Motor thermal protection device for coal mine scraper conveyor

Abstract

A motor thermal protection device for a coal mine scraper conveyor comprises a cooling mechanism, a water storage tank and an air source, the cooling mechanism comprises two mounting pads, the two mounting pads are connected through a plurality of connecting ropes to form a heat dissipation sleeve capable of being arranged on a motor in a sleeving mode, and cooling water pipes are arranged on the mounting pads. The cooling water pipes are distributed in an S shape and attached to a shell of the motor, the two cooling water pipes are communicated with each other and form a cooling water path surrounding the motor, the cooling water path is communicated with the water storage tank through the coil pipe, and an air outlet of the air source faces the coil pipe. According to the utility model, the structure is simple, and only the mounting pad needs to be connected through the connecting rope and then sleeved on the motor, so that the mounting pad can be combined with the existing motor no matter what type of motor is, and a new motor does not need to be purchased additionally. And after installation, the device can be directly put into use without shutdown debugging, so that the use cost and the production stagnation risk caused by equipment replacement are reduced.

Description

Technical Field

[0001] This utility model relates to the field of underground motor overheat protection technology, specifically a thermal protection device for the motor of a coal mine scraper conveyor. Background Technology

[0002] Scraper conveyors are common material handling equipment in coal mines, mainly composed of a frame, rollers, scrapers, chains, electric motors, and reducers. Among these, the electric motor, as the core power component, often operates for extended periods in harsh environments and is prone to overheating due to factors such as large load fluctuations, high ambient temperatures, and high dust levels. Overheating not only reduces operating efficiency but can also lead to insulation aging, bearing damage, and even serious consequences such as motor burnout.

[0003] To prevent electric motors from being damaged by overheating, some specialized electric motors have their own cooling system. These motors have coolant flow channels designed around their casing or internal windings, and are equipped with coolant, coolant pipes, radiators, and water pumps to form a water-cooled circulation system. However, the cost of a single such motor is relatively high, and coal mines have a large demand for electric motors. Replacing the entire system would not only be costly but could also lead to downtime for debugging, thereby affecting the normal production of the coal mine. Utility Model Content

[0004] To address the issue of high replacement costs for some dedicated electric motors in existing technologies, this utility model provides a thermal protection device for the electric motor of a coal mine scraper conveyor, which reduces the cost of replacing the heat dissipation structure.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a thermal protection device for an electric motor of a coal mine scraper conveyor, including a cooling mechanism, a water storage tank and an air source. The cooling mechanism includes two mounting pads, which are connected by several connecting ropes to form a heat dissipation sleeve that can be fitted onto the electric motor. Cooling water pipes are provided on the mounting pads, and the cooling water pipes are distributed in an S-shape and attached to the housing of the electric motor. The two cooling water pipes are interconnected and form a cooling water path around the electric motor. The cooling water path is connected to the water storage tank through a coil, and the air outlet of the air source faces the coil.

[0006] As a further optimization of the thermal protection device for the motor of a coal mine scraper conveyor, the mounting pad is provided with multiple sets of limiting members, each set of limiting members is set to multiple, and the limiting members in the same set are distributed in a straight line. A channel for cooling water pipes to pass through is formed between two adjacent limiting members in the same set. The cooling water pipes pass through all the channels in sequence to form an S-shape and contact the motor housing.

[0007] As a further optimization of the utility model kind of coal mine scraper conveyor motor heat protection device: the limiting piece includes fixedly connected limiting strip and anti-off strip, limiting strip is fixedly arranged on the mounting pad, and the anti-off strip is parallel with the mounting pad, the cooling water pipe can pass through between the anti-off strip and the mounting pad.

[0008] As a further optimization of the utility model kind of coal mine scraper conveyor motor heat protection device: the limiting strip and the anti-off strip are provided with the arc surface that can be attached with the surface of the motor.

[0009] As a further optimization of the utility model kind of coal mine scraper conveyor motor heat protection device: two cooling water pipes are connected through the conveying assembly to form the cooling water path, one end of the cooling water path is communicated with the first joint of the water storage tank, and the other end of the cooling water path is communicated with the inlet of the coil pipe.

