Handheld electric crimping pliers

Abstract

The invention relates to handheld electric crimping pliers, and belongs to the technical field of electric tools. The crimping pliers comprise a grab handle for limiting a central axis, and a shell for accommodating a motor, the middle parts of the left jaw and the right jaw are respectively hinged in the shell, and one ends of the left jaw and the right jaw extend out of the shell and tend to be far away from the central axis to open; after the manual driving block and the electric driving block are driven, the left jaw and the right jaw tend to be closed with each other; the manual driving block is provided with a manual combination position and a manual separation position which are perpendicular to the direction of the central axis and tend to the manual combination position; when the electric driving block is driven to move to the position where the left jaw and the right jaw are completely closed, the manual driving block is forced to be located at the manual separation position, the generator is triggered to rotate reversely, and the left jaw and the right jaw are reset and opened mutually. According to the invention, when the jaw is not closed in place, the jaw cannot be automatically opened and reset, and after the jaw is closed in place, the jaw is automatically opened and reset without being influenced by human factors, so that the wire pressing quality is ensured, and the operation is more convenient.

Description

Technical Field

[0001] This invention relates to an electric wire crimping tool, and more particularly to a handheld electric wire crimping pliers, belonging to the field of power tool technology. Background Technology

[0002] The typical structure of electric wire crimping pliers is disclosed in Chinese Patent Application No. 201380042456.8. However, due to the "no-load stroke" of the motor after switching from manual to electric operation, it affects the work efficiency. Therefore, Chinese Patent Application No. 202311379628.2 proposes an electric wire crimping tool. In this improved technical solution, the jaw closure is driven by both manual and electric forces, thus achieving manual quick clamping followed by electric force tightening. Moreover, since manual and electric loading are set separately and partially overlap, the electric force directly drives the loading component, reducing the "no-load stroke" of the manual loading component. However, this technical solution has the drawback of not having an automatic jaw opening function. To address this, Chinese patent application number 202510626332.9 proposed a corresponding improvement scheme. This improvement involves structural innovations such as an electric sliding groove in the front support plate, the electric sliding groove forming a sliding pair with the motor drive block, and one end of the motor drive block having an electric opening ramp; and a manual sliding groove in the rear support plate, the manual sliding groove forming a sliding pair with the manual drive block, and the manual drive block having a manual opening groove. This achieves the goal that when the switch wrench is released, the left and right sliders reset under the action of the elastic pull, automatically opening the left and right jaws. This shortens operation time, improves efficiency, and makes operation more convenient. However, in practice, this improved scheme requires the operator to observe that the wire is properly pressed before releasing the switch wrench for the jaws to automatically open due to the release of constraint. This not only fails to achieve truly fully automatic opening, but also means that if the wire is not properly pressed due to jaw obstruction and the operator releases the switch wrench, the jaws will still open, thus failing to guarantee proper wire pressing and affecting the quality of the pressing operation. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the existing technology by proposing an electric wire crimping tool that cannot automatically open and reset when the jaws are not fully closed, but can automatically open and reset without the influence of a switch or wrench once fully closed, thereby ensuring the quality of wire crimping and making the operation faster and more convenient.

[0004] To achieve the above objectives, the basic technical solution of the handheld electric wire crimping pliers of the present invention includes: The housing includes a handle that defines the central axis in the direction of extension and houses the motor; The left and right jaws are hinged in the middle of the housing, with one end extending out of the housing and opening away from the central axis. The manual drive block and the electric drive block are driven in a direction parallel to the central axis, causing the left jaw and the right jaw to tend to close together. The manual drive block has a manual engagement position and a manual disengagement position perpendicular to the central axis, and tends to be in the manual engagement position; When the electric drive block is driven to the fully closed position of the left and right jaws, it forces the manual drive block to the manual disengagement position and triggers the motor reversal switch, allowing the left and right jaws to reset and open.

[0005] With this invention, the manual drive block is only in the manually disengaged position when the electric drive block is driven to the fully closed position of the left and right jaws, thus no longer affecting the movement of the jaws. Then, the motor reversing switch is triggered, and the electric drive block, driven in reverse, opens up the opening space of the left and right jaws, allowing them to automatically reset and open quickly for the next wire pressing. Before this, when the electric drive block has not reached the fully closed position of the left and right jaws, the manual drive block remains engaged with the manual mechanism due to its tendency, the motor reversing switch cannot be triggered, and the position of the left and right jaws is still constrained by the electric drive block. Therefore, even if the wire is not properly pressed due to jaw obstruction or other reasons, the jaws will not open when the operator releases the switch wrench, prompting the operator to take measures to ensure proper wire pressing and avoid wire pressing quality problems. Attached Figure Description

[0006] The invention will now be further described with reference to the accompanying drawings.

