Piston oil tank having safety valve, and riveting tool

Abstract

Disclosed are a piston oil tank having a safety valve, and a riveting tool. The piston oil tank comprises a tank body (1) in which an isolation piston (2) is arranged, and further comprises an oil inlet (3) and a gas outlet (4) respectively arranged at front and rear ends of the isolation piston. The isolation piston (2) is provided with a safety valve core (5) passing through the isolation piston (2), a support bracket (6) is arranged at the end of the safety valve core (5) facing the gas outlet (4), and a limiting plate (7) is arranged at the end of the safety valve core (5) facing the oil inlet (3), the length of the safety valve core (5) being greater than that of the isolation piston (2); oil relief grooves (23) are arranged on the side wall of the safety valve core (5), and when the support bracket (6) is pressed on the end surface where the gas outlet (4) is located, the oil relief grooves (23) communicate spaces on front and rear sides of the isolation piston (2); and an oil outlet clearance (8) is reserved between the support bracket (6) and the end surface where the gas outlet (4) is located. The piston oil tank has a long service life and high safety.

Description

Piston type oil tank with safety valve and pull rivet tool TECHNICAL FIELD

[0001] The present application relates to the technical field of riveting tools, in particular to a piston type oil tank with a safety valve and a pull rivet tool. BACKGROUND

[0002] The existing electric hydraulic riveting tool, as described in the Chinese patent application with publication number CN115319009A, needs to be provided with an oil tank to store oil. The oil enters the riveting work head to push the work head piston in the riveting work head to move back and forth, thereby completing the pull riveting action.

[0003] The oil tank on the existing electric hydraulic riveting tool adopts a diaphragm type oil tank. A gas bag is arranged in the oil tank to communicate with the atmosphere, so that the oil in the oil tank can maintain pressure balance with the atmosphere and be separated from the atmosphere to avoid the mixing of gas in the oil to cause cavitation.

[0004] However, the oil pressure in the electric hydraulic riveting tool changes greatly instantaneously. When the pressure is instantaneously increased or decreased, the impact on the gas bag is great, which reduces the service life of the gas bag and even causes damage to the gas bag.

[0005] SUMMARY

[0006] The purpose of the present application is to provide a piston type oil tank with a safety valve and a pull rivet tool, which has a longer service life and is safer.

[0007] To solve the above technical problems, the present application adopts the following scheme:

[0008] In a first aspect, a piston type oil tank with a safety valve includes a tank body, a separation piston arranged in the tank body, an oil inlet arranged at the front end of the separation piston, and an air outlet arranged at the rear end of the separation piston. A sealing member is arranged between the separation piston and the tank body to separate the oil in the oil tank from the atmosphere. The separation piston replaces the gas bag and is less likely to be damaged due to its strong ability to withstand the impact caused by pressure changes, thereby prolonging the service life of the entire oil tank and reducing the frequency of maintenance. The oil inlet and the air outlet are arranged to allow the oil and the atmosphere to enter the oil tank, thereby balancing the pressure between the oil and the atmosphere on both sides of the separation piston. When the pressure of the oil in the oil tank is greater than that of the gas, the oil pushes the separation piston to move towards the air outlet. When the pressure of the oil in the oil tank is less than that of the gas, the gas pushes the separation piston to move towards the oil inlet.

[0009] Further, the safety valve core is provided on the isolation piston, and a support frame is arranged on the end of the safety valve core facing the air outlet, and a limiting plate is arranged on the end of the safety valve core facing the oil inlet, the length of the safety valve core is greater than the length of the isolation piston, and an oil discharging groove is arranged on the side wall of the safety valve core, the oil discharging groove connects the spaces on the front and back sides of the isolation piston in the state that the support frame is pressed on the end face where the air outlet is located, and an oil outlet gap is left between the support frame and the end face where the air outlet is located. The oil discharging groove extends along the axial direction of the safety valve core. The safety valve core, the support frame and the limiting plate can limit the movement range of the isolation piston on the safety valve core between the support frame and the limiting plate, and when the oil pressure in the oil tank is too high, the isolation piston is pushed to the end face where the air outlet is located, and when the support frame is pressed on the end face where the air outlet is located, the oil continues to push the isolation piston to move towards the air outlet, so that the limiting plate is separated from the end face of the isolation piston facing the oil inlet, and the front and back ends of the oil discharging groove are located on the front and back sides of the isolation piston respectively, so that the oil flows to the other side of the isolation piston through the oil discharging groove, and the oil with too high pressure is discharged through the air outlet, thereby reducing the oil pressure in the oil tank.