[0010] As a further optimization of the utility model kind of coal mine scraper conveyor motor heat protection device: the conveying assembly includes two conveying joints corresponding to the cooling water pipe, and the two conveying joints are fixedly connected through the fixing piece after being inserted.

[0011] As a further optimization of the utility model kind of coal mine scraper conveyor motor heat protection device: the fixing piece includes a clamping pipe, a notch extending along the axial direction is formed on the surface of the clamping pipe, clamping plates are fixedly connected on both sides of the notch, and the two clamping plates are fixedly connected through connecting bolts.

[0012] As a further optimization of the utility model kind of coal mine scraper conveyor motor heat protection device: one of the conveying joints has a reduced diameter portion, the reduced diameter portion is inserted into the other conveying joint, and a sealing pad is sleeved on the surface of the reduced diameter portion.

[0013] As a further optimization of the utility model kind of coal mine scraper conveyor motor heat protection device: the mounting pad is provided with a mounting block, and a through hole for the connecting rope to pass through is formed in the mounting block.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The utility model discloses a set up two installation pads, and the two installation pads are connected through a plurality of connecting ropes to form a heat dissipation sleeve that can be sleeved on the motor, the installation pad is provided with a mounting block, and a through hole for the connecting rope to pass through is formed in the mounting block, the installation pad is provided with a cooling water pipe, and the cooling water pipe is distributed in an S shape and is attached to the casing of the motor, the S-shaped cooling water pipe increases the contact area between the cooling water pipe and the motor, ensures the heat dissipation effect, and the cooling water pipe can be contacted with the motor through the adjustment of the connecting rope, the utility model discloses simple structure, only needs to be sleeved on the motor through the connecting rope after connecting the installation pad, the installation pad of the utility model discloses can be combined with the existing motor, and a new motor does not need to be additionally purchased, and after installation, no need to stop debugging, can be directly put into use, thereby reduce the use cost and the production stagnation risk brought by equipment replacement. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structural schematic diagram of the utility model discloses;

[0017] Figure 2 It is the installation schematic diagram of the utility model discloses;

[0018] Figure 3 It is the distribution schematic diagram of limiting piece on installation pad;

[0019] Figure 4 It is the connecting schematic diagram of water storage tank and coil pipe;

[0020] Figure 5 It is the schematic diagram of two delivery connectors;

[0021] Figure 6 It is the insertion schematic diagram of delivery connector;

[0022] Figure 7 It is the cooperation schematic diagram of delivery connector and fixing piece;

[0023] Figure 8 It is the circuit connection schematic diagram;

[0024] Mark in drawing: 1, motor, 2, installation pad, 3, delivery connector, 4, mounting block, 5, water inlet connector, 6, water outlet connector, 7, connecting rope, 8, cooling water pipe, 9, limiting strip, 10, anti -drop strip, 11, arc surface, 12, passageway, 13, anti -drop space, 14, water storage tank, 15, first connector, 16, second connector, 17, coil pipe, 18, outlet, 19, import, 20, reduced diameter portion, 21, pipe clamp, 22, clamping plate, 23, connecting bolt. DETAILED DESCRIPTION

[0025] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. Parts not described or disclosed in detail in the following embodiments of this utility model should be understood as prior art known or should be known by those skilled in the art, such as the structure and model of the motor 1, the material and model of the conveying connector 3, the water inlet connector 5, the water outlet connector 6, the first connector 15 and the second connector 16, the material and model of the cooling water pipe 8, the material of the coil 17, the selection of the coolant, the model of the fan, the model and working principle of the water pump, and the model of the water storage tank 14, etc.

