A power wrench with a control system

Abstract

The application relates to an electric wrench with a control system applied to the field of electric wrenches. When the electric wrench is used, the plug-in part and the buckling cylinder can realize relatively convenient dismounting and splicing, air flow can be kept through the inside of the wrench shell and the battery box through the use of the air-permeable frame, the inside of the wrench shell can be conveniently radiated, the inside of the battery box is driven to radiate, in addition, when the inside is radiated and controlled, the temperature sensor needs to be matched, when the radiating capacity of the fan blade cannot meet the radiating demand, the lower part of the box body of the battery box can be driven to rotate around the shaft rod as the center, the contact heat exchange area of the battery body in the battery box and air is increased, the radiating effect is enhanced, in addition, the electromagnetic vertical block and the adjusting driving unit are matched, the battery body in the lower layer position can be turned over, and the radiating is more uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric wrench, in particular to an electric wrench with a control system applied to the field of electric wrenches. BACKGROUND

[0002] Electric wrench, also known as high-strength bolt gun, is widely used in various scenes of bolt tightening operation, such as scaffold installation and disassembly, automobile tire loading and unloading, etc. Electric wrench has the characteristics of strong torque, time and labor saving. The performance of the motor is a very important core index when in use. When the electric wrench is in use, the heat dissipation of the motor needs to be paid attention to in order to ensure the stable performance of the motor.

[0003] Chinese patent CN202010189656.8 specification discloses an electric wrench with fixing function. The electric wrench can be fixed by the fixing mechanism, reducing the probability of torsion of the main body of the electric wrench, improving the safety of the electric wrench, and accelerating the heat dissipation efficiency of the electric wrench through the heat dissipation mechanism, improving the reliability of the electric wrench.

[0004] When the existing electric wrench is in use, the rotation of the fan blade is used to realize the heat dissipation in the shell. However, the battery of the electric wrench is usually clamped at the bottom end of the shell, and the airflow in the shell is in a relatively closed state. When the electric wrench is working, the airflow provided by the rotation of the fan blade can accelerate the heat dissipation of the motor, but the heat dissipation demand of the battery which supplies energy for the motor also needs to be guaranteed in order to ensure the stable performance of the motor. SUMMARY

[0005] In view of the above prior art, the technical problem to be solved by the present application is to consider the synchronous heat dissipation of the motor and the battery when the electric wrench is working, so as to ensure the stable performance of the motor and the stable use of the electric wrench.

[0006] In order to solve the above problems, the present application provides an electric wrench with a control system, which comprises an internally hollow wrench shell, a brushless motor is installed in the inside of the wrench shell, a fan blade is connected to the output shaft of the brushless motor, a buckling cylinder is arranged at the bottom of the wrench shell, a recess is arranged on the inner wall of the buckling cylinder, a battery box is arranged below the wrench shell, the battery box is composed of two box bodies assembled by a shaft rod, a breathable frame is arranged at the top of the battery box, a waterproof breathable plate is embedded and installed in the inside of the breathable frame, a plug-in part with the same diameter as the inner diameter of the buckling cylinder is installed at the top of the waterproof breathable plate, a containing groove is arranged in the inside of the plug-in part, a compression spring is connected to the inside of the containing groove, and an electromagnetic plug block matched with the recess is connected to both ends of the compression spring.

[0007] The top of the waterproof and breathable plate is provided with a support on one side of the plug-in part, the top of the support is provided with a driving motor, the output end of the driving motor is connected with a driving gear, the top of the support is provided with a rotating rod in front of the driving motor, the surface of the rotating rod is fixedly sleeved with a driven gear which is in mesh with the driving gear, the surface of the rotating rod is wound with a pull cable, and the tail end of the pull cable is connected with the surface of the lower part of the box body of the battery box.

[0008] In the electric wrench with the control system, the assembly of the air permeable frame, the driving motor, the pull cable and the battery box can ensure the synchronous heat dissipation of the motor and the battery during use, and ensure the stability of the motor performance and the stable use of the electric wrench.