[0007] Figure 1 This is a three-dimensional exploded structural diagram of Embodiment 1 of the present invention.

[0008] Figure 2 yes Figure 1 A schematic diagram of the structural position before the pressure line is pressed in the embodiment.

[0009] Figure 3 yes Figure 2 A schematic diagram of the rear view structure.

[0010] Figure 4 yes Figure 3 A magnified schematic diagram of the partial structure in the AA direction section.

[0011] Figure 5 yes Figure 1 A schematic diagram of the structure for manually switching the electric pressure wire position in the embodiment.

[0012] Figure 6 yes Figure 5 A schematic diagram of the rear view structure.

[0013] Figure 7 yes Figure 6A partially enlarged structural schematic diagram of the BB direction cross-section.

[0014] Figure 8 yes Figure 1 A schematic diagram of the structure at the position of the electric pressing line in the embodiment.

[0015] Figure 9 yes Figure 8 A schematic diagram of the rear view structure.

[0016] Figure 10 yes Figure 9 A magnified schematic diagram of the partial structure in the CC direction section.

[0017] Figure 11 yes Figure 1 A schematic diagram of the structure for automatically opening the position in the embodiment.

[0018] Figure 12 yes Figure 11 A schematic diagram of the rear view structure.

[0019] Figure 13 yes Figure 12 A magnified schematic diagram of the partial structure in the DD direction section.

[0020] In the diagram—10: Housing; 20: Rear adjusting lever; 30: Rear support plate; 40: Left jaw; 50: Right jaw; 60: Front support plate; 70: Switch wrench; 80: Tension spring; 90: Manual drive block; 100: Reset spring; 101: First micro switch; 102: Second micro switch; 103: Third micro switch; 104: Fourth micro switch; 110: Right slider; 120: Left slider; 130: Motor drive block; 140: Front cover; 150: Oil reservoir cap; 160: Motor; 170: Gearbox; 171: Drive shaft; 180: Front adjusting lever; 190: Reset compression spring; 210: Disc-shaped washer; 30a: Manual slide rail; 30b: clearance groove; 60a: electric slide rail; 60b: opening slide rail; 90a: manual guide protrusion; 90b: manual opening slide rail; 90c: manual disengagement ramp; 110a: tension spring hook; 110b: guide post; 110c: pulley; 130a: electric opening ramp; 130b: electric ejection ramp; 130c: push-off protrusion. Detailed Implementation Example 1

[0021] The overall structure of the electric handheld wire crimping pliers in this embodiment is as follows: Figure 1 As shown, a front support plate 60 and a rear support plate 30 are fixed in the housing 10, which is formed by the joining of two halves of the housing. The handle extending from the housing 10 defines the central axis x. A drive shaft 171 driven by a motor 160 through a gearbox 170 is installed in the handle of the housing 10.

[0022] The drive shaft 171 and the center hole of the motor drive block 130 form a helical pair for transmission connection, and a disc-shaped gasket 210 for buffering is installed between them. The front and rear support plates 60 and 30 are hinged to the left and right jaws 40 and 50 located between them on the upper sides away from the motor, respectively, and the front and rear adjusting levers 180 and 20 are hinged in the middle and coaxially, and the switch wrench 70 is hinged on the lower side.

[0023] The front adjusting lever 180 is located outside the front support plate 60, and the rear adjusting lever 20 is located outside the rear support plate 30. The partial teeth of the end of the switch wrench 70 away from the handle engage with the adjacent ends of the front and rear adjusting levers 180 and 20 respectively, and the part of it that is not engaged is equipped with a return spring 190.

[0024] The outer ends of the left and right jaws 40 and 50 extend from the housing, and the inner ends are equipped with rollers. The front and rear support plates 60 and 30 are equipped with front covers 140 near the jaws to prevent foreign objects and debris from entering the housing.

[0025] The front and rear support plates 60 and 30 are also equipped with a first micro switch 101 for controlling the electric start forward rotation, a fourth micro switch 104 for controlling the electric reverse rotation, a second micro switch 102 for controlling the jaws to close to the position and stop, and a third micro switch 103 for controlling the jaws to open to the position and stop.

[0026] The left and right sliders 120 and 110 are hinged to the inner ends of the left and right jaws 40 and 50, respectively. On the side away from the guide post 110c, they each have a spreading cam 110b and a tension spring pin 110a. A tension spring 80 is installed between the pins 110a of the left and right sliders, causing the outer ends of the left and right jaws 40 and 50 to tend to open away from the central axis. The spreading grooves 60b on both sides of the electric slide 60a are respectively inserted into the guide post 110c, which passes through the clearance groove 30b of the rear support plate 30 and forms a sliding pair with it.

