited motor is started.

[0014] Preferably, the starting module comprises: a relay K1 and a relay K2, wherein the first end of the coil of the relay K1 is connected to the running gear, the first end of the coil of the relay K2 is connected to the starting gear, the first end of the switch of the relay K1 is connected to the key gear, and the second end of the switch of the relay K1 is connected to the neutral start protection module; the second end of the coil of the relay K1 is connected to the second end of the relay K2 as the output end of the starting module;

[0015] The neutral start protection module includes a relay K3, a fuse F8, a controller 18, a reverse gear switch K6 and a forward gear switch K7;

[0016] The coil K3 of the relay K3 is connected in series with the leakage detection module to form a first branch, the switch of the relay K3 is connected in series with the fuse F8 and the switch of the relay K2 to form a second branch, the first branch is connected in parallel with the second branch, and the first common end is connected to the second end of the coil of the relay K1, and the second common end is connected to the controller 18, the first end of the coil of the starter relay is connected to the output end, and the second end of the coil of the starter relay is connected to the controller 18, and the controller 18 is also connected to the reverse gear switch K6 and the forward gear switch K7.

[0017] Preferably, the body of the explosion-proof box is made of aluminum.

[0018] Compared with the above-mentioned background technology, the explosion-proof starter motor for explosion-proof forklift provided by the present invention is achieved by installing the starter motor body inside the explosion-proof housing and the explosion-proof end cover, and the connecting ends of the two are sealed and connected by a stopper and a first sealing ring; the front end of the explosion-proof end cover is installed with a front bearing cover, and the two are threadedly locked together, and the front bearing cover and the explosion-proof end cover are sealed by a second sealing ring, the front bearing cover is provided with an oil seal hole, an oil seal is installed in the oil seal hole, and the transmission mechanism and the front bearing cover are sealed by the oil seal; and the explosion-proof end cover is interference fit with a copper sleeve mounted on the output shaft of the transmission mechanism. The electromagnetic switch, starting relay, and DC series-excited motor in the present application are all installed in an explosion-proof casing, and the explosion-proof casing adopts a completely sealed structure, which can prevent external combustible dust and conductive dust from entering the interior of the casing. At the same time, it can prevent the explosion flame of the explosive gas mixture from being transmitted to the outside through the gaps between the rotating parts when the starter motor is working, thereby detonating the external explosive gas. It has dust-proof and explosion-proof functions, thereby meeting the performance requirements of explosion-proof forklifts for safe operation in gas and dust hazardous environments. In addition, the DC series-excited motor, electromagnetic switch, and starting relay in the present application all adopt a two-wire control structure, which eliminates the safety hazards of the traditional negative pole grounding structure, further improves the safety of vehicle operation, and has a significant explosion-proof effect.

[0019] In addition, the present invention also provides an explosion-proof forklift, including the above-mentioned explosion-proof starter motor. Due to the above-mentioned explosion-proof starter motor, the explosion-proof forklift has the same driving performance as an ordinary forklift, and has excellent explosion-proof performance that can operate safely in a dangerous environment of explosive gas and / or combustible dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of an explosion-proof starter motor for an explosion-proof forklift provided by the present invention;

[0022] Figure 2 This is an electrical schematic diagram of the explosion-proof starter motor for an explosion-proof forklift provided by the present invention.

[0023] Among them, 1-explosion-proof end cover, 2-explosion-proof housing, 3-first sealing ring, 4-front bearing cover, 5-oil seal, 6-second sealing ring, 7-transmission mechanism, 8-DC series-excited motor, 9-electromagnetic switch, 10-starting relay, 11-first explosion-proof connector, 12-copper sleeve, 13-shift fork, 14-negative plate, 15-insulating pad, 16-insulating sleeve, 17-leakage detection module, 18-controller. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Please refer to Figure 1 , Figure 1 This is a schematic structural diagram of an explosion-proof starter motor for an explosion-proof forklift provided by the present invention.