[0010] Further, the support frame and the isolation piston are provided with a reset spring sleeved outside the safety valve core. When the oil pressure in the oil tank is low, the reset spring can reset the isolation piston to the end of the safety valve core close to the limiting plate, so that the oil discharging groove is located on the side of the isolation piston facing the support frame, and the oil continues to flow out through the oil discharging groove.

[0011] Further, the safety valve core is provided on the isolation piston, and a support frame is arranged on the end of the safety valve core facing the air outlet, and a limiting plate is arranged on the end of the safety valve core facing the oil inlet, the length of the safety valve core is greater than the length of the isolation piston, and an oil discharging groove is arranged on the side wall of the safety valve core, the oil discharging groove connects the spaces on the front and back sides of the isolation piston in the state that the support frame is pressed on the end face where the air outlet is located, and an oil outlet gap is left between the support frame and the end face where the air outlet is located. The oil discharging groove extends along the axial direction of the safety valve core. The safety valve core, the support frame and the limiting plate can limit the movement range of the isolation piston on the safety valve core between the support frame and the limiting plate, and when the oil pressure in the oil tank is too high, the isolation piston is pushed to the end face where the air outlet is located, and when the support frame is pressed on the end face where the air outlet is located, the oil continues to push the isolation piston to move towards the air outlet, so that the limiting plate is separated from the end face of the isolation piston facing the oil inlet, and the front and back ends of the oil discharging groove are located on the front and back sides of the isolation piston respectively, so that the oil flows to the other side of the isolation piston through the oil discharging groove, and the oil with too high pressure is discharged through the air outlet, thereby reducing the oil pressure in the oil tank.

[0012] Further, the rear end of the tank body is provided with a rear cover plate, and the air outlet is arranged on the rear cover plate, and a positioning ring matched with the inner wall of the tank body is arranged on the end of the rear cover plate facing the isolation piston, and a rear support ring for supporting on the positioning ring is arranged on the end of the isolation piston facing the rear cover plate, and the inner diameter of the rear support ring is greater than the outer diameter of the support frame. The rear cover plate and the rear support ring can limit the movement distance of the isolation piston at the rear end of the tank body.

[0013] Further, the front end of the box body is provided with a front cover plate, the oil inlet is arranged on the front cover plate, a mounting seat for mounting the box body on the pull-riveting tool is arranged on the side surface of the front cover plate, the oil inlet extends from the mounting seat to the inside of the box body, the front cover plate is provided with an oil supplementing opening in communication with the box body, and an oil supplementing plug is arranged in the oil supplementing opening. The oil supplementing plug can be opened to supplement the oil in the oil tank when the oil pressure in the oil tank is low.

[0014] Further, a sealing pipe seat is arranged between the box body and the front cover plate, and a fastening rod for fixing the distance between the front cover plate and the rear cover plate is arranged between the front cover plate and the rear cover plate. The fastening rod comprises a rod body which is threadedly connected to the front cover plate and penetrates through the rear cover plate, and a fastening nut which is threadedly connected to the rod body and penetrates through the rear cover plate. The front cover plate, the sealing pipe seat, the box body and the rear cover plate are tightly connected through the fastening rod, so that the oil can not overflow from the connecting gap.

[0015] Further, a sleeve ring matched with the inner wall of the box body is arranged on the end surface of the sealing pipe seat facing the isolation piston, and a front supporting ring for supporting on the sleeve ring is arranged on the end surface of the isolation piston facing the front cover plate, and the outer diameter of the front supporting ring is larger than the inner diameter of the sleeve ring. The front end of the box body is limited in moving distance through the sleeve ring and the front supporting ring.

[0016] Further, a magnet is arranged on the side of the safety valve core facing the front cover plate, and a sensor for detecting the position of the magnet is arranged on the front cover plate. The sensor adopts the prior art, and will not be described herein. The sensor is triggered by the magnet when the oil in the oil tank is insufficient, and sends a signal of insufficient oil to the control system.

[0017] In the second aspect, the pull-riveting tool comprises the piston-type oil tank with a safety valve, and further comprises a pump body, and the box body is in communication with the pump body. The pump body is in communication with a riveting work head, and the pump body and the riveting work head adopt the prior art. The oil in the box body can enter the riveting work head through the pump body to serve as the medium for driving the work head piston in the riveting work head to move.

