Riveting tool capable of detecting tension value

Abstract

A rivet pulling tool capable of detecting a pulling force value comprises a gun body, a pressure cylinder, a piston barrel, a rotary driving device, a gun head, a pulling force sensor and a controller, the controller comprises a power source, a control circuit and an electromagnetic valve, the rotary driving device, the pulling force sensor and the electromagnetic valve are all electrically connected with the control circuit, and the control circuit is electrically connected with the power source. The piston barrel is movably arranged in the gun body, the pressure cylinder is communicated with the interior of the gun body through an electromagnetic valve, the piston barrel is fixedly connected with a part of the rotary driving device, the rotary driving device is connected with the gun head, and the tension sensor is located on the peripheral side of the rotary driving device. According to the rivet pulling tool, the tension sensor is arranged on the peripheral side of the rotary driving device, and the rotary driving device is directly connected with the gun head, so that the value of tension borne by the gun head can be accurately detected, the time for stopping rivet pulling is accurately controlled, and the rivet pulling quality is ensured.

Description

Technical Field

[0001] The utility model relates to a riveting tool, in particular to a riveting tool capable of detecting the tensile force value. Background Art

[0002] A riveting tool is a tool used in conjunction with a riveting nut and is widely used in fastening operations in fields such as trains, automobiles, and bridges. When in use, first pass the riveting nut through the through-hole of the workpiece to be riveted, then rotate the gun head of the riveting tool to thread it with the riveting nut, then pull the gun head backward to deform the riveting nut, the deformed position of the riveting nut and the riveting nut head jointly press the workpiece, and finally rotate the gun head in the reverse direction to withdraw it from the riveting nut.

[0003] Existing riveting tools generally control the riveting distance of the gun head by setting a stroke. During the process of pulling the gun head, the farther the position of the gun head is backward, the greater the tensile force it receives. When the tensile force is too large, it may cause the problem of excessive deformation and damage of the riveting nut. Moreover, in the case of excessive deformation of the riveting nut, the gun head may not be able to withdraw smoothly; when the tensile force is too small, the riveting nut does not fully press the workpiece, and the workpiece may become loose.

[0004] To solve the above problems, some riveting tools are provided with a mechanism for detecting the riveting force. For example, the integrated hand-held electric hydraulic riveting tool disclosed in Chinese invention CN115319009A has a hydraulic sensor in its hydraulic system. When the hydraulic value in the hydraulic system reaches a set value, it is determined that the pressure of the gun head reaches a predetermined value. At this time, the gun head is controlled to move in the reverse direction through an electromagnetic commutator to avoid damaging the rivet.

[0005] However, the hydraulic value in the hydraulic system does not truly reflect the actual pressure value of the gun head. Specifically, the hydraulic value is actually the magnitude of the force of interaction between the piston and the hydraulic oil, and there are usually multiple components between the piston and the gun head. There are manufacturing errors between the components. At the same time, this hydraulic value also needs to be calculated in combination with the hydraulic area to obtain the pressure value of the gun head, and there are also errors in the hydraulic area. Therefore, there may be a large difference between the tensile force value calculated from the hydraulic value and the actual tensile force value.

[0006] In addition, for a riveting tool used in conjunction with a riveting nut, in addition to controlling the start and stop of the riveting action, it is also necessary to control the rotation action of the gun head, and precise coordination of the two actions is required to effectively avoid the situation of excessive or too small tensile force. Currently, some riveting tools only control the start and stop of the riveting action through sensors and do not control the rotation action, and thus cannot effectively improve the riveting quality. Summary of the Utility Model

[0007] In order to overcome the drawbacks and deficiencies existing in the prior art, the purpose of the present utility model is to design a riveting tool capable of detecting the tensile force value, which can detect the tensile force value of the gun head in real time and accurately control the riveting force.

