High-pressure oil supply system for hydraulic riveting

Abstract

The invention discloses a high-pressure oil supply system for hydraulic riveting. The system comprises an electric control system and a hydraulic power system. The electric control system and the hydraulic power system are arranged on the moving device; the hydraulic power system comprises two motors and two hydraulic pump sets coaxially driven by the two motors respectively. Each hydraulic pump set comprises a low-pressure large-flow pump and two high-pressure small-flow pumps; the low-pressure large-flow pumps in each set suck hydraulic oil through the oil tank and supply the hydraulic oil to the two high-pressure small-flow pumps in the same set, and the two high-pressure small-flow pumps in the two sets respectively provide power hydraulic oil for the hydraulic control oil way and power hydraulic oil for the riveting tool after being connected in parallel. According to the system, two motors are adopted to drive two sets of three coaxial hydraulic pumps, two-stage pump station pressurization large-flow oil supply is achieved, and the rated pressure of 150 MPa can be provided; the system is compact in structure, safe and reliable, the requirement of a hydraulic riveting tool for an ultrahigh-pressure hydraulic riveting system in the prior art can be met, and a foundation can be laid for light weight of an existing hydraulic riveting tool.

Description

Technical Field

[0001] The present invention belongs to the field of riveting and fastening technology, in particular to the field of riveting and fastening equipment design and manufacturing technology, and particularly relates to a hydraulic tool technology for rivet fastening connection equipment, belongs to the riveting category (B21J), and specifically is a high-pressure oil supply system for hydraulic riveting. Background Art

[0002] A pull rivet is a fastener invented using the unidirectional tensile principle of Hooke's law to prevent loosening. It is the collective name for rivets and collars. Rivets are equivalent to the bolts of bolted joints. The main difference is that rivets do not have thread grooves, but instead have circles of annular grooves. The collar is equivalent to the nut of a bolted joint. The main difference is that the inner hole surface of the collar does not have internal threads, but a smooth surface. When installing the pull rivet, a special riveting tool is used to squeeze the metal material of the collar into the annular groove of the rivet to achieve a permanent connection. Therefore, during the use of pull rivet fasteners, the riveting tool needs to provide a large riveting force. In order to meet the needs of different usage scenarios, the size and specifications of existing pull rivet fasteners are constantly increasing, and the required riveting force is also increasing sharply.

[0003] The riveting force is determined by the cylinder area of ​​the riveting tool and the oil pressure. The existing hydraulic riveting pump can only provide a maximum oil pressure of 70MPa. When the oil pressure is determined, the increase in riveting force will inevitably increase the cylinder area of ​​the riveting tool, and then the volume and weight of the riveting tool will continue to increase, which will increase the burden on workers using the riveting tool and reduce work efficiency. In order to improve work efficiency and reduce the burden on workers, the riveting tool must be lightweight, so it is imperative to design and manufacture an ultra-high pressure hydraulic riveting system. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention discloses a high-pressure oil supply system for hydraulic riveting. The high-pressure oil supply system for hydraulic riveting of the present invention has a rated pressure of up to 150MPa, a compact structure, safety and reliability, and can meet the requirements of hydraulic riveting tools for ultra-high pressure hydraulic riveting systems.

[0005] In order to achieve the above object, the present invention adopts the following scheme:

[0006] A high-pressure oil supply system for hydraulic riveting, the high-pressure oil supply system provides hydraulic oil power for the hydraulic riveting tool to achieve riveting; the characteristics are: the high-pressure oil supply system includes an electronic control system and a hydraulic power system; the electronic control system and the hydraulic power system are arranged on a mobile device composed of a wheeled trolley and a pump station support frame;

[0007] The electric control system includes an electric control cabinet composed of a touch screen, a PLC, and a relay, and also includes a pressure sensor and a temperature control sensor arranged on each oil line, oil pipe, and oil tank;