[0018] Further, the box body comprises a front cover plate, the oil inlet is arranged on the front cover plate, and a mounting seat is arranged on the side surface of the front cover plate and connected with the pump body.

[0019] The present application has the following beneficial effects:

[0020] 1. By using the isolation piston to replace the air bag, the isolation piston has strong ability to withstand the impact caused by pressure change and is not easy to be damaged, thereby prolonging the service life of the whole oil tank and reducing the maintenance frequency;

[0021] 2. By setting the oil outlet and the exhaust port, the oil and the atmosphere can enter the oil tank, and the pressure between the oil and the atmosphere on both sides of the isolation piston can be balanced. When the pressure of the oil in the oil tank is greater than that of the gas, the oil pushes the isolation piston to move towards the gas outlet direction. When the pressure of the oil in the oil tank is less than that of the gas, the gas pushes the isolation piston to move towards the oil inlet direction;

[0022] 3. By designing the safety valve core, the support frame and the limiting plate, the movement range of the isolation piston on the safety valve core can be limited between the support frame and the limiting plate. When the oil pressure in the oil tank is too high, the isolation piston is pushed towards the end face where the gas outlet is located. When the support frame is pressed on the end face where the gas outlet is located, the oil continues to push the isolation piston to move towards the gas outlet direction, so that the limiting plate is separated from the end face of the isolation piston towards the oil inlet, and the front and rear ends of the oil discharge groove are located on the front and rear sides of the isolation piston respectively, so that the oil flows to the other side of the isolation piston through the oil discharge groove, and the oil with too high pressure is discharged through the gas outlet, thereby reducing the oil pressure in the oil tank. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a schematic diagram of the exploded structure of the oil tank in embodiment 1;

[0024] Fig. 2 is a schematic diagram of the top view cross-sectional structure of the oil tank in embodiment 1 under low oil pressure;

[0025] Fig. 3 is a schematic diagram of the front view cross-sectional structure of the oil tank in embodiment 1 under high oil pressure;

[0026] Fig. 4 is a schematic diagram of the left view cross-sectional structure of the oil tank in embodiment 1 at the front cover plate;

[0027] Fig. 5 is a schematic diagram of the three-dimensional structure of the rear cover plate in embodiment 1;

[0028] Fig. 6 is a schematic diagram of the exploded structure of the pull-riveting tool in embodiment 1;

[0029] Fig. 7 is a schematic diagram of the three-dimensional structure of the safety valve core in embodiment 1.

[0030] 1, box; 2, isolation piston; 3, oil inlet; 4, gas outlet; 5, safety valve core; 6, support frame; 7, limiting plate; 8, oil outlet gap; 9, diameter expansion hole; 10, rear cover plate; 11, positioning ring; 12, rear support ring; 13, sealing ring; 14, front cover plate; 15, mounting seat; 16, sealing tube seat; 17, fastening rod; 18, collar; 19, front support ring; 20, pump body; 21, oil supplement port; 22, oil supplement plug; 23, oil discharge groove; 24, reset spring; 25, magnet; 26, sensor. DETAILED DESCRIPTION

[0031] The application will be further described below in conjunction with the embodiments and drawings, but the embodiments of the application are not limited thereto.

[0032] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0033] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "provided", "opened", "mounted", "connected", "linked" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be connected inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0034] Example 1

[0035] The first aspect, as shown in Figure 1, a piston type oil tank with a safety valve, comprising a tank body 1, the tank body 1 is provided with a separation piston 2, and further comprising an oil inlet 3 and an air outlet 4 respectively arranged at the front and rear ends of the separation piston 2. A sealing element is arranged between the separation piston 2 and the tank body 1 for separating the oil in the oil tank from the outside air, and the sealing element is located between the front support ring 19 and the rear support ring 12. Its function is that, by using the separation piston 2 to replace the air bag, the separation piston 2 has strong ability to withstand the impact caused by pressure change and is not easy to be damaged, thereby prolonging the service life of the whole oil tank and reducing the maintenance frequency; through the arrangement of the oil outlet and the air outlet, the oil and the atmosphere can enter the oil tank, which can be used to balance the pressure between the oil and the atmosphere on both sides of the separation piston 2, when the pressure of the oil in the oil tank is greater than the pressure of the gas, the oil pushes the separation piston 2 to move towards the air outlet 4, and when the pressure of the oil in the oil tank is less than the pressure of the gas, the gas pushes the separation piston 2 to move towards the oil inlet 3.