[0008] To achieve the above object, the present utility model provides a riveting tool capable of detecting the tensile force value, comprising: a gun body, a pressure cylinder, a piston cylinder, a rotary drive device, a gun head and a controller. The controller comprises: a power supply, a control circuit and a solenoid valve. The rotary drive device and the solenoid valve are both electrically connected to the control circuit. The control circuit is electrically connected to the power supply. The piston cylinder is movably arranged inside the gun body. The pressure cylinder is communicated with the inside of the gun body through the solenoid valve to provide power for the movement of the piston cylinder. A part of the piston cylinder is fixedly connected to a part of the rotary drive device. The rotary drive device is connected to the gun head to drive the gun head to rotate. The riveting tool further comprises: a tensile force sensor, which is electrically connected to the control circuit and is located on the periphery of the rotary drive device to detect the tensile force value of the gun head.

[0009] Furthermore, the gun body is provided with a pressure chamber and a movable chamber. The pressure chamber is located at the rear side of the movable chamber. A part of the gun head and the tensile force sensor are both located in the movable chamber. The piston cylinder comprises: a cylinder body, and the cylinder body is provided with a piston part. The piston part is located in the pressure chamber and divides the pressure chamber into a first chamber and a second chamber. The pressure cylinder is communicated with the first chamber through the solenoid valve. The second chamber is communicated with the movable chamber. Among them, the change of pressure in the first chamber will generate a force on the piston part, thereby promoting the movement of the cylinder body. After the second chamber is communicated with the movable chamber, it is communicated with the atmosphere, thereby providing a force opposite to that of the first chamber.

[0010] Furthermore, the gun body is further provided with a hand-held part, which is located below the pressure chamber. The hand-held part is provided with a trigger for driving the power supply. The pressure cylinder is located directly below the hand-held part and is fixedly connected to the hand-held part. Among them, the setting of the hand-held part can facilitate the user to hold the riveting tool for operation. Setting the pressure cylinder directly below the hand-held part can make the center of gravity of the riveting tool and the hand-held part located in the same vertical position, making it more labor-saving for the user to hold.

[0011] Furthermore, the piston cylinder further comprises: a sealing ring, which is arranged around the piston part and contacts the inner surface of the pressure chamber. Among them, the setting of the sealing ring can achieve a sealing effect and avoid the pressure leakage of the first chamber.

[0012] Furthermore, the riveting tool further comprises: a guide sleeve, which is arranged around the cylinder body. Among them, the setting of the guide sleeve can support the cylinder body and make the movement of the cylinder body smoother.

[0013] Furthermore, the piston cylinder further includes: a dust-proof ring, which is arranged around the cylinder body and fixed inside the guide sleeve. Among them, the setting of the dust-proof ring can prevent external dust from entering the second chamber and avoid the obstruction of the movement of the cylinder body.

[0014] Furthermore, the rotary driving device includes: a motor, a movable rod, and a rod sleeve. The motor shaft of the motor, the movable rod, the rod sleeve, and the gun head are sequentially detachably and fixedly connected. The housing of the motor is located inside the cylinder body. The motor is electrically connected to the control circuit. The tension sensor is located on the periphery of the movable rod. Among them, since the movable rod, the rod sleeve, and the gun head are sequentially detachably and fixedly connected, when the above-mentioned components are damaged, they can be replaced separately, reducing the replacement cost.

[0015] Furthermore, the riveting tool further includes: a bearing, and the inner ring and the outer ring of the bearing are respectively in contact with the inner surface of the rod sleeve and the movable cavity. Among them, the setting of the bearing can support the rod sleeve and make the rotation of the rod sleeve smoother.

[0016] Furthermore, the piston cylinder further includes: an end cover, which detachably seals the port at the rear end of the cylinder body. Among them, when it is necessary to repair the motor, the end cover can be removed to open the cylinder body, so as to take out the motor.

[0017] Furthermore, the power line of the motor passes through the end cover and is electrically connected to the control circuit. Among them, the end cover is provided with a wiring hole through which the power line passes. Before installing the motor, the power line can be passed through the end cover first, and then the motor is installed and the end cover is sealed.