[0026] The present invention provides an explosion-proof starter motor for an explosion-proof forklift, which mainly includes a motor body, wherein the motor body includes a transmission mechanism 7, a DC series-excited motor 8, an electromagnetic switch 9, a starting relay 10, a negative plate 14, a shift fork 13 and a bolt assembly; in addition, the present application also includes an explosion-proof shell 2 and an explosion-proof end cover 1, wherein the explosion-proof shell 2 and the explosion-proof end cover 1 are both provided with an inner cavity for installing the motor body, and a stopper structure is provided at a connection portion between the explosion-proof shell 2 and the explosion-proof end cover 1, wherein the stopper structure can be a step surface or an inwardly concave step structure, and the stopper is provided with a first groove body, and a first sealing ring 3 is provided in the first groove body, and the explosion-proof shell 2 and the explosion-proof end cover 1 are sealed by the cooperation of the first sealing ring 3 and the stopper and then locked and connected by bolts. In addition, an installation cavity is provided at the center of the explosion-proof end cover 1 for the transmission mechanism 7 of the motor body to extend out; a front bearing cover 4 is provided on the explosion-proof end cover 1, a threaded hole is provided at the center of the explosion-proof end cover 1, the front bearing cover 4 is threadedly connected to the explosion-proof end cover 1, an oil seal hole is provided on the front bearing cover 4, an oil seal 5 is installed in the oil seal hole, the explosion-proof end cover 1 is provided with a second groove body, the second groove body is installed with a second sealing ring 6, and the oil seal 5 and the second sealing ring 6 can realize the sealed installation of the front bearing cover 4 and the explosion-proof end cover 1.

[0027] In addition, the explosion-proof end cover 1 is interference-fitted with the copper sleeve 12 sleeved on the output shaft of the transmission mechanism 7. The center hole of the explosion-proof end cover 1 is pressed into the copper sleeve 12 in an interference-fit manner, and the output shaft of the transmission mechanism 7 is sleeved into the copper sleeve 12. Preferably, the gap between the copper sleeve 12 and the transmission mechanism 7 is less than 0.2 mm, and the length of the gap is between 12.5 mm and 30 mm. The transmission mechanism 7 is provided with a slide groove and a fork 13 to cooperate with each other to control the transmission mechanism 7 to engage or disengage with the starter motor gear ring. The other end of the fork 13 cooperates with the electromagnetic switch 9, and the electromagnetic switch 9 controls the position of the fork 13. The starter relay 10 controls the electromagnetic switch 9, and the DC series-excited motor 8 drives the intermediate shaft through the gear to drive the transmission mechanism 7 to operate; in addition, the DC series-excited motor 8, the electromagnetic switch 9 and the starter relay 10 are all double-wire structures, which eliminates the safety hazards of the traditional single-wire structure; two first explosion-proof connectors 11 are installed on the explosion-proof housing 2 to safely lead out the positive and negative shielded cables of the motor respectively.

[0028] The explosion-proof starter motor for explosion-proof forklifts provided in the present application comprises an explosion-proof housing 2 for installing the motor body, an explosion-proof end cover 1 and a front bearing cover 4 which adopt an O-ring and an oil seal 5 to form a completely sealed structure, which can prevent external combustible dust and conductive dust from entering the interior of the housing, and prevent the explosion flame of the explosive gas mixture inside the housing from being transmitted to the outside through the gaps between the rotating parts, thereby detonating the external explosive gas. Even if an explosion occurs during the operation of the motor body, the housing can still completely isolate the explosion source inside the housing, thereby ensuring that the vehicle body can operate normally in both gas and dust hazardous environments. The present application can achieve the explosion-proof function using an ordinary starter motor, thereby meeting the safety operation requirements of explosion-proof internal combustion forklifts.

[0029] The present application can isolate the electric sparks inside the explosion-proof housing 2 when the vehicle body is operating normally, and eliminate the static electricity of the entire vehicle, thus completely avoiding dangerous situations such as electric sparks caused by electrical component failure and static electricity accumulation.

[0030] Preferably, the above-mentioned explosion-proof housing 2 and explosion-proof end cover 1 are both made of aluminum, and the overall safety of the housing can be improved by utilizing its high strength and good explosion-proof performance. In addition, for the convenience of processing, installation and disassembly, the above-mentioned explosion-proof joint is threadedly connected to the explosion-proof housing 2. To ensure the firmness of the installation of the explosion-proof joint, its screw-in depth should be no less than 8mm, and the number of engagement buckles should be greater than 6. In addition, it should be ensured that the gap between the explosion-proof housing 2 and the explosion-proof end cover 1 is less than 0.2mm, and the length of the gap is between 12.5mm and 30mm to ensure good sealing.

