Tin dispensing pre-positioning tool for temperature sensing line of stator assembly

Abstract

The utility model discloses a stator assembly temperature sensing line tin dotting pre-positioning tool, a stator assembly is installed on a casing, the pre-positioning tool comprises a fixed seat, a tin storage bottom plate is arranged at the bottom of the fixed seat, a main body part of the tin storage bottom plate protrudes out of the fixed seat and is provided with a tin falling groove with a closed bottom, and the tin falling groove is provided with a tin groove. The tin storage bottom plate is detachably installed on a machine shell on the periphery of a stator assembly, two wire harness fixing grooves used for containing temperature sensor sensing wires of the stator assembly are formed in the top of the fixing base, a pressing plate capable of being opened and closed is arranged at the top of the fixing base, and the temperature sensor sensing wires in the wire harness fixing grooves are pressed and fixed through the closed pressing plate. Compared with the prior art, the utility model has the following advantages: the temperature sensor sensing wire in the wire harness fixing groove can be compressed and fixed, so that the temperature sensor sensing wire and the hinged section of the temperature sensor sensing wire and a vehicle connector cable do not displace in the tin soldering process, and an operator can smoothly finish the tin soldering operation at the hinged part of the cable; and the working efficiency of tin dispensing operation and the tin dispensing quality are improved.

Description

Technical Field

[0001] The utility model relates to a motor assembly auxiliary tool, in particular to a stator assembly temperature sensing line point tin pre-positioning tool. Background Art

[0002] At present, the electric drive system is mainly composed of a drive motor, a controller and a reducer. The drive motor mainly includes a casing, a rotor assembly, a stator assembly and a rear end cover. As the core of the drive motor, the stator assembly mainly includes an iron core, a three-phase winding, an insulating plug and a temperature sensor.

[0003] The temperature sensing line is used to detect the real-time workload of the three-phase winding. When the drive motor maintains high-load operation for a long time, the three-phase winding can quickly heat the entire stator assembly through the self-eddy current on the surface of the core. When the working temperature of the stator assembly exceeds the demagnetization temperature of its internal magnets, the internal magnets of the drive motor will quickly demagnetize, causing an irreversible decline in motor performance and efficiency. In order to avoid this situation, the applicant has installed a single or multiple temperature sensors between the three-phase windings to detect the workload of the three-phase windings in real time, ensuring that the entire working condition of the drive motor is within the detectable and controllable range of the controller.

[0004] According to the actual use conditions inside the drive motor, at present, temperature sensors can be roughly divided into two categories: monometallic and bimetallic. Monometallic ones mostly use precious metals such as platinum, palladium, and rhodium as sensor materials, and detect temperature through the linear relationship between temperature and resistance value; bimetallic ones use the inter-electrode voltage difference generated by the current flowing through two different metal materials, and detect temperature through the changing relationship between temperature and inter-electrode voltage difference. The above two types of temperature sensors are both suitable for internal temperature detection of drive motors. From the perspective of cost and reliability, monometallic temperature sensors have higher cost and reliability, while bimetallic temperature sensors are more cost-effective.

[0005] In the manufacturing process of the stator assembly, the temperature sensor is installed in the three-phase winding after the wire is embedded and shaped. In the process, it is cured together with the three-phase winding by dripping or dipping paint. The extended positive and negative sensor wires also need to be transferred to the vehicle connector to be compatible with the electric drive controller. In order to solve the transfer problem, the following two assembly processes are currently used in production sites: one is the terminal solution, that is, the positive and negative sensor terminals of the temperature sensor wire are crimped, and the transfer with the vehicle adapter is completed by plugging the male and female terminals. This solution has extremely high assembly efficiency, but the male and female terminals have complex structural molding and high costs, so they are only used in the field of high-end electric drives; the other is the spot tinning solution, that is, the cables between the temperature sensor and the vehicle connector are fixed with twisted wire + spot tinning, and the exposed parts of the twisted wire are sealed with PVC heat shrink tubes. This solution has low assembly efficiency, but because the procurement cost of the temperature sensor and the vehicle connector is extremely low and the reliability of use is high, it is widely used in the field of mid- and low-end electric drives.

[0006] At present, the operation of the tinning solution is mostly done manually by on-site workers. The operator first twists the end of the temperature sensor line with the end of the cable of the vehicle connector to form a twisted section, and then tins the twisted section. During the tinning process, the operator holds the welding gun in one hand and the tin wire in the other hand. There is no other hand free to pre-fix the cable with the tinning, so the twisted section is prone to displacement, resulting in problems such as long tinning time, uneven tinning and wrong tinning position, which affects the tinning quality and operation efficiency. Utility Model Content

[0007] The utility model aims to overcome the deficiencies of the prior art and provides a stator assembly temperature sensing line spot tinning pre-positioning tool to achieve spot tinning pre-fixation of the stator assembly temperature sensing line to ensure that the temperature sensing line does not move during the spot tinning process.