[0036] The separation piston 2 comprises a close-together segment close to the safety valve core 5, the separation piston 2 is provided with a give-way groove for the close-together segment to turn outward at the segment where the close-together segment is located, the give-way groove is arranged on the outer wall of the close-together segment, the outer wall of the separation piston 2 is provided with a sealing ring in interference fit with the inside of the tank body 1, the sealing ring is located between the front support ring 19 and the rear support ring 12, and the outer diameters of the front support ring 19 and the rear support ring 12 are smaller than the outer diameter of the sealing ring.

[0037] Specifically, as shown in Figure 2, the safety valve core 5 is arranged on the separation piston 2 in a penetrating manner and is arranged in parallel with the axial direction of the separation piston 2, the safety valve core 5 is provided with a support frame 6 at the end close to the air outlet 4, the safety valve core 5 is provided with a limiting plate 7 at the end close to the oil inlet 3, the length of the safety valve core 5 is greater than the length of the separation piston 2, the side wall of the safety valve core 5 is provided with an oil discharge groove 23, and in the state that the support frame 6 is pressed on the end face where the air outlet 4 is located, an oil discharge gap 8 is left between the support frame 6 and the end face where the air outlet 4 is located. The oil discharge groove 23 extends in the axial direction of the safety valve core 5. Its function is that, through the design of the safety valve core 5, the support frame 6 and the limiting plate 7, the movement range of the separation piston 2 on the safety valve core 5 can be limited between the support frame 6 and the limiting plate 7, when the oil pressure in the oil tank is too high, the separation piston 2 is pushed to the end face where the air outlet 4 is located, when the support frame 6 is pressed on the end face where the air outlet 4 is located, the oil continues to push the separation piston 2 to move towards the air outlet 4, the limiting plate 7 is separated from the end face of the separation piston 2 close to the oil inlet 3, and the front and rear ends of the oil discharge groove 23 are located on the front and rear sides of the separation piston 2 respectively, so that the oil flows to the other side of the separation piston 2 through the oil discharge groove 23, and the oil with too high pressure is discharged through the air outlet 4, thereby reducing the effect of the oil pressure in the oil tank being too high.

[0038] Specifically, as shown in FIG. 2, the support frame 6 and the isolation piston 2 are provided with a reset spring 24 sleeved outside the safety valve core 5. Its function is that, by the setting of the reset spring 24, when the oil pressure in the oil tank is low, the isolation piston 2 can be reset to the end of the safety valve core 5 close to the limiting plate 7, so that the oil drain groove 23 is located on the side of the isolation piston 2 facing the support frame 6, avoiding the oil from continuing to flow out through the oil drain groove 23.

[0039] Specifically, as shown in FIG. 3, the safety valve core 5 is provided with a sealing ring 13 on the section between the limiting plate 7 and the oil drain groove 23. During the process of shortening the distance between the isolation piston 2 and the support frame 6, the sealing ring 13 moves out of the isolation piston 2 to the outside of the isolation piston 2. The end of the isolation piston 2 facing the oil inlet 3 is provided with an enlarged hole 9 at the gap between the safety valve core 5 and the isolation piston 2, and the inner diameter of the enlarged hole 9 gradually decreases along the direction from the limiting plate 7 to the support frame 6. A groove for embedding the sealing ring 13 is provided around the outer wall of the safety valve core 5. Its function is that, by the setting of the sealing ring 13, the oil drain groove 23 can be further isolated from the oil when the sealing ring 13 is located in the isolation piston 2; because when the sealing ring 13 is located in the isolation piston 2, the sealing ring 13 is in a compressed state and tightly adheres to the inner wall of the isolation piston 2, by the setting of the enlarged hole 9, the sealing ring 13 can smoothly transition when it moves out of the isolation piston 2.

[0040] Specifically, as shown in FIG. 5, the rear end of the tank 1 is provided with a rear cover plate 10, and the air outlet 4 is arranged on the rear cover plate 10. The end surface of the rear cover plate 10 facing the isolation piston 2 is provided with a positioning ring 11 matched with the inner wall of the tank 1. The end surface of the isolation piston 2 facing the rear cover plate 10 is provided with a rear support ring 12 for supporting on the positioning ring 11, and the inner diameter of the rear support ring 12 is greater than the outer diameter of the support frame 6. Its function is that, by the setting of the rear cover plate 10 and the rear support ring 12, the rear end of the tank 1 can limit the movement distance of the isolation piston 2.