[0027] The front support plate 60 has an electric slide groove 60a extending axially along the drive shaft 171 in the middle and a spreading slide groove 60b located on both sides of the electric slide groove. The electric slide groove 60a forms a sliding pair with the electric ejection inclined surface 130b on the surface adjacent to the motor drive block 130. One end of the motor drive block 130 has a symmetrical electric spreading inclined surface 130a corresponding to the two rollers, and a pressing protrusion 130c on the surface opposite to the electric ejection inclined surface 13b.

[0028] The rear support plate 30 has a manual slide groove 30a extending along the drive shaft axis in the middle and a clearance groove 30b extending from one end of the manual slide groove to both sides. The manual slide groove 30a and the manual guide protrusion 90a on the adjacent surface of the manual drive block 90 form a sliding pair. One end of the manual drive block 90 has a symmetrical manual opening slide groove 90b, and the side adjacent to the motor drive block 130 has a manual release slope 90c opposite to the pressure release protrusion 130c. When the pressure-off protrusion 130c is misaligned with the manual disengagement ramp 90c, under the action of a pair of reset springs 100 mounted on the housing 10, the manual drive block tends to the manual engagement position where the switch wrench 70 engages with the front adjusting lever 180 and the rear adjusting lever 20; while when the pressure-off protrusion 130c engages with the manual disengagement ramp 90c, the manual drive block shifts in a direction perpendicular to the central axis and overcomes the elastic effect of the reset springs 100, so that the manual drive block is in the manual disengagement position where the switch wrench 70 is disengaged from the rear adjusting lever 20.

[0029] In its natural state, the switch wrench 70 is in the retracted position under the action of the return spring 190, such as Figure 2 , Figure 3 , Figure 4 As shown, the left and right jaws 40 and 50 are brought together at their lower ends by the action of the tension spring 80 through the left slider 120 and the right slider, while the extended ends are opened.

[0030] When performing manual tightening, the switch wrench 70 is in the initial manual travel position, such as... Figure 4 , Figure 5 , Figure 6 As shown, the inner end of the rear adjusting lever 20 presses down on the manual drive block 90, causing it to manually open the outer surface near the slide groove 90b, which acts on the opening cam 110b, gradually opening the left and right sliders 120 and 110. This causes the outer ends of the left and right jaws 40 and 50 to gradually engage until the first micro switch 101 is triggered by the cam surface of the switch wrench 70. During this process, the pressing protrusion 130c of the electric drive block 130 and the manual disengagement slope 90c of the manual drive block 90 have not yet engaged.

[0031] Then, switch to the later electric clamping stroke, such as... Figure 6 , Figure 7 , Figure 8As shown, the motor 160 starts and drives the electric drive block 130 through the gearbox 170 and the helical pair of the drive shaft. This causes the electric drive block 130 to open the inclined surface 130a and open the left and right sliders 120 and 110 through the corresponding rollers. This drives the left and right jaws 40 and 50 to continue to close with force until they reach the limit position of the force-closing. At this point, the pressure-release protrusion 130c of the electric drive block 130 engages with the manual disengagement inclined surface 90c of the manual drive block 90. ​​This forces the manual drive block 90 to overcome the elastic effect of the reset spring 100 and move in a direction perpendicular to the central axis X. As a result, the manual drive block 90 is in the manual disengagement position where the switch wrench 70 is disengaged from the rear adjusting lever 20. Immediately after the second micro switch 102 is triggered, the motor starts to reverse after a predetermined time of stopping. If the closing force fails to reach the limit position for some reason, the pressing protrusion 130c of the electric drive block 130 cannot engage with the manual disengagement ramp 90c of the manual drive block 90, and therefore the motor cannot be started and reversed after stopping according to the predetermined program.

[0032] After this, regardless of the position of the switch wrench 70, the left and right sliders 120 and 110 will reset under the action of the tension spring 80, causing the protruding ends of the left and right jaws 40 and 50 to open. Figure 11 , Figure 12 , Figure 13 As shown, the pressure-off protrusion 130c of the electric drive block 130 and the manual disengagement ramp 90c of the manual drive block 90 also disengage, causing the manual drive block to reset to the manual engagement position where the switch wrench 70 and the rear adjusting lever 20 are engaged under the action of the elastic element.

[0033] During operation, in case of emergency, the micro switch 104 can be triggered to immediately reverse the motor and open the left and right jaws 40 and 50; once the predetermined jaw opening limit position is reached, the micro switch 103 is triggered and the motor stops.