[0008] The hydraulic power system includes two motors and two groups of hydraulic pump groups; each group of hydraulic pump groups includes three coaxial hydraulic pumps, and the three coaxial hydraulic pumps are a low-pressure large-flow pump and two high-pressure small-flow pumps; one motor drives three coaxial hydraulic pumps in one group of hydraulic pump groups; the low-pressure large-flow pump of each group draws hydraulic oil from the oil tank and supplies it to the two high-pressure small-flow pumps in the same group, realizing two-stage pump station booster oil supply; a high-pressure small-flow pump of one group is connected in parallel with the output end of a high-pressure small-flow pump of another group to provide power hydraulic oil for the hydraulic control oil circuit, and another high-pressure small-flow pump of one group is connected in parallel with the output end of another high-pressure small-flow pump of another group to provide power hydraulic oil for the riveting tool.

[0009] The electronic control system is further used to set or change the riveting pressure and riveting mode through the touch display screen, and display the current working pressure in real time; at the same time, the hydraulic oil temperature of the oil tank is monitored in real time through the temperature control sensor, and the equipment will be shut down to protect it if the maximum limit temperature is exceeded.

[0010] Furthermore, the electronic control system controls the two motors to start and run synchronously, controls the switching of the hydraulic control oil circuit and the switching of the riveting oil circuit through the three-position four-way electromagnetic reversing valve, and realizes the single button control of the riveting tool hydraulic riveting system.

[0011] Furthermore, the hydraulic power system is provided with a filter and a radiator; the filter includes an internal or external type, and the filtering accuracy includes a coarse filter or a fine filter, so as to filter impurities in the oil and protect the pump station equipment; the radiator includes air cooling, water cooling or oil cooling, so as to reduce the oil temperature and realize continuous operation of the equipment.

[0012] Furthermore, the motor used in the hydraulic power system is a servo motor, a stepper motor or a special motor; the hydraulic pump used is a plunger hydraulic pump or a gear hydraulic pump, and the plunger hydraulic pump heads are distributed in a single plane, or distributed in parallel on multiple planes; the hydraulic power system is provided with a main oil tank, and each pressure relief oil pipe is connected to the return flow of the main oil tank, and each hydraulic pump is fully immersed in the main oil tank.

[0013] Furthermore, the first overflow valve of the hydraulic power system is a low-pressure, large-flow pump low-pressure oil circuit safety valve, which is used to limit the maximum pressure of the low-pressure oil circuit. The low-pressure oil circuit is also provided with a unloading solenoid valve and a pressure sensor to realize pressure monitoring and safe pressure relief; the second overflow valve of the hydraulic power system is a high-pressure, small-flow pump high-pressure hydraulic control oil circuit safety valve, which is used to limit the maximum pressure of the hydraulic control oil circuit to realize safe pressure relief; the third overflow valve of the hydraulic power system is another high-pressure, small-flow pump high-pressure riveting oil circuit pressure regulating valve, which is used to set the corresponding riveting pressure. The high-pressure riveting oil circuit is also provided with a pressure sensor, a pressure gauge and an emergency unloading valve to realize pressure monitoring and safe pressure relief of the oil circuit in an emergency.

[0014] Furthermore, the hydraulic power system adopts a horizontal shaft output structure or a vertical shaft output structure.

[0015] Furthermore, the pressure relay of the electric control system is used to send a signal to the pressure relief system to resume standby after detecting that the pistons of the rod chamber and the rodless chamber of the riveting tool are reset.

[0016] Furthermore, the input end of the low-pressure, high-flow pump of the hydraulic power system is connected to a filter to absorb oil from a main oil tank, and the output end oil circuit is directly connected to the input ends of two coaxially driven high-pressure, low-flow pumps, a relief valve 1 and a unloading solenoid valve; the output end of one group of high-pressure, low-flow pumps is connected in parallel with the output end of another group of high-pressure, low-flow pumps, and then connected to the relief valve 2 and the inlet of the three-position, four-way solenoid reversing valve, and then connected to the pressurizing valve and the hydraulically controlled one-way valve through the three-position, four-way solenoid reversing valve; the output end of another group of high-pressure, low-flow pumps is connected to the front end of the one-way valve, and the other end of the one-way valve is connected in parallel with the one-way valve connected to the output end of another high-pressure, low-flow pump of another group, and then connected to the relief valve 3, the pressure gauge and the inlet end of the pressurizing valve, and the other end of the pressurizing valve is connected to the hydraulically controlled one-way valve, the riveting tool and the emergency unloading valve.