[0009] As a further improvement of the present application, an auxiliary control system is further included, which comprises a processor installed in the wrench housing, a monitoring module, an execution module and a control module connected to the processor, the monitoring module comprises a temperature sensor installed in the wrench housing for monitoring the temperature change in the wrench housing, the execution module is in signal connection with the brushless motor and the driving motor for controlling the on-off state of the brushless motor and the driving motor, and the control module is in signal connection with the electromagnetic blocks for starting the two electromagnetic blocks to attract each other and be accommodated in the accommodating groove when the plug-in part is removed.

[0010] As a further improvement of the present application, the bottom of the support is provided with a guide rod corresponding to the pull cable, and the pull cable penetrates through the air permeable frame and the upper part of the box body of the battery box.

[0011] As a further improvement of the present application, the inner wall of the battery box is provided with a plurality of limiting frames arranged in an up-down manner, and the inside of the limiting frame is connected with an extrusion spring made of conductive material, and the inside of the battery box is connected with the battery body through the limiting frame.

[0012] As a further improvement of the present application, the limiting frame is fixedly connected with the inner wall of the battery box, and the battery body partially overlaps with the limiting frame in the plugged state, and the limiting frame is made of insulating material.

[0013] As a further improvement of the present application, the sum of the cross-sectional lengths of the electromagnetic blocks is less than the cross-sectional length of the accommodating groove, and the cross-sectional area of the air permeable frame is not greater than the cross-sectional area of the bottom of the wrench housing.

[0014] As another improvement of the present application, the bottom wall of the lower part of the box body of the battery box is provided with an electromagnetic block below the battery body and an adjustment driving unit, the electromagnetic blocks are symmetrically arranged, the adjustment driving unit is located at the central position of the battery body, the adjustment driving unit comprises a rubber strip, two series-connected strips are connected in the inside of the rubber strip, a horizontal strip corresponding to the series-connected strips is arranged below the rubber strip, the two ends of the series-connected strips and the horizontal strip are movably connected through movable frames, and a micro electric stretching plate is connected to the surface of the movable frame.

[0015] As a further improvement of the present application, the surface of the micro electric stretching plate near the electromagnetic upright block is coated with a magnetic layer, the cross-sectional width of the rubber strip, the stringing strip and the battery box gradually increases, the rubber strip is in contact with the surface of the battery body in the initial state, and the two ends of the rubber strip are in contact with the surface of the battery body on both sides of the lower part of the box body.

[0016] As a further improvement of the present application, the electromagnetic upright block is signal connected with the control module for controlling the overturning of the battery body in the lower part of the box body by the adjustment driving unit.

[0017] In summary, the electric wrench of the present application can be conveniently disassembled and spliced by using the plug-in part and the buckling cylinder, and the internal airflow of the wrench shell and the battery box is maintained in a through state by using the air permeable frame, which facilitates the internal heat dissipation of the wrench shell. In addition, when the heat dissipation capacity of the fan blade cannot meet the heat dissipation demand, the lower part of the box body of the battery box can be rotated around the shaft as the center under the cooperation of the driving motor and the pull cable, thereby increasing the contact heat exchange area between the battery body and the air in the battery box and strengthening the heat dissipation effect. In addition, the electromagnetic upright block and the adjustment driving unit can be used to overturn the battery body in the lower layer position, so that the heat dissipation is more uniform. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall appearance structure of the first embodiment of the present application;

[0019] Figure 2 It is an installation diagram of the brushless motor, fan blade and battery box of the first embodiment of the present application;

[0020] Figure 3 It is an installation diagram of the battery box, air permeable frame and pull cable of the first embodiment of the present application;

[0021] Figure 4 It is an internal installation diagram of the plug-in part and the buckling cylinder of the first embodiment of the present application;

[0022] Figure 5 It is a schematic diagram of the internal structure of the battery box of the first embodiment of the present application;

[0023] Figure 6 It is an enlarged schematic diagram of A in the first embodiment of the present application; Figure 5

[0024] Figure 7 It is a state diagram of the lower part of the box body of the battery box of the first embodiment of the present application being opened;