[0026] Example 1

[0027] A thermal protection device for the electric motor of a coal mine scraper conveyor, such as Figures 1 to 4 As shown, the device includes a cooling mechanism, a water tank 14, and an air source. The cooling mechanism includes two mounting pads 2, which are rectangular and made of an elastic material. The specific material used is conventional and existing in the field, and will not be described in detail here. The two mounting pads 2 are connected by several connecting ropes 7 to form a heat dissipation sleeve that can be fitted onto the motor 1. The mounting pads 2 are provided with mounting blocks 4, which have through holes for the connecting ropes 7 to pass through. One end of the connecting rope 7 passes through the through hole on one of the mounting blocks 4 and is tied tightly. The other end of the connecting rope 7 is adjusted according to the distance between the two mounting pads 2 and extends into the through hole on the other mounting block 4 and is tied tightly. Cooling water pipes 8 are provided on the mounting pads 2, and the cooling water pipes 8 are distributed in an S-shape and attached to the housing of the motor 1. The S-shaped distribution of the cooling water pipes 8 increases the contact area between the cooling water pipes 8 and the motor 1, ensuring the heat dissipation effect. The cooling water pipes 8 can be in contact with the motor 1 by adjusting the connecting ropes 7. Two cooling water pipes 8 are interconnected and form a cooling water circuit surrounding the motor 1. The cooling water circuit is connected to the water storage tank 14 via the coil 17. A water pump is installed on the water storage tank 14 to ensure the circulation of the cooling water circuit. The air outlet of the air source faces the coil 17 to cool the coil 17 and ensure the heat dissipation of the coolant in the cooling water circuit. The air source can be a fan, or it can rely on the air intake or return shaft in the coal mine. It can be flexibly selected according to the actual situation. The air intake and return shafts are conventional existing technologies in this field and will not be described in detail here.

[0028] The mounting pad 2, connecting rope 7, cooling water pipe 8, water storage tank 14, coil 17, and air source of this utility model work together to cool the motor 1. The structure is simple; the mounting pad 2 is simply connected via the connecting rope 7 and then fitted onto the motor 1. The mounting pad 2 of this utility model can be integrated with existing motors 1, eliminating the need to purchase a new motor 1 and reducing operating costs.

[0029] The above are the basic embodiments of this utility model. Further improvements, optimizations, and limitations can be made based on the above to obtain the following embodiments:

[0030] Embodiment 2

[0031] This embodiment is an improved scheme based on embodiment 1, and the main structure is the same as embodiment 1, and the improvement point is that, as shown in Figure 2 and Figure 3 In order to quickly distribute the cooling water pipe 8 in the S shape on the installation pad 2, a plurality of sets of limiting pieces are arranged on the installation pad 2, the number of limiting pieces in one set is set to be multiple, and the limiting pieces in the same set are distributed along a straight line. The adjacent two limiting pieces in the same set form a channel 12 for the cooling water pipe 8 to pass through. A part of the cooling water pipe 8 will be higher than the channel 12, so as to ensure that the cooling water pipe 8 can be in contact with the surface of the motor 1. The cooling water pipe 8 passes through all the channels 12 in sequence to form an S shape and is in contact with the shell of the motor 1. In order to avoid the cooling water pipe 8 from falling off from the channel 12, the limiting piece includes a limiting strip 9 and an anti-falling strip 10 fixedly connected. The limiting strip 9 is fixedly arranged on the installation pad 2, and the anti-falling strip 10 is parallel to the installation pad 2. The anti-falling strip 10 can be integrally connected with the installation pad 2. The anti-falling space 13 is formed between the anti-falling strip 10 and the installation pad 2. The cooling water pipe 8 can pass through between the anti-falling strip 10 and the installation pad 2 and be limited in the anti-falling space 13. Alternatively, only the limiting strip 9 is installed. The width of the channel 12 formed between the adjacent limiting strips 9 in the same set can be appropriately smaller than the outer diameter of the cooling water pipe 8. In this way, the cooling water pipe 8 is inserted into the channel 12 and deformed under the extrusion of the limiting strip 9, so as to avoid the cooling water pipe 8 from falling off from the channel 12.

[0032] Embodiment 3

[0033] This embodiment is an improved scheme based on embodiment 2, and the main structure is the same as embodiment 2, and the improvement point is that, as shown in Figure 3 When the installation pad 2 and the cooling water pipe 8 are installed on the motor 1, the installation pad 2 will be bent to a certain extent, and at the same time, the connecting rope 7 will tie the installation pad 2 tightly on the surface of the motor 1, so that the installation pad 2 deforms to a certain extent together with the cooling water pipe 8. In order to ensure that the limiting strip 9 and the anti-falling strip 10 can better contact the surface of the motor 1 during this process, the limiting strip 9 and the anti-falling strip 10 are both provided with an arc surface 11 which can be attached to the surface of the motor 1.