[0017] Furthermore, the low-pressure oil circuit, high-pressure hydraulic control oil circuit and high-pressure riveting oil circuit of the hydraulic power system are each provided with one or more pressure sensors for monitoring the real-time pressure of the oil circuit; the main oil tank or each high and low-pressure oil circuit is provided with one or more temperature sensors for monitoring the real-time temperature of the oil.

[0018] The high-pressure oil supply system for hydraulic riveting of the present invention has the following beneficial effects:

[0019] The system of the present invention uses dual motors to drive two groups of three coaxial hydraulic pumps to achieve two-stage pump station pressurized large flow oil supply, which can provide a rated pressure of 150MPa. The system has a compact structure, is safe and reliable, can meet the requirements of hydraulic riveting tools in the prior art for ultra-high pressure hydraulic riveting systems, and can also lay the foundation for the lightweight of existing hydraulic riveting tools.

[0020] The system of the present invention can be used not only for pull-off blind rivet type fasteners, but also for non-pull-off short-tail rivets, repeatable rivets and other product types to meet the needs of various products.

[0021] The system of the present invention can directly set and change the riveting pressure and riveting mode through the touch display screen, and display the current working pressure in real time, while realizing the single button control of the riveting tool hydraulic riveting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a hydraulic power system according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of a three-dimensional structure from another viewing angle of an embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the arrangement of the plunger hydraulic pump heads of three groups of pump heads according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the arrangement of the plunger hydraulic pump heads of six groups of pump heads according to an embodiment of the present invention.

[0027] The accompanying drawings are marked as follows: 1 is the main hydraulic oil tank, 2 is the liquid level gauge, 3 is the air filter, 4 is the motor, 4-1 is the motor one, 4-2 is the motor two, 5 is the hydraulic pump, 5-1 is the low-pressure large-flow pump, 5-2 is the high-pressure small-flow pump, 5-3 is the high-pressure small-flow pump, 6 is the unloading solenoid valve, 6-1 is the unloading solenoid valve one, 6-2 is the unloading solenoid valve two, 7 is the low-pressure pressure sensor, 7-1 is the low-pressure pressure sensor one, 7-2 is the low-pressure pressure sensor two, 8 is the high-pressure pressure sensor, 8-1 is the high-pressure pressure sensor one, 8-2 is the high-pressure pressure sensor two, 8-3 is the high-pressure pressure sensor three, 9 is the electromagnetic reversing valve, 10 is the pressure regulating valve, 11 is the pressurizing valve, 11-1 is the pressurizing valve one, 11-2 is the pressurizing valve two, 12 is Pressure relief valve, 12-1 is pressure relief valve one, 12-2 is pressure relief valve two, 13 is emergency unloading valve, 13-1 is emergency unloading valve one, 13-2 is emergency unloading valve two, 14 is radiator, 15 is safety valve, 16 is low-pressure safety valve, 16-1 is low-pressure safety valve one, 16-2 is low-pressure safety valve two, 17 is pump station support frame, 18 is pressure gauge, 19 is quick-change male connector, 20 is quick-change female connector, 21 is electrical control cabinet, 22 is filter, 22-1 is filter one, 22-2 is filter two, 23 is universal wheel, 24 is electrical signal connector, 25 is power switch, 26 is indicator light, 27 is plunger pump head, 28 is eccentric bearing, 29 is one-way valve, 29-1 is one-way valve one, 29-2 is one-way valve two. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0029] Combined with the attached pictures.

[0030] In the description of the hydraulic riveting system of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the patented product is usually placed when used. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0031] In the description of the hydraulic riveting system of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "install", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0032] The invention discloses a high-pressure oil supply system for hydraulic riveting, comprising an electric control system, a hydraulic power system and a moving device.