[0008] The utility model is realized by the following technical solutions:

[0009] A stator assembly temperature sensing line tin point pre-positioning tool, the stator assembly is installed on a casing, the pre-positioning tool comprises a fixing seat, a tin storage bottom plate is provided at the bottom of the fixing seat, the main part of the tin storage bottom plate protrudes from the fixing seat and is provided with a tin drop groove with a closed bottom, the tin storage bottom plate is detachably mounted on the casing outside the stator assembly, two harness fixing grooves for placing the temperature sensor wire of the stator assembly are provided on the top of the fixing seat, an opening and closing pressure plate is provided on the top of the fixing seat, and the temperature sensor wire in the harness fixing groove is pressed and fixed by the closed pressure plate.

[0010] As a preferred solution of the above-mentioned pre-positioning tooling, the pressing plate and the top of the fixing seat are adsorbed together by magnetic attraction.

[0011] As a preferred solution of the above-mentioned pre-positioning tooling, the pressing plate is a magnetic steel plate, and a magnetic steel is embedded on the top of the fixing seat, and the closing between the pressing plate and the fixing seat is achieved by the magnetic attraction between the magnetic steel plate and the magnetic steel.

[0012] As a preferred solution of the above-mentioned pre-positioning tooling, one end of the pressing plate is hinged on the fixing seat and the other end is a free end.

[0013] As a preferred solution of the above-mentioned pre-positioning tooling, the casing is provided with a mounting end face at a portion located on the periphery of the stator assembly, and a threaded bottom hole is opened on the mounting end face of the casing. Two locating pins are provided on the tin storage bottom plate, and the rods of the two locating pins extend downward from the bottom of the tin storage bottom plate. The two locating pins cooperate with the two threaded bottom holes on the mounting end face of the casing, and at the same time, the bottom surface of the tin storage bottom plate fits with the mounting end face of the casing, thereby realizing the positioning and installation of the tin storage bottom plate on the casing.

[0014] As a preferred solution for the above-mentioned pre-positioning tooling, two locating pin mounting holes are opened on the tin storage bottom plate, the press-fit ends of the two locating pins are respectively interference fitted with the two locating pin mounting holes, and the rods at the bottom of the two locating pins extend downward from the bottom of the two locating pin mounting holes.

[0015] As a preferred solution of the above-mentioned pre-positioning tooling, the fixing seat is located at the periphery of the stator assembly, and the fixing seat is an arc-shaped seat arranged concentrically with the stator assembly.

[0016] As a preferred solution of the above-mentioned pre-positioning tooling, a sunken avoidance groove is opened on the top of the fixing seat at one end close to the free end of the pressing plate, and the free end of the pressing plate in the closed state is cantilevered over the avoidance groove.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The utility model provides a stator assembly temperature sensing line spot tinning pre-positioning tool, which is installed on a casing outside the stator assembly. The pre-positioning tool cooperates with a pressure plate that can be opened and closed through a wire harness fixing groove on the top of a fixing seat to achieve compression and fixation of the temperature sensor sensing line in the wire harness fixing groove, ensuring that the temperature sensor sensing line and the twisted section with the vehicle connector cable line do not move during the spot tinning welding process, so that the operator can smoothly complete the spot tinning operation at the cable twisting point, ensuring the uniformity of the spot tinning, preventing the occurrence of a circuit break at the cable twisting point to cause an unexpected fault alarm, improving the work efficiency and quality of the spot tinning operation, and ensuring the production efficiency under mass production conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the pressing plate of the utility model in a closed state.

[0020] Figure 2 It is a structural schematic diagram of the utility model in an open state of the pressing plate.

[0021] Figure 3 It is a top view of the tin storage bottom plate of the utility model.

[0022] Figure 4 It is a front view of the positioning pin of the utility model.

[0023] Figure 5 It is a structural schematic diagram of the working state of the utility model.

[0024] Numbers in the figure: 1 stator assembly; 2 housing; 3 fixing seat; 4 tin storage bottom plate; 5 tin drop groove; 6 installation end surface; 7 positioning pin; 8 positioning pin installation hole; 9 press-fit end; 10 wiring harness fixing groove; 11 pressure plate; 12 hinge; 13 avoidance groove; 14 magnet. DETAILED DESCRIPTION

[0025] The following is a detailed description of an embodiment of the utility model. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific operation process are given, but the protection scope of the utility model is not limited to the following embodiment.