[0041] The rear cover plate 10 is provided with an oil discharge groove communicating with the air outlet 4, and the outer diameter of the oil discharge groove is smaller than the outer diameter of the support frame 6. The outer wall of the oil discharge groove is provided with an oil passing groove in communication. The oil passing groove is coaxially arranged with the isolation piston 2 and the support frame 6. The maximum distance between the oil passing groove and the center of the oil discharge groove is greater than the outer diameter of the support frame 6. The gap between the support frame 6 and the rear support ring 12, the gap between the oil passing groove and the support frame 6, and the oil discharge groove constitute the oil outlet gap 8.

[0042] Specifically, as shown in FIG. 4, the front end of the box 1 is provided with a front cover plate 14, the oil inlet 3 is arranged on the front cover plate 14, the side surface of the front cover plate 14 is provided with a mounting seat 15 for mounting the box 1 on the pull-riveting tool, the oil inlet 3 extends from the mounting seat 15 to the inside of the box 1, the front cover plate 14 is provided with an oil supplementing port in communication with the box 1, and the oil supplementing port is provided with an oil supplementing plug. The oil supplementing port and the oil supplementing plug are arranged to supplement the oil in the oil tank when the oil pressure in the oil tank is low.

[0043] Specifically, as shown in FIG. 3, the box 1 and the front cover plate 14 are provided with a sealing pipe seat 16, and the front cover plate 14 and the rear cover plate 10 are connected with a fastening rod 17 for fixing the distance between the front cover plate 14 and the rear cover plate 10. The fastening rod 17 comprises a rod body which is screwed on the front cover plate 14 and penetrates through the rear cover plate 10, and a fastening nut which is screwed on the rod body and penetrates through the rear cover plate 10. The fastening rod 17 is arranged to tightly connect the front cover plate 14, the sealing pipe seat 16, the box 1 and the rear cover plate 10, so as to prevent the oil from overflowing from the connecting gap.

[0044] Specifically, as shown in FIG. 3, the end surface of the sealing pipe seat 16 facing the isolation piston 2 is provided with a sleeve 18 matched with the inner wall of the box 1, and the end surface of the isolation piston 2 facing the front cover plate 14 is provided with a front supporting ring 19 supported on the sleeve 18, and the outer diameter of the front supporting ring 19 is greater than the inner diameter of the sleeve 18. The sleeve 18 and the front supporting ring 19 are arranged to limit the moving distance of the isolation piston 2 at the front end of the box 1.

[0045] Specifically, as shown in FIG. 2, the side of the safety valve core 5 facing the front cover plate 14 is provided with a magnet 25, and the front cover plate 14 is provided with a sensor 26 for detecting the position of the magnet 25. The sensor 26 is of the prior art, and will not be described herein. The magnet 25 and the sensor 26 are arranged to trigger the sensor 26 when the oil amount in the oil tank is insufficient, and send a signal of insufficient oil amount to the control system.

[0046] In the second aspect, a pull-riveting tool comprises the above-mentioned piston-type oil tank with a safety valve, and further comprises a pump body 20, and the box 1 is in communication with the pump body 20. The pump body 20 is in communication with a riveting work head, and the pump body 20 and the riveting work head are of the prior art. The box 1 is in communication with the pump body 20, and the pump body 20 is in communication with the riveting work head, so that the oil in the box 1 can enter the riveting work head through the pump body 20 to serve as a medium for driving the work head piston in the riveting work head to move.

[0047] The box 1 comprises a front cover plate 14, the oil inlet 3 is arranged on the front cover plate 14, and a mounting seat 15 is arranged on the side of the front cover plate 14, and the mounting seat 15 is connected with the pump body 20.

[0048] The working principle of the embodiment is explained as follows: when the rivet working head performs the rivet pulling work, the oil pressure in the pump body 20 changes, thereby affecting the oil pressure in the oil tank, and when the oil pressure in the oil tank is balanced with the atmospheric pressure, the isolation piston 2 keeps still;

[0049] When the oil pressure in the oil tank is too high, the oil pushes the isolation piston 2 to the air outlet 4, and when the isolation piston 2 moves from the position close to the limiting plate 7 to the support frame 6 on the safety valve core 5, the sealing ring 13 and the one end of the oil discharge groove 23 close to the limiting plate 7 are moved out of the expansion hole 9 in sequence, so that the oil discharge groove 23 connects the front and rear ends of the isolation piston 2, discharges the appropriate oil, reduces the oil pressure, and enhances the safety of the rivet pulling tool.