[0033] The electronic control system includes an electrical control cabinet composed of a touch screen, PLC, and relays. The electronic control system also includes a pressure sensor and a temperature control sensor; the hydraulic power system includes a motor, an oil tank, a pump body, a radiator, an oil channel, and a three-position four-way electromagnetic reversing valve assembly controlled by the electronic control system; the mobile device includes a wheeled trolley and a pump station support frame.

[0034] The hydraulic power system consists of two groups of hydraulic pumps driven by dual motors. Each group of hydraulic pumps contains three coaxial hydraulic pumps, among which hydraulic pump one is a low-pressure, high-flow pump, and hydraulic pump two and hydraulic pump three are high-pressure, low-flow pumps. During operation, one motor drives one group of hydraulic pumps, and the oil from the low-pressure, high-flow pump is supplied to two coaxially driven low-pressure, high-flow pumps, realizing two-stage pump station booster oil supply. A high-pressure, low-flow pump in one group is connected in parallel with the output end of a high-pressure, low-flow pump in another group to provide power hydraulic oil for the hydraulic control oil circuit, and another high-pressure, low-flow pump in one group is connected in parallel with the output end of another high-pressure, low-flow pump in another group to provide power hydraulic oil for the riveting tools.

[0035] The electronic control system can directly set and change the riveting pressure and riveting mode through the touch screen, and display the current working pressure in real time; at the same time, the temperature of the hydraulic oil in the tank is monitored in real time through the temperature control sensor. If the maximum temperature limit is exceeded, the machine will shut down to protect the equipment.

[0036] The electronic control system can control the synchronous start and operation of the two motors, and realize the switching of the hydraulic control oil circuit by controlling the three-position four-way electromagnetic reversing valve, thereby controlling the switching of the riveting oil circuit, and at the same time realize the single button control of the riveting tool to control the operation of the hydraulic riveting system.

[0037] The hydraulic power system is equipped with filters and radiators. The filters include built-in or external types, and the filtering accuracy includes coarse filters or fine filters, etc., to filter oil impurities and protect pump station equipment; radiators include air cooling, water cooling or oil cooling, etc., to reduce the oil temperature and ensure continuous operation of the equipment.

[0038] The motor used in the hydraulic power system is a servo motor, a stepper motor, or a special motor, etc.; the hydraulic pump used is a plunger hydraulic pump, a gear hydraulic pump, etc., and the plunger hydraulic pump heads are distributed in a single plane, or in parallel in multiple planes.

[0039] The overflow valve 1 of the hydraulic power system is a low-pressure oil circuit safety valve of the low-pressure, high-flow pump of the hydraulic pump 2, which is used to limit the maximum pressure of the low-pressure oil circuit. The low-pressure oil circuit is also provided with a unloading solenoid valve and a pressure sensor to realize pressure monitoring and safe pressure relief.

[0040] The overflow valve 2 of the hydraulic power system is a high-pressure, low-flow pump, high-pressure hydraulic control oil circuit safety valve of the hydraulic pump 2, which is used to limit the maximum pressure of the hydraulic control oil circuit to achieve safe pressure relief.

[0041] The overflow valve 3 of the hydraulic power system is a high-pressure, low-flow pump, high-pressure riveting oil circuit pressure regulating valve of the hydraulic pump 3, which is used to set the riveting pressure for the corresponding riveting purpose, realize the riveting pressure setting required for riveting for different purposes and safely relieve pressure in the event of overpressure. The high-pressure riveting oil circuit is also equipped with a pressure sensor, a pressure gauge and an emergency unloading valve to realize pressure monitoring and safe oil circuit pressure relief in emergency situations.

[0042] The hydraulic power system is equipped with a main oil tank, each pressure relief oil pipe is connected to the main oil tank return, and each hydraulic pump is fully immersed in the main oil tank. The hydraulic power system adopts a horizontal shaft output structure or a vertical shaft output structure.

[0043] The pressure relay of the electronic control system is used to send a signal to the pressure relief system to resume standby mode after detecting the reset of the pistons in the rod chamber and the rodless chamber of the riveting tool.