[0025] ​Figure 8 This is an installation diagram of the battery box, limiting frame, and battery body according to the first embodiment of this application;

[0026] Figure 9 For this application Figure 8 Enlarged diagram of point B in the diagram;

[0027] Figure 10 This is an installation diagram of the electromagnetic support block and adjustment drive unit according to the second embodiment of this application;

[0028] Figure 11 This is an assembly diagram of the adjustment and mounting unit according to the second embodiment of this application;

[0029] Figure 12 This is a diagram showing the state of the battery body flipping over due to the movement of the rubber strip in the second embodiment of this application.

[0030] Figure 13 This is a state diagram of the electromagnetic block in the second embodiment of this application, showing the rubber strip leaving the surface of the battery body and returning to the other side.

[0031] Explanation of the labels in the diagram:

[0032] 1. Wrench housing; 11. Snap-fit ​​cylinder; 2. Battery box; 21. Ventilation frame; 22. Connector; 23. Electromagnetic plug; 24. Compression spring; 3. Brushless motor; 4. Fan blade; 5. Pull cable; 6. Rotating rod; 7. Battery body; 71. Compression spring; 72. Limit frame; 8. Drive motor; 9. Drive gear; 10. Driven gear; 12. Electromagnetic stand; 13. Adjustment drive unit; 131. Rubber strip; 132. Connecting strip; 133. Movable frame; 134. Miniature electric extension plate. Detailed Implementation

[0033] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] First implementation method:

[0035] Figures 1-2 An electric wrench with a control system is shown, including a hollow wrench housing 1. A brushless motor 3 is installed inside the wrench housing 1, and a fan blade 4 is connected to the output shaft of the brushless motor 3. A locking cylinder 11 is provided at the bottom of the wrench housing 1, and the inner wall of the locking cylinder 11 has a recess. A battery box 2 is arranged below the wrench housing 1, and the battery box 2 is composed of two parts assembled by a shaft. A vent frame 21 is provided at the top of the battery box 2, and a waterproof and breathable plate is fitted inside the vent frame 21. A connector 22 with the same diameter as the inner diameter of the locking cylinder 11 is installed on the top of the waterproof and breathable plate. Figure 4It is shown that the inside of the plug-in part 22 is provided with a receiving groove, the inside of the receiving groove is connected with a compression spring 24, and both ends of the compression spring 24 are connected with electromagnetic plug blocks 23 matched with the recesses;

[0036] Figure 3 And Figures 5-6 It is shown that the top of the waterproof and breathable plate is provided with a support on one side of the plug-in part 22, the top of the support is provided with a driving motor 8, the output end of the driving motor 8 is connected with a driving gear 9, the top of the support is provided with a rotating rod 6 in front of the driving motor 8, the surface of the rotating rod 6 is fixedly sleeved with a driven gear 10 meshed with the driving gear 9, the surface of the rotating rod 6 is wound with a pull cable 5, and the tail end of the pull cable 5 is connected with the surface of the lower part of the box body of the battery box 2.

[0037] It also includes an auxiliary control system, which includes a processor installed in the wrench housing 1, and the processor is connected with a monitoring module, an execution module and a control module, the monitoring module includes a temperature sensor installed in the wrench housing 1, used for monitoring the temperature change in the wrench housing 1, the execution module is signal connected with the brushless motor 3 and the driving motor 8, used for controlling the opening and closing state of the brushless motor 3 and the driving motor 8, and the control module is signal connected with the electromagnetic plug blocks 23, used for starting the two electromagnetic plug blocks 23 to attract each other and be received into the receiving groove when the plug-in part 22 is removed.

[0038] The bottom of the support is provided with a guide rod corresponding to the pull cable 5, and the pull cable 5 penetrates through the breathable frame 21 and the upper part of the box body of the battery box 2.