[0026] See also Figures 1 to 5 This embodiment discloses a stator assembly temperature sensing line spot tin pre-positioning tool. The stator assembly 1 is mounted on the casing 2. The pre-positioning tool includes a fixing seat 3. A tin storage base plate 4 is provided at the bottom of the fixing seat 3. The fixing seat 3 and the tin storage base plate 4 can be fixed together by screw connection. The main body of the tin storage base plate 4 protrudes from the fixing seat 3 and is provided with a tin drop groove 5 with a closed bottom. The tin drop groove 5 is used to receive the excess tin material dropped during the spot tin welding process. The tin storage base plate 4 is detachably mounted on the casing 2 outside the stator assembly 1. The housing 2 is provided with a mounting end face 6 at the location located at the periphery of the stator assembly 1, and a threaded bottom hole is provided on the mounting end face 6 of the housing 2. Two locating pins 7 are provided on the tin storage bottom plate 4, and the rods of the two locating pins 7 extend downward from the bottom of the tin storage bottom plate 4. Two locating pin mounting holes 8 are provided on the tin storage bottom plate 4. The press-fit ends 9 of the two locating pins 7 are respectively fitted with the two locating pin mounting holes 8 by interference fit, and the rods at the bottom of the two locating pins 7 extend downward from the bottom of the two locating pin mounting holes 8 respectively. The locating pins 7 can be made of steel to increase the wear resistance of their surface; the interference fit between the locating pins 7 and the locating pin mounting holes 8 can not only ensure the position accuracy of the two locating pins 7 after being pressed on the tin storage bottom plate 4, but also meet the requirements that the two locating pins 7 are sturdy, durable, and will not fall off during normal use. By means of two positioning pins 7 cooperating with two threaded bottom holes on the mounting end face 6 of the casing 2, the bottom face of the tin storage bottom plate 4 fits with the mounting end face 6 of the casing 2, forming a "one face, two pins" positioning, thereby realizing the positioning installation of the tin storage bottom plate 4 on the casing 2.

[0027] The fixing seat 3 is located outside the stator assembly 1, and the fixing seat 3 is an arc-shaped seat arranged concentrically with the stator assembly 1. Two harness fixing grooves 10 for placing the temperature sensor wires of the stator assembly 1 are opened on the top of the fixing seat 3, and a pressing plate 11 that can be opened and closed is provided on the top of the fixing seat 3, and the temperature sensor wires in the harness fixing grooves 10 are pressed and fixed by the closed pressing plate 11.

[0028] One end of the pressing plate 11 is hinged to the fixing seat 3 through a hinge 12, and the other end is a free end. A sunken avoidance groove 13 is provided on the top of the fixing seat 3 near the free end of the pressing plate 11. The free end of the pressing plate 11 in the closed state is suspended on the avoidance groove 13. The avoidance groove 13 is provided to facilitate the opening and closing operation of the pressing plate 11.

[0029] The pressing plate 11 and the top of the fixing seat 3 are adsorbed together by magnetic attraction. The pressing plate 11 is a magnetic steel plate. Two magnet placement holes are opened on the top of the fixing seat 3. The two magnet placement holes are respectively embedded with magnets 14. The magnets 14 are bonded and fixed to the magnet placement holes to prevent the magnets 14 from accidentally falling out during normal use. The closure between the pressing plate 11 and the fixing seat 3 is achieved by the magnetic attraction between the magnetic steel plate and the magnets 14. The magnets 14 can be cylindrical magnets of neodymium iron boron. The pressing plate 11 is a steel stamping plate. On the one hand, it can have a magnetic attraction with the magnets 14. On the other hand, the steel stamping plate itself has sufficient strength to stably press the cable to ensure the tinning operation.

[0030] Among them, the tin storage bottom plate 4 can be made of aluminum alloy, and the fixing seat 3 can be made of steel to increase the overall stability of the tooling.

[0031] The working process of the pre-positioning tool provided in this embodiment is as follows:

[0032] On-site workers hoist the assembled housing 2 of the stator assembly 1 onto the material flow platform, and transfer it through the wire body to the temperature-sensitive line point tin welding process.

[0033] In the spot tinning process, the operator first puts a PVC heat shrink tube on the two sensor wires of the positive and negative poles of the temperature sensor respectively, and twists the two sensor wires of the positive and negative poles of the temperature sensor with the vehicle connector cable one by one. The twisted part of the two forms a twisted section. The twisted section should be clear and neat, without loose or messy wires.