[0018] After adopting the above technical solutions, the beneficial effects are as follows: Since the tension sensor is arranged on the periphery of the rotary driving device of the riveting tool of the present invention, and the rotary driving device is directly connected to the gun head, the tension value received by the gun head can be accurately detected, the timing of stopping riveting can be accurately controlled, and the riveting quality can be ensured. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the riveting tool related to the present invention;

[0020] Figure 2 It is a sectional view of the riveting tool related to the present invention;

[0021] Figure 3 It is a partial enlarged view of the riveting tool related to the present invention at circle A;

[0022] Figure 4 It is a partial enlarged view of the riveting tool related to the present invention at circle B.

[0023] The reference numerals are: 1, gun body; 11, pressure chamber; 12, movable chamber; 13, handheld part; 2, pressure cylinder; 3, piston cylinder; 30, piston part; 31, sealing ring; 32, dust-proof ring; 33, end cap; 4, rotary drive device; 41, motor; 42, movable rod; 43, rod sleeve; 5, gun head; 6, tension sensor; 7, controller; 8, guide sleeve; 9, bearing. Detailed implementation manners

[0024] The technical solution of the present utility model will be further described below through embodiments:

[0025] The present utility model provides a riveting tool capable of detecting a tensile value. As shown in combination with Figures 1 - 2 , the riveting tool includes: a gun body 1, a pressure cylinder 2, a piston cylinder 3, a rotary drive device 4, a gun head 5, a tension sensor 6, a controller 7, a guide sleeve 8, and a bearing 9. The piston cylinder 3 is movably disposed inside the gun body 1. The pressure cylinder 2 is communicated with the inside of the gun body 1 through the controller 7 to provide power for the movement of the piston cylinder 3. A part of the piston cylinder 3 is fixedly connected to the rotary drive device 4. The rotary drive device 4 is connected to the gun head 5 to drive the gun head 5 to rotate. The tension sensor 6 is located inside the gun body 1 and on the periphery of the rotary drive device 4 to detect the tensile value of the gun head 5. Both the rotary drive device 4 and the tension sensor 6 are electrically connected to the controller 7. The guide sleeve 8 is disposed around the piston cylinder 3 and fixed inside the gun body 1. The inner ring and the outer ring of the bearing 9 are respectively in contact with the rotary drive device 4 and the gun body 1.

[0026] When using the above-mentioned riveting tool, first, use the controller 7 to control the rotary drive device 4 to drive the gun head 5 to rotate forward, and at the same time, manually push the gun body 1 forward so that the gun head 5 is screwed to the riveting nut. Then, use the controller 7 to control the pressure cylinder 2 to provide negative pressure inside the gun body 1, so as to cause the piston cylinder 3 to move backward relative to the gun body 1, thereby driving the rotary drive device 4 and the gun head 5 to move backward, and further deforming the riveting nut to clamp the workpiece. Next, use the controller 7 to control the pressure cylinder 2 to provide positive pressure inside the gun body 1, so as to cause the piston cylinder 3 to move forward relative to the gun body 1, so that the gun head 5 returns to the initial position. At this time, in fact, the gun body 1 moves backward relative to the gun head 5, and the gun head 5 does not move relative to the riveting nut. Finally, use the controller 7 to control the rotary drive device 4 to drive the gun head 5 to rotate backward, and at the same time, manually pull the gun body 1 backward, so that the gun head 5 withdraws from the riveting nut.

[0027] The above working principle is the same as that of the prior art and will not be elaborated in detail here. Different from the prior art, the riveting tool of the present utility model directly detects the tensile value received by the gun head 5 by using the tension sensor 6. When the tensile value reaches a predetermined value, use the controller 7 to control the gun head 5 to return to the initial position relative to the gun body 1, and then rotate backward, so as to avoid the situation of excessive or too small tensile force.