[0044] The input end of hydraulic pump 1 of the hydraulic power system is connected to the filter to absorb the oil from the main oil tank, and the output end oil circuit is directly connected to the input ends of hydraulic pump 2 and hydraulic pump 3, overflow valve 1 and unloading solenoid valve; the output end of hydraulic pump 2 is connected in parallel with the output end of hydraulic pump 2 of another group of hydraulic pumps, and then connected to overflow valve 2 and the inlet of the electromagnetic reversing valve, and then connected to the pressure valve and the hydraulically controlled non-return valve through the electromagnetic reversing valve; the output end of hydraulic pump 3 is connected to the front end of the non-return valve, and the other end of the non-return valve is connected in parallel with the non-return valve connected to the output end of hydraulic pump 3 of another group of hydraulic pumps, and then connected to overflow valve 3, pressure gauge and the inlet end of the pressure valve, and the other end of the pressure valve is connected to the hydraulically controlled non-return valve, riveting tool and emergency unloading valve.

[0045] The low-pressure oil circuit, high-pressure hydraulic control oil circuit and high-pressure riveting oil circuit of the hydraulic power system are all equipped with one or more pressure sensors for monitoring the real-time pressure of the oil circuit; the main oil tank or each high and low-pressure oil circuit is equipped with one or more temperature sensors for monitoring the real-time temperature of the oil.

[0046] The mobile device of this embodiment is a wheeled trolley, and the rollers are distributed in a four-point manner directly below the electric control system and the hydraulic power system; a partition is set on the top of the hydraulic riveted pump station support frame to place items and serve as a storage.

[0047] The high pressure oil supply system for hydraulic riveting of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments:

[0048] The high-pressure oil supply system for hydraulic riveting in this example includes an electronic control system, a hydraulic power system and a moving device.

[0049] like Figure 1 As shown in the figure, it is a schematic diagram of the hydraulic power system. As can be seen from the figure, the main hydraulic oil tank 1 is equipped with an air filter 3, which is connected to the atmosphere to ensure the stability of the internal pressure of the main hydraulic oil tank 1, and at the same time filter out atmospheric dust and impurities to avoid oil pollution; the main hydraulic oil tank 1 is also equipped with a liquid level gauge 2, which is convenient for users to check the oil level in the tank.

[0050] The hydraulic power system uses two groups of motors 4 to drive two groups of hydraulic pumps 5 respectively. Each group of hydraulic pumps 5 includes three coaxial hydraulic pumps, among which hydraulic pump 1 5-1 is a low-pressure and large-flow pump, and hydraulic pump 2 5-2 and hydraulic pump 3 5-3 are high-pressure and small-flow pumps. During operation, one motor 4 drives a group of hydraulic pumps 5, and the oil of hydraulic pump 1 is supplied to hydraulic pump 2 and hydraulic pump 3 driven by the same shaft, so as to realize the two-stage pump station boosting oil supply. Figure 1 As shown, hydraulic pump 2 and hydraulic pump 3 are respectively connected in parallel with the output ends of hydraulic pump 2 and hydraulic pump 3 of another group of hydraulic pumps 5, the oil of hydraulic pump 2 provides power for the hydraulic control oil circuit, and the oil of hydraulic pump 3 provides power for the riveting tool.