[0031] On the basis of the above embodiment, in order to prevent the negative plate 14 inside the DC series-excited motor 8 from contacting the explosion-proof end cover 1, an insulating pad 15 can be arranged between the negative plate 14 and the explosion-proof end cover 1. Since the negative plate 14 is fixed to the explosion-proof end cover 1 by screws, an insulating sleeve 16 can be mounted on the screws, thereby leading out the negative cable of the starter motor separately through the negative plate 14, the insulating pad 15 and the insulating sleeve 16, and effectively isolating the negative plate 14 from the explosion-proof end cover 1 by the insulating pad 15 and the insulating sleeve 16, thereby further improving the safety performance.

[0032] Since the starter motors on explosion-proof forklifts on the market are mostly planetary gear structures, the installation gap between the engine and the starter motor is narrow, and the planetary gear structure makes the transmission mechanism 7 and the DC series-excited motor 8 coaxially arranged. If the explosion-proof requirements of the starter motor are to be met, a flameproof and explosion-proof method must be adopted. However, the gap between the engine and the starter motor is narrow, and it is difficult to design the starter motor housing without avoiding the engine housing.

[0033] In order to further solve the above technical problems, in this embodiment, the gear assembly in the above-mentioned transmission mechanism 7 adopts an external meshing structure. Specifically, the gear assembly includes a clutch gear and a motor gear. The clutch gear is installed on the one-way clutch of the transmission mechanism 7, and the motor gear is installed on the DC series-excited motor 8, and the clutch gear is externally meshed with the motor gear. Such an arrangement avoids the problem of too small installation clearance caused by the coaxial arrangement of the DC series-excited motor 8 and the clutch gear, increases the distance between the engine and the starter motor, and solves the problem of narrow installation clearance between the engine and the starter motor.

[0034] At present, most of the starting motors on the market are mechanically controlled, and they cannot realize automatic intelligent detection of the safety performance of the whole explosion-proof forklift. Therefore, in order to solve this problem, in this embodiment, an automatic leakage detection function is further set. Specifically, an explosion-proof box is provided on the frame, and the explosion-proof box is connected to the starting relay 10 through a relay cable. A second explosion-proof connector is provided at the rear end of the explosion-proof housing 2 for the relay cable to extend, thereby finally controlling the operation of the DC series-excited motor 8. A starting module, a leakage detection module 17 and a neutral start protection module are provided inside the explosion-proof box. The starting module is electrically connected to the leakage detection module 17, and the neutral start protection module is electrically connected to the leakage detection module 17 and the starting relay 10. The leakage detection module 17 is used to detect whether the circuit is leaking: when the leakage detection module 17 detects that the circuit is leaking, the circuit of the neutral start protection module is in an open circuit state, thereby cutting off the power to the relay coil and preventing the DC series-excited motor 8 from starting normally; when the leakage detection module 17 does not detect that the circuit is leaking, the neutral start protection module is turned on, thereby turning on the relay coil, so that the DC series-excited motor 8 can be started.

[0035] Please refer to Figure 2 , Figure 2This is an electrical schematic diagram of the explosion-proof starter motor for an explosion-proof forklift provided by the present invention.

[0036] The starting module in the explosion-proof box includes: a relay K1 and a relay K2, a first end of the coil of the relay K1 is connected to the running gear, a first end of the coil of the relay K2 is connected to the starting gear, a first end of the switch of the relay K1 is connected to the key gear, a second end of the switch of the relay K1 is connected to the neutral start protection module, and a second end of the coil of the relay K1 is connected to the second end of the coil of the relay K2 as the output end of the starting module.