[0050] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. According to the technical essence of the present application, any simple modification, equivalent replacement and improvement of the above embodiment within the spirit and principle of the present application are still within the protection scope of the technical scheme of the present application.

Claims

1. A piston tank with a safety valve, comprising a tank body (1), characterised in that: The box (1) is internally provided with a separation piston (2), and further comprises an oil inlet (3) and an air outlet (4) respectively arranged at the front and rear ends of the separation piston (2).

2. A piston tank with a safety valve according to claim 1, characterized in that: The safety valve core (5) is arranged in the separation piston (2) and is parallel to the axial direction of the separation piston (2), and the safety valve core (5) is provided with a support frame (6) at one end facing the air outlet (4) and a limiting plate (7) at the other end facing the oil inlet (3), the length of the safety valve core (5) is greater than the length of the separation piston (2), and the side wall of the safety valve core (5) is provided with an oil discharging groove (23), the oil discharging groove (23) connects the spaces on the front and rear sides of the separation piston (2) in the state that the support frame (6) is pressed on the end face where the air outlet (4) is arranged, and an oil outlet gap (8) is left between the support frame (6) and the end face where the air outlet (4) is arranged.

3. A piston tank with a safety valve according to claim 2, characterized in that: The support frame (6) and the separation piston (2) are provided with a reset spring (24) arranged outside the safety valve core (5).

4. A piston tank with a safety valve according to claim 3, characterized in that: The safety valve core (5) is provided with a sealing ring (13) on the section between the limiting plate (7) and the oil discharging groove (23), the sealing ring (13) is moved out of the separation piston (2) and is arranged outside the separation piston (2) in the process that the distance between the separation piston (2) and the support frame (6) is shortened, the separation piston (2) is provided with an enlarged hole (9) at the gap between the safety valve core (5) and the separation piston (2) at one end facing the oil inlet (3), and the inner diameter of the enlarged hole (9) gradually decreases in the direction from the limiting plate (7) to the support frame (6).

5. A piston tank with a safety valve according to claim 4, characterized in that: The rear end of the box (1) is provided with a rear cover plate (10), the air outlet (4) is arranged on the rear cover plate (10), the end face of the rear cover plate (10) facing the separation piston (2) is provided with a positioning ring (11) matched with the inner wall of the box (1), and the end face of the separation piston (2) facing the rear cover plate (10) is provided with a rear support ring (12) arranged on the positioning ring (11), and the inner diameter of the rear support ring (12) is greater than the outer diameter of the support frame (6).

6. A piston tank with a safety valve according to claim 5, characterized in that: The front end of the box (1) is provided with a front cover plate (14), the oil inlet (3) is arranged on the front cover plate (14), the side face of the front cover plate (14) is provided with a mounting seat (15) for mounting the box (1) on a pull-riveting tool, the oil inlet (3) extends from outside the mounting seat (15) into the box (1), the front cover plate (14) is provided with an oil supplementing opening (21) in communication with the box (1), and the oil supplementing opening (21) is provided with an oil supplementing plug (22).

7. A piston tank with a safety valve according to claim 6, characterized in that: The box (1) and the front cover plate (14) are provided with a sealing pipe seat (16), and the front cover plate (14) and the rear cover plate (10) are connected with a fastening rod (17) for fixing the distance between the front cover plate (14) and the rear cover plate (10).

8. A piston tank with a safety valve according to claim 7, characterized in that: The end face of the sealing pipe seat (16) facing the separation piston (2) is provided with a sleeve ring (18) matched with the inner wall of the box (1), and the end face of the separation piston (2) facing the front cover plate (14) is provided with a front support ring (19) arranged on the sleeve ring (18), and the outer diameter of the front support ring (19) is greater than the inner diameter of the sleeve ring (18).

9. A piston tank with a safety valve according to claim 7, characterized in that: The safety valve core (5) is provided with a magnet (25) on the side facing the front cover plate (14), and the front cover plate (14) is provided with a sensor (26) for detecting the position of the magnet (25).

10. A pull-rivet tool characterized by: The piston oil tank with the safety valve comprises a pump body (20), and the tank body (1) is communicated with the pump body (20); the tank body (1) comprises a front cover plate (14), the oil inlet (3) is arranged on the front cover plate (14), and a mounting seat (15) is arranged on the side of the front cover plate (14) and connected with the pump body (20).

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