[0039] Specifically, when connecting the battery box 2 and the wrench housing 1, the plug-in part 22 is inserted into the buckling cylinder 11, and is subjected to the extrusion action of the inner wall of the buckling cylinder 11, the two electromagnetic plug blocks 23 are extruded into the inside of the receiving groove, until the plug-in part 22 moves to the recessed position, the electromagnetic plug blocks 23 are released and inserted into the recesses, forming a constraint connection, so that the battery box 2 and the wrench housing 1 are connected, and then when the battery box 2 and the wrench housing 1 are separated, the electromagnetic plug blocks 23 need to be started, so that the two electromagnetic plug blocks 23 generate an attractive force, and then the electromagnetic plug blocks 23 are attracted to each other until they are received into the receiving groove, and then the plug-in part 22 is pulled downward to separate from the buckling cylinder 11;

[0040] When the electric wrench is used, the brushless motor 3 in the wrench housing 1 is started, and drives the fan blade 4 to rotate, promoting the air flow exchange heat treatment between the inside and outside of the wrench housing 1, at the same time, since the wrench housing 1 is hollow and the wrench housing 1 and the battery box 2 are connected by the waterproof and breathable plate, the battery box 2 and the inside of the wrench housing 1 are in air flow through state, which assists to realize the internal heat dissipation of the two;

[0041] When the heat dissipation capacity of the fan blade 4 cannot meet the heat dissipation requirement inside the battery box 2, that is, when the temperature inside the wrench shell 1 exceeds the heat dissipation capacity of the fan blade 4, the driving motor 8 is started, the driving gear 9 and the driven gear 10 are engaged, the rotating rod 6 is rotated, the pull cable 5 is released, and the upper and lower part of the box body in the constrained state is partially separated to form an open state (as shown in Figure 7 In this process, due to the connection of the plug-in part 22 and the buckling cylinder 11, the upper part of the battery box 2 is constrained, so that the lower part of the battery box 2 can remain in a relatively static state when it is released.

[0042] Figures 8-9 As shown, the inner wall of the battery box 2 is provided with a plurality of limiting frames 72 arranged in an up-down manner, and the inside of the limiting frame 72 is connected with an extrusion spring 71 made of conductive material. The inside of the battery box 2 is plugged with the battery body 7 through the limiting frame 72.

[0043] The limiting frame 72 is fixedly connected with the inner wall of the battery box 2, and the battery body 7 partially overlaps with the limiting frame 72 in the plugged state. The limiting frame 72 is made of insulating material.

[0044] Specifically, in the battery box 2, the battery body 7 is connected and constrained by the extrusion spring 71 and the limiting frame 72. When the lower part of the battery box 2 is tilted, the design of the limiting frame 72 can effectively prevent the battery body 7 from being displaced due to tilting, so that the power supply of the battery body 7 can be normally performed.

[0045] The sum of the cross-sectional lengths of the electromagnetic plug-in block 23 is less than the cross-sectional length value of the accommodating groove, and the cross-sectional area of the air permeable frame 21 is not greater than the cross-sectional area of the bottom of the wrench shell 1.

[0046] Specifically, the area of the air permeable frame 21 is not greater than the area of the bottom of the wrench shell 1, so that when the wrench shell 1 and the battery box 2 are connected, they can maintain more effective air exchange.

[0047] Second embodiment:

[0048] Figures 10-11 As shown, the bottom wall of the lower part of the battery box 2 is provided with an electromagnetic block 12 below the battery body 7 and an adjusting driving unit 13. The electromagnetic block 12 is symmetrically arranged, and the adjusting driving unit 13 is located at the central position of the battery body 7. The adjusting driving unit 13 includes a rubber strip 131, two series-connected strips 132 are connected inside the rubber strip 131, a horizontal strip corresponding to the series-connected strip 132 is arranged below the rubber strip 131, the two ends of the series-connected strip 132 and the horizontal strip are movably connected through a movable frame 133, and a micro electric stretching plate 134 is connected to the surface of the movable frame 133.