[0034] After the splicing is completed, the operator positions the pre-positioning tool on the mounting end face 6 of the casing 2. The two positioning pins 7 of the tool are just inserted into the two threaded bottom holes on the mounting end face 6 of the casing 2 until the bottom surface of the tin storage bottom plate 4 fits with the mounting end face 6 of the casing 2. The positioning of the tool on the product is completed through the positioning method of "one side and two pins". Then, open the pressure plate 11 on the tool, and the operator sequentially installs the two sensor wires of the above-mentioned temperature sensor into the wire harness fixing groove 10 on the fixing seat 3, and places the parts of the two sensor wires close to the twisted section in the two wire harness fixing grooves 10. In order to ensure reliable compression of the wire body in the later stage, the total height of the two sensor wires assembled into the groove is slightly higher than the wire harness fixing groove 100.1~0.2mm. Then the operator closes the pressure plate 11 of the tooling, and the closed pressure plate 11 is pressed against the fixing seat 3 by magnetic attraction. The magnetic attraction is transmitted to the two sensor wires through the pressure plate 11, so that the two sensor wires can remain stable and motionless under the condition of light touch of spot tinning. At this time, the twisted section waiting for spot tinning is just suspended above the tin drop groove 5.

[0035] After completing the above steps, the operator can perform the tinning operation on the twisted section. The operator holds the welding gun in one hand and the tin wire in the other hand, and touches the heated twisted section with the welding gun, so that the tin wire quickly melts and wraps the entire cable twisted section, thus completing the tinning operation of the positive and negative sensing wires of the temperature sensor.

[0036] Finally, the operator opens the pressure plate 11, removes the positive and negative sensing wires of the temperature sensor, moves the PVC heat shrink tube that has been inserted in advance to the outside of the twisted section, and heats the PVC heat shrink tube with a heat drying gun to complete the insulation protection treatment of the exposed part of the wire body.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stator assembly temperature sensing line point tin pre-positioning tool, the stator assembly is installed on the casing, characterized in that: The pre-positioning tooling includes a fixing seat, a tin storage base plate is provided at the bottom of the fixing seat, the main part of the tin storage base plate protrudes from the fixing seat and is provided with a tin drop groove with a closed bottom, the tin storage base plate is detachably mounted on a casing outside the stator assembly, two wiring harness fixing grooves for placing the temperature sensor sensor wires of the stator assembly are provided at the top of the fixing seat, and a pressure plate that can be opened and closed is provided at the top of the fixing seat, and the temperature sensor sensor wires in the wiring harness fixing grooves are pressed and fixed by the closed pressure plate.

2. A stator assembly temperature sensing line point tin pre-positioning tool as claimed in claim 1, characterized in that: The pressing plate and the top of the fixing seat are adsorbed together by magnetic attraction.

3. A stator assembly temperature sensing line point tin pre-positioning tool as claimed in claim 2, characterized in that: The pressing plate is a magnetic steel plate, and a magnetic steel is embedded on the top of the fixing seat. The closing between the pressing plate and the fixing seat is achieved by the magnetic attraction between the magnetic steel plate and the magnetic steel.

4. A stator assembly temperature sensing line point tin pre-positioning tool as claimed in claim 2, characterized in that: One end of the pressing plate is hinged on the fixing seat, and the other end is a free end.

5. A stator assembly temperature sensing line point tinning pre-positioning tool as claimed in claim 1, wherein the housing is provided with a mounting end surface at a location located outside the stator assembly, and a threaded bottom hole is opened on the mounting end surface of the housing, characterized in that: The tin storage base plate is provided with two positioning pins, and the rods of the two positioning pins extend downward from the bottom of the tin storage base plate. The two positioning pins cooperate with the two threaded bottom holes on the mounting end surface of the casing. At the same time, the bottom surface of the tin storage base plate fits with the mounting end surface of the casing to realize the positioning installation of the tin storage base plate on the casing.

6. A stator assembly temperature sensing line point tin pre-positioning tool as claimed in claim 5, characterized in that: The tin storage bottom plate is provided with two locating pin installation holes, the press-fit ends of the two locating pins are respectively interference fitted with the two locating pin installation holes, and the rods at the bottom of the two locating pins respectively extend downward from the bottom of the two locating pin installation holes.

7. The stator assembly temperature sensing line point tin pre-positioning tool as claimed in claim 1, characterized in that: The fixing seat is located at the periphery of the stator assembly, and the fixing seat is an arc-shaped seat arranged concentrically with the stator assembly.

8. The stator assembly temperature sensing line point tin pre-positioning tool as claimed in claim 4, characterized in that: The top of the fixing seat is provided with a sunken avoidance groove at one end close to the free end of the pressing plate, and the free end of the pressing plate in a closed state is suspended on the avoidance groove.

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