[0028] In this embodiment, the pressure cylinder 2 is a pneumatic cylinder, and the movement of the piston cylinder 3 is controlled by blowing air or sucking air in the gun body 1, so as to control the movement of the gun head 5. In other embodiments, the pressure cylinder 2 can also be a hydraulic cylinder, and the movement of the piston cylinder 3 is controlled by supplying oil or pumping oil in the gun body 1, so as to control the movement of the gun head 5.

[0029] Specifically, the controller 7 includes: a power supply, a control circuit and a solenoid valve. The rotation driving device 4, the tension sensor 6 and the solenoid valve are all electrically connected to the control circuit, the control circuit is electrically connected to the power supply, and the pressure cylinder 2 is communicated with the gun body 1 through the solenoid valve. During operation, the rotation driving device 4, the tension sensor 6 and the solenoid valve are powered; the solenoid valve controls the pressure cylinder to provide positive pressure or negative pressure; the control circuit controls the rotation direction of the rotation driving device 4 and the pressure direction of the solenoid valve according to the electrical signal of the tension sensor 6. Among them, the principle of the control circuit controlling the rotation driving device 4 and the solenoid valve is the same as that of the prior art and will not be elaborated here. Different from the prior art, the control circuit uses the electrical signal of the tension sensor 6 as the signal for controlling the reverse rotation of the rotation driving device 4.

[0030] In this embodiment, the control circuit of the controller 7 is an internal circuit. In other embodiments, an external detector can also be used as the control circuit to control the motor 41 and the solenoid valve.

[0031] More specifically, the gun body 1 is provided with a pressure chamber 11, a movable chamber 12 and a hand-held part 13. The pressure chamber 11 is located at the rear side of the movable chamber 12 and is communicated with the movable chamber 12. The hand-held part 13 is located below the pressure chamber 11. The hand-held part 13 is provided with a trigger for driving the power supply. The piston cylinder 3 is movably arranged in the pressure chamber 11 and the movable chamber 12. The pressure cylinder 2 is located directly below the hand-held part 13 and is fixedly connected to the hand-held part 13. The pressure cylinder 2 is communicated with the pressure chamber 11 through the solenoid valve. A part of the gun head 5 and the tension sensor 6 are both located in the movable chamber 12. During use, when the trigger is pulled, the controller 7 is used to control the pressure cylinder 2 to provide positive pressure or negative pressure to the pressure chamber 11, so as to cause the gun head 5 to move relative to the movable chamber 12.

[0032] More specifically, in combination with Figures 2 - 3As shown in the figure, the piston cylinder 3 includes: a cylinder body, a sealing ring 31, a dust-proof ring 32 and an end cover 33. The cylinder body is provided with a piston portion 30. The piston portion 30 is located in the pressure chamber 11 and divides the pressure chamber 11 into a first chamber and a second chamber. The pressure cylinder 2 is communicated with the first chamber through an electromagnetic valve. The second chamber is communicated with the movable chamber 12. The sealing ring 31 is arranged around the piston portion 30 and contacts the inner surface of the pressure chamber 11. The guide sleeve 8 is arranged around the cylinder body. The dust-proof ring 32 is arranged around the cylinder body and fixed inside the guide sleeve 8. The end cover 33 detachably seals the port at the rear end of the cylinder body. The power line of the rotary driving device 4 passes through the end cover 33 and is electrically connected to the control circuit. During use, the piston portion 30 moves in the pressure chamber 11, and the cylinder body moves relative to the guide sleeve 8.

[0033] In this embodiment, the sealing ring 31 is a gas seal for isolating the gas flow between the first chamber and the second chamber. In other embodiments, when the pressure cylinder 2 is a hydraulic cylinder, the sealing ring 31 is an oil seal for isolating the liquid flow between the first chamber and the second chamber.