[0034] The operation process of this embodiment is significantly different from the prior art. The prior art requires the following steps: after the manual pressure block is pressed down to the predetermined position, the electric pressure block is triggered to press down. The operator determines that the pressure is in place, releases the pressure wrench, and the manual pressure block resets while still engaged with the pressure wrench. Then, the electric pressure block resets due to the trigger motor reversing, achieving a complete reset and opening of the jaws. In this embodiment, after the manual pressure block is pressed down to the predetermined position, the electric pressure block is triggered to press down. When the automatic system determines that the pressure is in place, the electric pressure block can reset while the manual pressure wrench is disengaged, and then the manual pressure block resets again to achieve a complete reset and opening of the jaws. Alternatively, the same action as the prior art can be performed: after releasing the pressure wrench, the manual pressure block resets while still engaged with the pressure wrench, and then the electric pressure block resets due to the trigger motor reversing, achieving a reset and opening of the jaws.

[0035] This embodiment presents an electric wire crimping tool that cannot automatically open and reset when the jaws are not fully closed, but can automatically open and reset without human intervention once fully closed, thus ensuring crimping quality and making operation more convenient. In summary, it has the following significant advantages: 1) The compact and stable structure helps to simplify the crimping process and improve work efficiency; 2) Since no manual intervention is required after entering the crimping process, the jaws automatically open and reset after closing in place, thus ensuring stable and reliable crimping quality; 3) The jaws open automatically after crimping, and the action status is obvious, so there is no need for the operator to observe and judge, thus ensuring that the crimping operation is simple and convenient.

[0036] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A handheld electric wire crimping tool, comprising: The housing includes a handle that defines the central axis in the direction of extension and houses the motor; The left and right jaws are hinged in the middle of the housing, with one end extending out of the housing and opening away from the central axis. The manual drive block and the electric drive block are driven in a direction parallel to the central axis, causing the left jaw and the right jaw to tend to close together. Its features are: The manual drive block has a manual engagement position and a manual disengagement position perpendicular to the central axis, and tends to be in the manual engagement position. When the electric drive block is driven to the fully closed position of the left and right jaws, it forces the manual drive block to the manually disengaged position and triggers the motor reversing switch, allowing the left and right jaws to reset and open.

2. The handheld electric wire crimping pliers according to claim 1, characterized in that: The handle portion of the housing is equipped with a motor-driven drive shaft, which also fixes the front and rear support plates; the drive shaft and the center hole of the motor drive block form a helical pair. The front support plate and the rear support plate are respectively hinged to the left jaw and the right jaw located between them on the upper sides away from the motor, and the front adjustment lever and the rear adjustment lever are hinged in the middle and the switch wrench is hinged on the lower side. The teeth at the end of the switch wrench furthest from the handle engage with the adjacent ends of the front and rear adjusting levers, and a return spring is installed at the part where it disengages.

3. The handheld electric wire crimping pliers according to claim 2, characterized in that: The front support plate has an electric sliding groove and a spreading sliding groove extending along the drive shaft axis. The electric sliding groove forms a sliding pair through an electric ejection inclined surface on the surface adjacent to the motor drive block. One end of the motor drive block has an electric spreading inclined surface and a pressing protrusion on the surface opposite to the electric ejection inclined surface. The rear support plate has a manual sliding groove and a clearance groove extending along the axial direction of the drive shaft. The manual sliding groove and the manual guide protrusion on the adjacent surface of the manual drive block form a sliding pair. The manual drive block has a manual opening sliding groove and a manual release slope opposite to the pressing protrusion on the side adjacent to the motor drive block. When the pressure-off protrusion is misaligned with the manual disengagement ramp, the manual drive block tends to be in the manual engagement position under the action of the reset spring; when the pressure-off protrusion is engaged with the manual disengagement ramp, the manual drive block is in the manual disengagement position.

4. The handheld electric wire crimping pliers according to claim 3, characterized in that: The front adjusting lever is located outside the front support plate, and the rear adjusting lever is located outside the rear support plate.

5. The handheld electric wire crimping pliers according to claim 4, characterized in that: The front support plate and the rear support plate are equipped with a first micro switch for controlling the electric start forward rotation, a fourth micro switch for controlling the electric reverse rotation, a second micro switch for controlling the jaws to close to the position and stop, and a third micro switch for controlling the jaws to open to the position and stop.

6. The handheld electric wire crimping pliers according to claim 5, characterized in that: The front support plate and the rear support plate are fitted with front covers at one end near the jaws.

7. The handheld electric wire crimping pliers according to claim 6, characterized in that: A disc-shaped gasket is installed between the drive shaft and the motor drive block.

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