[0037] The neutral start protection module in the explosion-proof box includes: relay K3, fuse F8, controller 18, reverse gear switch K6 and forward gear switch K7. Among them, the coil of relay K3 is connected in series with the leakage detection module 17 to form a first branch, the switch of relay K3 is connected in series with the fuse F8 and the switch of relay K2 to form a second branch, the first branch is connected in parallel with the second branch, the first common end of the parallel circuit is connected to the second end of the coil of relay K1, the second common end is connected to the controller 18, the first end of the relay coil K11 is connected to the output end, the second end of the relay coil K11 is connected to the controller 18, and the controller 18 is also connected to the reverse gear switch K6 and the forward gear switch K7. The leakage detection module 17 is a prior art.

[0038] When the power-off switch Q1 is closed, the power supply circuit is connected, the preheating start switch QK is opened to the running gear, the coil of the relay K1 is energized, thereby controlling the switch of the relay K1 to close, and the leakage detection module 17 detects whether the circuit has leakage. If the detection result shows leakage, the coil of the relay K3 is blocked, the switch of the relay K3 is in the disconnected state, the neutral start protection module including the controller 18 and the coil of the relay K3 cannot be turned on, the DC series-excited motor 8 cannot work, and the motor body cannot be started. At this time, the circuit is in the leakage protection state; when the detection result of the leakage detection module 17 shows that there is no leakage in the circuit, the coil of the relay K3 is energized, and the relay K3 is controlled. 3 is closed. When there is no input signal for the forward and reverse gears, the forward gear switch K7 and the reverse gear switch K6 are both in the disconnected state. At this time, the vehicle is in the neutral state. When the preheating start switch QK is opened to the starting gear, the coil of the relay K2 is energized, the switch of the control relay K2 is closed, and the controller starts to work, thereby making the relay coil K11 energized, controlling the relay switch K11 to close, and transmitting the signal to the starter relay 10, so that the starter motor gets the starting current and starts working; when a short circuit occurs in the circuit, the fuse F1 will play a role in protecting the vehicle from current overload, protecting the circuit components of the vehicle from being burned, and the fuse F9 protects the starter motor starting control circuit. In this way, the starting control and leakage protection of the starter motor are realized, and the operating safety performance of the explosion-proof whole system is improved.

[0039] From the perspective of improving the safety performance of the explosion-proof box, it is preferred that the body of the explosion-proof box is made of explosion-proof materials such as aluminum, or made of insulating plastic, to further eliminate static electricity in the entire vehicle, completely avoid the dangerous situation of electric sparks caused by electrical component failure and static electricity accumulation, and ensure the safe operation of the vehicle.

[0040] In addition, the present invention also provides an explosion-proof forklift, including the above-mentioned explosion-proof starting motor, to ensure that when operating in a dangerous environment, the explosion-proof forklift can work continuously and safely like an ordinary forklift, thereby reducing the maintenance frequency and operating costs, and having significant explosion-proof performance.

[0041] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0042] The above is a detailed introduction to the explosion-proof forklift and the explosion-proof starter motor for the explosion-proof forklift provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An explosion-proof starter motor for an explosion-proof forklift, comprising a transmission mechanism (7), a DC series-excited motor (8), an electromagnetic switch (9) and a starter relay (10), characterized in that: It also includes an explosion-proof shell (2) and an explosion-proof end cover (1), wherein the connection portion of the explosion-proof shell (2) is provided with a stopper, the stopper is provided with a first groove, the first groove is provided with a first sealing ring (3), the explosion-proof shell (2) and the explosion-proof end cover (1) are positioned and connected with bolts through the stopper; the explosion-proof end cover (1) is provided with an installation cavity for the transmission mechanism (7) to pass through; and it also includes a front bearing cover (4) threadedly matched with the explosion-proof end cover (1), the front bearing cover (4) being provided with an oil seal hole , an oil seal (5) is installed in the oil seal hole, the explosion-proof end cover (1) is provided with a second slot body, and the second slot body is provided with a second sealing ring (6); the explosion-proof end cover (1) is interference-fitted with a copper sleeve (12) sleeved on the output shaft of the transmission mechanism (7); the DC series-excited motor (8), the electromagnetic switch (9) and the starting relay (10) are all of a two-wire structure, and the explosion-proof housing (2) is provided with two first explosion-proof connectors (11) for respectively leading out the positive and negative shielded cables of the motor; It also includes an insulating pad (15) for isolating the negative plate (14) inside the DC series-excited motor (8) from the explosion-proof end cover (1); the negative plate (14) is fixed to the explosion-proof end cover (1) by screws, and the screws are covered with an insulating sleeve (16) for insulating the explosion-proof end cover (1) from the negative plate (14); The gear assembly in the transmission mechanism (7) adopts an external meshing structure; The gear assembly comprises a clutch gear connected to the one-way clutch and a motor gear connected to the DC series-excited motor (8), the clutch gear being externally meshed with the motor gear; The transmission mechanism (7) is provided with a sliding groove that cooperates with a shift fork (13) to control the transmission mechanism (7) to engage or disengage with the starter motor gear ring. The other end of the shift fork (13) cooperates with the electromagnetic switch (9). The electromagnetic switch (9) controls the position of the shift fork (13). The starter relay (10) controls the electromagnetic switch (9). The DC series-excited motor (8) drives the intermediate shaft through the gears to drive the transmission mechanism (7) to operate.