[0034] More specifically, in combination with Figure 2 and 4 As shown in the figure, the rotary driving device 4 includes: a motor 41, a movable rod 42 and a rod sleeve 42. The motor shaft of the motor 41, the movable rod 42, the rod sleeve 42 and the gun head 5 are sequentially detachably and fixedly connected. The housing of the motor 41 is located inside the cylinder body. The power line of the motor 41 passes through the end cover 33 and is electrically connected to the control circuit. The tensile force sensor 6 is located on the periphery of the movable rod 42. The inner ring and the outer ring of the bearing 9 are respectively in contact with the rod sleeve 42 and the inner surface of the movable chamber 12. During use, the controller 7 is used to drive the motor 41, so as to control the rotation of the movable rod 42, the rod sleeve 42 and the gun head 5, and the tensile force sensor 6 detects the acting force received by the movable rod 42.

Claims

1. A riveting tool capable of detecting the pulling force value, comprising: A riveting tool comprising a gun body, a pressure cylinder, a piston cylinder, a rotary drive device, a gun head and a controller. The controller includes: a power supply, a control circuit and a solenoid valve. The rotary drive device and the solenoid valve are both electrically connected to the control circuit. The control circuit is electrically connected to the power supply. The piston cylinder is movably disposed inside the gun body. The pressure cylinder communicates with the inside of the gun body through the solenoid valve to provide power for the movement of the piston cylinder. The piston cylinder is fixedly connected to a part of the rotary drive device. The rotary drive device is connected to the gun head to drive the gun head to rotate. It is characterized in that: the riveting tool further includes: a tensile force sensor, the tensile force sensor is electrically connected to the control circuit, and the tensile force sensor is located on the periphery of the rotary drive device to detect the tensile force value of the gun head.

2. The riveting tool capable of detecting the tensile force value according to claim 1, wherein: The gun body is provided with a pressure chamber and a movable chamber. The pressure chamber is located at the rear side of the movable chamber. A part of the gun head and the tensile force sensor are both located in the movable chamber. The piston cylinder includes: a cylinder body, the cylinder body is provided with a piston part, the piston part is located in the pressure chamber and divides the pressure chamber into a first chamber and a second chamber. The pressure cylinder communicates with the first chamber through the solenoid valve, and the second chamber communicates with the movable chamber.

3. The riveting tool capable of detecting the tensile force value according to claim 2, wherein: The gun body is further provided with a handheld part. The handheld part is located below the pressure chamber. The handheld part is provided with a trigger for driving the power supply. The pressure cylinder is located directly below the handheld part and is fixedly connected to the handheld part.

4. The riveting tool capable of detecting the pulling force value according to claim 2, wherein: The piston cylinder further includes: a sealing ring, the sealing ring is disposed around the piston part and contacts the inner surface of the pressure chamber.

5. The riveting tool capable of detecting the tensile force value according to claim 2, characterized in that: The riveting tool further includes: a guide sleeve, the guide sleeve is disposed around the cylinder body.

6. The riveting tool capable of detecting the tensile force value according to claim 5, characterized in that: The piston cylinder further includes: a dust-proof ring, the dust-proof ring is disposed around the cylinder body and fixed inside the guide sleeve.

7. The riveting tool capable of detecting the pulling force value according to claim 2, characterized in that: The rotary drive device includes: a motor, a movable rod and a rod sleeve. The motor shaft of the motor, the movable rod, the rod sleeve and the gun head are sequentially detachably and fixedly connected. The housing of the motor is located inside the cylinder body. The motor is electrically connected to the control circuit. The tensile force sensor is located on the periphery of the movable rod.

8. The riveting tool capable of detecting the tensile force value according to claim 7, wherein: The riveting tool further includes: a bearing, the inner ring and the outer ring of the bearing respectively contact the rod sleeve and the inner surface of the movable chamber.

9. The riveting tool capable of detecting the tensile force value according to claim 1, characterized in that: The piston cylinder further includes: an end cover, the end cover detachably seals the port at the rear end of the cylinder body.

10. The riveting tool capable of detecting the tensile force value according to claim 7, wherein: The power line of the motor passes through the end cover and is electrically connected to the control circuit.

Images