[0051] The input end of hydraulic pump 1 is connected to filter 22 to absorb oil from main hydraulic oil tank 1. The output end of the oil circuit is directly connected to hydraulic pump 2, input end of hydraulic pump 3, overflow valve 1 (low-pressure safety valve 16) and unloading solenoid valve 6, and a low-pressure pressure sensor 7 is provided in the oil circuit to monitor the real-time pressure of the oil circuit; the oil circuit of another group of hydraulic pumps 1 is connected in the same way, except that a radiator 14 is added to the return oil circuit to reduce the temperature of the hydraulic oil of the equipment. At the same time, the oil circuits of the two groups of hydraulic pumps 1 are not connected to each other to form a hydraulic oil circuit; the output end of hydraulic pump 2 is connected in parallel with the output end of hydraulic pump 2 of another group of hydraulic pumps It is then connected to the second overflow valve (safety valve 15) and the inlet of the electromagnetic reversing valve 9, and then connected to the pressure valve 11 and the hydraulically controlled one-way valve 12 through the electromagnetic reversing valve 9; the third output end of the hydraulic pump is connected to the front end of the one-way valve, and the other end of the one-way valve is connected in parallel with the one-way valve connected to the third output end of the hydraulic pump of another group of hydraulic pumps 5, and then connected to the overflow valve three (pressure regulating valve 10), the pressure gauge 18 and the inlet of the pressure valve 11, and the other end of the pressure valve 11 is connected to the hydraulically controlled one-way valve 12, the riveting tool and the emergency unloading valve 13. At the same time, the oil circuit is equipped with a high-pressure pressure sensor 8 to monitor the real-time pressure of the oil circuit.

[0052] Specifically, the working process of the hydraulic riveting system is as follows: after the riveting tool button is pressed and the electronic control system of the equipment receives the signal, the electromagnet V1 on the left side of the electromagnetic reversing valve 9 is energized and switched to the left position, and the dual motors 4 are controlled to start at the same time, driving the two groups of hydraulic pumps 5 to run at the same time, and hydraulic pump 1 absorbs the oil from the total hydraulic oil tank 1 and supplies it to hydraulic pump 2 and hydraulic pump 3. The excess oil flows back to the total hydraulic oil tank 1 through the overflow valve 1 (low-pressure safety valve 16); after the oil from hydraulic pump 2 merges with the oil from another group of hydraulic pump 2, it passes through the electromagnetic reversing valve 9 and enters the oil chamber of the left pressure valve 11, the left oil circuit is cut off, and the hydraulic control one-way valve 12 is opened at the same time. The oil in the oil chamber of the right-side pressure valve 11 returns to the oil tank, and the right-side oil circuit is connected, and the hydraulically controlled one-way valve 12 is closed; the excess oil in the oil circuit of the hydraulic pump 2 returns to the oil tank through the overflow valve 2 (safety valve 15) to keep the oil circuit pressure stable; the oil in the hydraulic pump 3 passes through the one-way valve and merges with the oil in another group of hydraulic pumps 3, and enters the right-side oil cylinder of the riveting tool through the right-side pressure valve 11. The riveting tool starts riveting, and the oil in the left-side oil cylinder of the riveting tool returns to the oil tank through the hydraulically controlled one-way valve 12; after riveting in place, release the riveting tool button, the right-side electromagnet V2 of the electromagnetic reversing valve 9 is energized and switched to the right position, and the oil in the hydraulic pump 2 passes through the electromagnetic reversing valve 9 and enters the oil chamber of the right-side pressure valve 11, and the right-side oil circuit is cut off, and the hydraulically controlled one-way valve 12 is closed. 12 is opened; the oil in the oil chamber of the left pressure valve 11 returns to the oil tank, the left oil circuit is connected, and the hydraulic control one-way valve 12 is closed at the same time; the oil in the hydraulic pump three enters the left cylinder of the riveting tool through the left pressure valve 11, the riveting tool is reset, and the oil in the right cylinder of the riveting tool returns to the oil tank through the hydraulic control one-way valve 2 12. When it is reset to the end of the stroke, the electronic control system detects through the high-pressure pressure sensor 8 that the oil pressure reaches the system set oil pressure, and the left electromagnet V1 and the right electromagnet V2 of the electromagnetic reversing valve 9 are both de-energized, and the oil in the hydraulic pump two passes through the electromagnetic reversing valve 9 and enters the oil chambers of the left and right pressure valves 11, the left and right side oil circuits are cut off, the hydraulic control one and two one-way valves 12 are opened, the hydraulic power system is unloaded, and runs at no load.

[0053] The left and right emergency unloading valves 13 can manually release the pressure of the A and B ports when the equipment electronic control system has no power supply, protecting the operator and the equipment. The relief valve 3 is a hydraulic power system riveting pressure regulating valve (pressure regulating valve 10), which mainly adjusts the riveting pressure of the rivet riveting tool, and can rivet broken rivets or short tail rivets.