[0034] Embodiment 4

[0035] This embodiment is an improved scheme based on embodiment 1, and the main structure is the same as embodiment 1, and the improvement point is that, as shown in Figure 1 and Figure 4As shown, two said cooling water pipes 8 are connected by a conveying assembly to form said cooling water path, one end of the cooling water path is communicated with the first joint 15 of said water storage tank 14, and a water pump is arranged at the first joint 15, the other end of the cooling water path is communicated with the inlet 19 of said coil pipe 17. One of the cooling water pipes 8 has a water inlet joint 5, and the other cooling water pipe 8 has a water outlet joint 6, the water inlet joint 5 is communicated with the first joint 15, and the water outlet joint 6 is communicated with the inlet 19 of the coil pipe 17, and the outlet 18 of the coil pipe 17 is communicated with the second joint 16 of the water storage tank 14. As shown in Figure 1 and Figure 7 As shown, the conveying assembly includes two conveying joints 3 corresponding to said cooling water pipes 8, and the two conveying joints 3 are fixedly connected by a fixing member after being inserted. The specific insertion mode of the two conveying joints 3 is shown in Figure 5 and Figure 6 As shown, one of the conveying joints 3 has a reduced diameter portion 20, the reduced diameter portion 20 is inserted into the other conveying joint 3, and the surface of the reduced diameter portion 20 is sleeved with a sealing gasket to ensure the sealing of the insertion. The fixing member includes a clamping pipe 21, the surface of the clamping pipe 21 is provided with a notch extending along the axial direction of the clamping pipe 21, both sides of the notch are fixedly connected with clamping plates 22, and the two clamping plates 22 are fixedly connected by a connecting bolt 23. The clamping pipe 21 has a certain elasticity, the clamping pipe 21 is clamped at the insertion position of the two connected conveying joints 3 through the notch, and then the two clamping plates 22 are tightly connected by the connecting bolt 23.

[0036] Example 5

[0037] This embodiment is an improved scheme based on example 1, and the main structure is the same as that of example 1, and the improvement lies in: in actual production, the scraper conveyor often rotates unsmoothly or is stuck, which makes the motor 1 have too large load or exceeds the rated current frequently; when the material is transported underground, dust and coal dust are large, and the material is prone to leak into the motor, which reduces the insulation capacity of the motor, thereby reducing the allowable temperature rise of the motor; secondly, the motor 1 fan loses rotation or the fan cap is often blocked, which will overload the motor 1. More than 90% of the motors maintained by the applicant in the coal mine are caused by overcurrent, the output of the motor 1 is increased, or the motor 1 is stuck or the rotating speed is sharply reduced, which makes the current of the motor 1 sharply increase and overheat, and the stator current greatly exceeds the rated current, and the motor 1 overheats and burns out. The motor 1 used by the applicant has good explosion-proof performance, and the outlet of the temperature control system is added without changing the original explosion-proof junction box. The thermosensitive element is a temperature controller using a bimetallic strip as a temperature sensing element. When the electric appliance works normally, the bimetallic strip is in a free state, and the contact is in a closed / open state. When the temperature rises to the action temperature value, the bimetallic element generates internal stress and quickly acts to open / close the contact, thereby cutting off / connecting the circuit, thereby playing a thermal protection role. When the temperature drops to the reset temperature, the contact is automatically closed / opened to restore the normal working state.Figure 8 As shown, the original motor terminal is replaced by a substitute, and the six terminals of the motor 1 are connected internally (changed to star or delta terminals) and then connected to the three terminals of the terminal box of the motor 1, and the remaining three terminals are connected to the temperature control line. A 6-core power cable with a control line and a switch are connected, 12 thermal elements in the motor 1 are all connected in series, and are connected to the 2 line and 9 line of the switch. When the motor 1 is normally running, the thermal elements are connected to the 2 line and 9 line of the switch, and the switch works normally; when one of the thermal elements of the motor 1 detects that the temperature is too high, the thermal element immediately acts, the switch control loop is cut off, and the motor 1 stops working. According to the temperature resistance of the insulation material B of the motor 1 in the mine, the temperature range detected by the thermal element used this time is: 90℃-40℃, when the temperature of the motor 1 is higher than 90℃, the circuit is automatically disconnected, the thermal element has a memory function, and when the temperature does not drop to the set temperature, the motor 1 cannot be started artificially. Only when the temperature of the motor 1 drops to 40℃, the circuit is closed, the thermal element is automatically reset, the thermal protection system circuit is connected, the switch is automatically reset, and the motor 1 can work again. The motor 1 is started and runs.