[0049] The micro electric stretching plate 134 is coated with a magnetic layer near the surface of the electromagnetic vertical block 12, the sectional width of the rubber strip 131, the connecting strip 132 and the battery box 2 gradually increases, the rubber strip 131 is in contact with the surface of the battery body 7 in the initial state, and the two ends of the rubber strip 131 are in contact with the surface of the battery body 7 on both sides of the lower part of the box body in the battery box 2.

[0050] The electromagnetic vertical block 12 is signal connected with the control module, and is used for controlling the overturning of the battery body 7 in the lower part of the box body of the battery box 2 by the driving unit 13.

[0051] Different from the first embodiment, in the first embodiment, when the lower part of the box body of the battery box 2 is inclined, the battery body 7 in the upper part of the box body is in a relatively uniform heat dissipation state under the action of the upper air permeable frame 21 and the open state, and the opening degree between the lower half of the battery body 7 and the bottom wall of the lower part of the box body of the battery box 2 is low, which affects the heat exchange efficiency. The phenomenon is improved and treated, and can also be used for the turnover treatment of the battery body 7 at the lower position under the non-inclined state of the lower part of the box body of the battery box 2, and is used for promoting heat dissipation.

[0052] Specifically, during the turnover treatment, one of the electromagnetic vertical blocks 12 (the left side shown in Figure 12 ) is started to be attracted to the magnetic layer, thereby driving the movable frame 133 and the connecting strip 132, the horizontal rod and the rubber strip 131 connected thereto to move horizontally, driving the battery body 7 in contact with the rubber strip 131 to overturn and change the surface with a small amplitude (as shown in Figure 12 ), and after the connecting strip 132 reaches the left end position, the micro electric stretching plate 134 is retracted to compress the movable frame 133, thereby shortening the vertical distance between the connecting strip 132 and the horizontal rod, so that the rubber strip 131 is separated from the surface of the battery body 7, and then the electromagnetic vertical block 12 on the other side is started, and the electromagnetic vertical block 12 on one side is closed, so that the attraction force generated thereby drags the rubber strip 131 back to the right end position (as shown in Figure 13 ), and then the micro electric stretching plate 134 is extended to extend the movable frame 133, so that the rubber strip 131 is reattached to the surface of the battery body 7, and the above steps are repeated, so that the turnover operation of the battery body 7 is realized, so that the battery body 7 can be subjected to overall heat exchange contact treatment to improve the heat exchange efficiency.

[0053] In summary, the electric wrench can be conveniently disassembled and spliced by using the plug-in part 22 and the buckling cylinder 11. The internal airflow of the wrench housing 1 and the battery box 2 is maintained by using the air-permeable frame 21, which facilitates the internal heat dissipation of the wrench housing 1 and the battery box 2. In addition, the temperature sensor is needed for the internal heat dissipation control process. When the heat dissipation capacity of the fan blade 4 cannot meet the heat dissipation demand, the lower part of the battery box 2 is rotated around the shaft as the center under the cooperation of the driving motor 8 and the pull cable 5, thereby increasing the contact heat exchange area between the battery body 7 in the battery box 2 and the air and strengthening the heat dissipation effect. In addition, the electromagnetic vertical block 12 and the adjusting driving unit 13 can flip the battery body 7 in the lower layer to make the heat dissipation more uniform.

[0054] In combination with the current actual demand, the above-mentioned embodiments of the present application are not limited to the scope, and various changes made within the knowledge of those skilled in the art without departing from the concept of the present application still fall within the protection scope of the present application.