[0054] like Figure 2 , Figure 3As shown, the mobile device is a wheeled trolley, which uses a universal wheel 23 as a roller. The rollers are distributed in a four-point manner directly below the electronic control system and the hydraulic power system. The hydraulic power system above the roller uses a motor 4 as a direct drive power source. The motor output shaft is connected to an eccentric rolling bearing 28. Multiple hydraulic pump heads drive the hydraulic pump 5 through the eccentric rolling of the bearing 28 to achieve the oil suction and discharge process. The entire hydraulic pump 5 is fully immersed in the main hydraulic oil tank 1. The upper part of the main hydraulic oil tank 1 carries a variety of hydraulic valve components and oil circuits, among which the hydraulic valve is integrated on the manifold, which has high integration, compact structure, low weight, and small size. Quick connectors are installed on the manifold to facilitate the plugging and unplugging of pipelines and the connection of riveting tools.

[0055] The hydraulic power system filter 22 is external and distributed on both sides of the main hydraulic oil tank 1. This arrangement is convenient for replacing and cleaning the filter element. The radiator 14 is external and arranged directly below the electrical control cabinet 21. Together with the large heat dissipation area of ​​the main hydraulic oil tank 1, it forms a heat dissipation system for the hydraulic riveting system to reduce the temperature of the hydraulic oil.

[0056] The hydraulic power system can adopt horizontal axis output mode or vertical axis output mode, which can supply large flow of oil to the riveting tool, provide a rated pressure of 150MPa, and realize fast riveting.

[0057] like Figure 4 , Figure 5 As shown, Figure 4 It is a schematic diagram of the arrangement of the plunger hydraulic pump head 27 of three groups of pump heads; Figure 5 The schematic diagram of the arrangement of the plunger hydraulic pump head 27 of the six pump heads is shown in FIG. Figure 5 The plunger hydraulic pump has six groups of pump heads, and each plunger hydraulic pump head 27 is distributed in a single plane, or in parallel in multiple planes, so as to realize rapid riveting of the riveting tool.

Claims

1. A high-pressure oil supply system for hydraulic riveting, which provides hydraulic oil power for hydraulic riveting tools to achieve riveting; it is characterized by: The high-pressure oil supply system includes an electronic control system and a hydraulic power system; the electronic control system and the hydraulic power system are arranged on a mobile device consisting of a wheeled trolley and a pump station support frame; The electric control system includes an electric control cabinet composed of a touch screen, a PLC, and a relay, and also includes a pressure sensor and a temperature control sensor arranged on each oil line, oil pipe, and oil tank; The hydraulic power system includes two motors and two groups of hydraulic pump groups; each group of hydraulic pump groups includes three coaxial hydraulic pumps, and the three coaxial hydraulic pumps are a low-pressure large-flow pump and two high-pressure small-flow pumps; one motor drives three coaxial hydraulic pumps in one group of hydraulic pump groups; the low-pressure large-flow pump of each group draws hydraulic oil from the oil tank and supplies it to the two high-pressure small-flow pumps in the same group, realizing two-stage pump station booster oil supply; a high-pressure small-flow pump of one group is connected in parallel with the output end of a high-pressure small-flow pump of another group to provide power hydraulic oil for the hydraulic control oil circuit, and another high-pressure small-flow pump of one group is connected in parallel with the output end of another high-pressure small-flow pump of another group to provide power hydraulic oil for the riveting tool.

2. The high pressure oil supply system for hydraulic riveting according to claim 1, characterized in that: The electronic control system is used to set or change the riveting pressure and riveting mode through the touch display screen, and display the current working pressure in real time; at the same time, the hydraulic oil temperature of the oil tank is monitored in real time through the temperature control sensor, and the equipment will be shut down to protect it if the maximum limit temperature is exceeded.

3. The high pressure oil supply system for hydraulic riveting according to claim 1, characterized in that: The electric control system controls the two motors to start and run synchronously, controls the switching of the hydraulic control oil circuit and the switching of the riveting oil circuit through the three-position four-way electromagnetic reversing valve, and realizes the single button control of the riveting tool to control the operation of the hydraulic riveting system.