2. The explosion-proof starter motor for an explosion-proof forklift according to claim 1, characterized in that: The explosion-proof housing (2) and the explosion-proof end cover (1) are both made of aluminum.

3. The explosion-proof starter motor for an explosion-proof forklift according to claim 2, characterized in that: The first explosion-proof joint (11) is threadedly connected to the explosion-proof housing (2), and the screwing depth of the first explosion-proof joint (11) is not less than 8 mm, and the number of engagement buckles is greater than 6.

4. The explosion-proof starter motor for an explosion-proof forklift according to claim 3, characterized in that: The gap between the explosion-proof housing (2) and the explosion-proof end cover (1) is less than 0.2 mm, and the length of the gap is between 12.5 mm and 30 mm.

5. The explosion-proof starter motor for an explosion-proof forklift according to any one of claims 1 to 4, characterized in that: It also includes an explosion-proof box installed on the vehicle frame, wherein the explosion-proof box is connected to the starting relay (10) through a relay wire to control the operation of the DC series-excited motor (8); The explosion-proof box is provided with a starting module, a leakage detection module (17) and a neutral start protection module. The starting module is electrically connected to the leakage detection module (17), and the neutral start protection module is electrically connected to the leakage detection module (17) and the starting relay (10). The leakage detection module (17) is used to detect whether the circuit has leakage. When the leakage detection module (17) detects that the circuit has leakage, the circuit of the neutral start protection module is disconnected, thereby cutting off the power to the coil of the starting relay (10), and the DC series-excited motor (8) does not work. When the leakage detection module (17) does not detect that the circuit has leakage, the neutral start protection module is connected, thereby connecting the coil of the starting relay (10), and the DC series-excited motor (8) is started.

6. The explosion-proof starter motor for an explosion-proof forklift according to claim 5, characterized in that: The starting module comprises: a relay K1 and a relay K2, wherein the first end of the coil of the relay K1 is connected to the running gear, the first end of the coil of the relay K2 is connected to the starting gear, the first end of the switch of the relay K1 is connected to the key gear, and the second end of the switch of the relay K1 is connected to the neutral start protection module; the second end of the coil of the relay K1 is connected to the second end of the relay K2 as the output end of the starting module; The neutral start protection module comprises a relay K3, a fuse F8, a controller (18), a reverse gear switch K6 and a forward gear switch K7; The coil of the relay K3 is connected in series with the leakage detection module (17) to form a first branch, the switch of the relay K3 is connected in series with the fuse F8 and the switch of the relay K2 to form a second branch, the first branch is connected in parallel with the second branch, and the first common end is connected to the second end of the coil of the relay K1, and the second common end is connected to the controller (18), the first end of the coil of the starter relay (10) is connected to the output end, the second end of the coil of the starter relay (10) is connected to the controller (18), and the controller (18) is also connected to the reverse gear switch K6 and the forward gear switch K7.

7. The explosion-proof starter motor for an explosion-proof forklift according to claim 6, characterized in that: The box body of the explosion-proof box is made of aluminum.

8. An explosion-proof forklift, characterized in that: The invention comprises an explosion-proof starter motor for an explosion-proof forklift according to any one of claims 1 to 7.

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