[0038] When the winding of each phase of the motor 1 after the installation generates heat, it can act in time; the power supply is cut off, and the motor 1 stops running, so as not to be burned out. The motor 1 of the 40T scraper conveyor burned out in the mine is transformed, and the 12 groups of windings of the motor 1 are all equipped with thermal elements, so as to fully detect the temperature of each group of windings, solve the problem of frequent burning of the motor 1, and the thermal elements installed also have a memory function. Only when the temperature drops to the specified range can it run again, so as to protect the motor from being burned out.

[0039] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermal protection device for the electric motor of a coal mine scraper conveyor, characterized in that: The cooling mechanism includes a cooling system, a water tank (14), and an air source. The cooling system includes two mounting pads (2). The two mounting pads (2) are connected by several connecting ropes (7) to form a heat dissipation sleeve that can be fitted onto the motor (1). Cooling water pipes (8) are provided on the mounting pads (2). The cooling water pipes (8) are distributed in an S-shape and attached to the housing of the motor (1). The two cooling water pipes (8) are interconnected and form a cooling water path that surrounds the motor (1). The cooling water path is connected to the water tank (14) through a coil (17). The air outlet of the air source faces the coil (17).

2. The thermal protection device for the electric motor of a coal mine scraper conveyor as described in claim 1, characterized in that: The mounting pad (2) is provided with multiple sets of limiting members. The number of limiting members in a set is set to multiple, and the limiting members in the same set are distributed in a straight line. A channel (12) for the cooling water pipe (8) to pass through is formed between two adjacent limiting members in the same set. The cooling water pipe (8) passes through all the channels (12) in sequence to form an S-shape and contacts the outer shell of the motor (1).

3. The thermal protection device for the electric motor of a coal mine scraper conveyor as described in claim 2, characterized in that: The limiting component includes a limiting strip (9) and an anti-detachment strip (10) that are fixedly connected. The limiting strip (9) is fixedly set on the mounting pad (2), and the anti-detachment strip (10) is parallel to the mounting pad (2). The cooling water pipe (8) can pass between the anti-detachment strip (10) and the mounting pad (2).

4. The thermal protection device for the electric motor of a coal mine scraper conveyor as described in claim 3, characterized in that: Both the limiting strip (9) and the anti-detachment strip (10) are provided with an arc-shaped surface (11) that can fit against the surface of the motor (1).

5. The thermal protection device for the electric motor of a coal mine scraper conveyor as described in claim 1, characterized in that: The two cooling water pipes (8) are connected by a conveying assembly to form the cooling water path. One end of the cooling water path is connected to the first connector (15) of the water storage tank (14), and the other end of the cooling water path is connected to the inlet (19) of the coil (17).

6. The thermal protection device for the electric motor of a coal mine scraper conveyor as described in claim 5, characterized in that: The conveying assembly includes two conveying connectors (3) that are connected to the cooling water pipe (8). The two conveying connectors (3) are inserted and then fixedly connected by fasteners.

7. The thermal protection device for the electric motor of a coal mine scraper conveyor as described in claim 6, characterized in that: The fastener includes a clamp tube (21), the surface of which has a notch extending along its axial direction, and clamp plates (22) are fixedly connected to both sides of the notch, and the two clamp plates (22) are fixedly connected to each other by connecting bolts (23).

8. The thermal protection device for the electric motor of a coal mine scraper conveyor as described in claim 6, characterized in that: One of the conveying joints (3) has a reduced diameter section (20) which is inserted into the other conveying joint (3), and the surface of the reduced diameter section (20) is fitted with a sealing gasket.

9. The thermal protection device for the electric motor of a coal mine scraper conveyor as described in claim 1, characterized in that: The mounting pad (2) is provided with a mounting block (4), and the mounting block (4) has a through hole for the connecting rope (7) to pass through.

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