4. The high pressure oil supply system for hydraulic riveting according to claim 1, characterized in that: The hydraulic power system is provided with a filter and a radiator; the filter includes an internal or external type, and the filtering accuracy includes a coarse filter or a fine filter, so as to filter oil impurities and protect the pump station equipment; the radiator includes air cooling, water cooling or oil cooling, so as to reduce the oil temperature and realize continuous operation of the equipment.

5. The high-pressure oil supply system for hydraulic riveting according to any one of claims 1 to 4, characterized in that: The motor used in the hydraulic power system is a servo motor, a stepper motor or a special motor; the hydraulic pump used is a plunger hydraulic pump or a gear hydraulic pump, and the plunger hydraulic pump heads are distributed on a single plane, or distributed in parallel on multiple planes; the hydraulic power system is provided with a main oil tank, and each pressure relief oil pipe is connected to the return flow of the main oil tank, and each hydraulic pump is fully immersed in the main oil tank.

6. The high pressure oil supply system for hydraulic riveting according to claim 5, characterized in that: The first overflow valve of the hydraulic power system is a low-pressure oil circuit safety valve for a low-pressure, large-flow pump, which is used to limit the maximum pressure of the low-pressure oil circuit. The low-pressure oil circuit is also provided with a unloading solenoid valve and a pressure sensor to realize pressure monitoring and safe pressure relief; the second overflow valve of the hydraulic power system is a high-pressure, small-flow pump, high-pressure hydraulic control oil circuit safety valve, which is used to limit the maximum pressure of the hydraulic control oil circuit to realize safe pressure relief; the third overflow valve of the hydraulic power system is another high-pressure, small-flow pump, high-pressure riveting oil circuit pressure regulating valve, which is used to set the corresponding riveting pressure. The high-pressure riveting oil circuit is also provided with a pressure sensor, a pressure gauge and an emergency unloading valve to realize pressure monitoring and safe pressure relief of the oil circuit in an emergency.

7. The high pressure oil supply system for hydraulic riveting according to claim 5, characterized in that: The hydraulic power system adopts a horizontal shaft output structure or a vertical shaft output structure.

8. The high pressure oil supply system for hydraulic riveting according to claim 5, characterized in that: The pressure relay of the electric control system is used to send a signal to the pressure relief system to resume standby after detecting that the pistons of the rod chamber and the rodless chamber of the riveting tool are reset.

9. The high pressure oil supply system for hydraulic riveting according to claim 5, characterized in that: The input end of the low-pressure, large-flow pump of the hydraulic power system is connected to a filter to absorb oil from the main oil tank, and the oil circuit of the output end is directly connected to the input ends of two coaxially driven high-pressure, small-flow pumps, a relief valve 1 and a unloading solenoid valve; the output end of one group of high-pressure, small-flow pumps is connected in parallel with the output end of another group of high-pressure, small-flow pumps, and then connected to the relief valve 2 and the inlet of the three-position, four-way solenoid reversing valve, and then connected to the pressurizing valve and the hydraulically controlled one-way valve through the three-position, four-way solenoid reversing valve; the output end of another group of high-pressure, small-flow pumps is connected to the front end of the one-way valve, and the other end of the one-way valve is connected in parallel with the one-way valve connected to the output end of another high-pressure, small-flow pump of another group, and then connected to the relief valve 3, the pressure gauge and the inlet end of the pressurizing valve, and the other end of the pressurizing valve is connected to the hydraulically controlled one-way valve, the riveting tool and the emergency unloading valve.

10. The high pressure oil supply system for hydraulic riveting according to claim 5, characterized in that: The low-pressure oil circuit, high-pressure hydraulic control oil circuit and high-pressure riveting oil circuit of the hydraulic power system are all provided with one or more pressure sensors for monitoring the real-time pressure of the oil circuit; the main oil tank or each high and low pressure oil circuit is provided with one or more temperature sensors for monitoring the real-time temperature of the oil.

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