Claims

1. An electric wrench with a control system, comprising an internally hollow wrench housing (1), a brushless motor (3) is installed in the inside of the wrench housing (1), a fan blade (4) is connected to the output shaft of the brushless motor (3), characterized in that: The bottom of the wrench shell (1) is provided with a buckling cylinder (11), the inner wall of the buckling cylinder (11) is provided with a recess, the lower part of the wrench shell (1) is arranged with a battery box (2), and the battery box (2) is a two-part box body assembled by a shaft rod, the top of the battery box (2) is provided with a breathable frame (21), and a waterproof breathable plate is embedded and installed in the inside of the breathable frame (21), the top of the waterproof breathable plate is provided with a plug-in part (22) with the same inner diameter as the buckling cylinder (11), the inside of the plug-in part (22) is provided with a containing groove, the containing groove is connected with a compression spring (24), and the two ends of the compression spring (24) are connected with electromagnetic plug blocks (23) matched with the recess. The top of the waterproof breathable plate is provided with a support on one side of the plug-in part (22), the top of the support is provided with a driving motor (8), the output end of the driving motor (8) is connected with a driving gear (9), the top of the support is provided with a rotating rod (6) in front of the driving motor (8), the surface of the rotating rod (6) is fixedly sleeved with a driven gear (10) meshed with the driving gear (9), the surface of the rotating rod (6) is wound with a pull cable (5), and the tail end of the pull cable (5) is connected with the surface of the lower part of the box body of the battery box (2). It also includes an auxiliary control system, the auxiliary control system includes a processor installed in the wrench shell (1), the processor is connected with a monitoring module, an execution module and a control module, the monitoring module includes a temperature sensor installed in the wrench shell (1), used for monitoring the temperature change in the wrench shell (1), the execution module is signal connected with the brushless motor (3) and the driving motor (8), used for controlling the opening and closing state of the brushless motor (3) and the driving motor (8), the control module is signal connected with the electromagnetic plug blocks (23), used for starting the two electromagnetic plug blocks (23) to attract each other and be received into the containing groove when the plug-in part (22) is removed.

2. The electrically powered wrench with a control system according to claim 1, characterized in that: The bottom of the support is provided with a guide rod corresponding to the pull cable (5), and the pull cable (5) penetrates through the breathable frame (21) and the upper part of the box body of the battery box (2).

3. The electrically powered wrench with a control system according to claim 1, wherein: The inner wall of the battery box (2) is provided with a plurality of limiting frames (72) arranged up and down, and the inside of the limiting frame (72) is connected with an extrusion spring (71) made of conductive material, and the inside of the battery box (2) is inserted with a battery body (7) through the limiting frame (72).

4. The electrically powered wrench with a control system according to claim 3, characterized in that: The limiting frame (72) is fixedly connected with the inner wall of the battery box (2), and the battery body (7) partially overlaps with the limiting frame (72) in the inserted state, and the limiting frame (72) is made of insulating material.

5. The electrically powered wrench with a control system according to claim 1, wherein: The sum of the cross-sectional lengths of the electromagnetic plug blocks (23) is less than the cross-sectional length value of the containing groove, and the cross-sectional area of the breathable frame (21) is not greater than the cross-sectional area of the bottom of the wrench shell (1).

6. The electrically powered hand tool with a control system of claim 3, wherein: The bottom wall of the lower part of the box body of the battery box (2) is provided with an electromagnetic vertical block (12) below the battery body (7) and an adjusting driving unit (13), wherein the electromagnetic vertical block (12) is symmetrically arranged, and the adjusting driving unit (13) is located at the central position of the battery body (7), the adjusting driving unit (13) comprises a rubber strip (131), two series connection strips (132) are connected inside the rubber strip (131), a horizontal strip corresponding to the series connection strip (132) is arranged below the rubber strip (131), and the two ends of the series connection strip (132) and the horizontal strip are movably connected through movable racks (133). The surface of the movable rack (133) is connected with a micro electric stretching plate (134).

7. The electrically powered hand tool with a control system according to claim 6, characterized in that: The surface of the micro electric stretching plate (134) close to the electromagnetic vertical block (12) is coated with a magnetic layer, the cross-sectional width values of the rubber strip (131), the series connection strip (132) and the battery box (2) gradually increase, and in the initial state, the rubber strip (131) is in contact with the surface of the battery body (7), and the two ends of the rubber strip (131) are in contact with the surfaces of the battery bodies (7) on the two sides in the lower part of the box body of the battery box (2).

8. The electrically powered hand tool with a control system according to claim 6, wherein: The electromagnetic vertical block (12) is signal-connected with a control module, and is used for controlling the adjusting driving unit (13) to overturn the battery body (7) in the lower part of the box body of the battery box (2).

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