CN218991852U - Hydraulic pump of continuous crimping hydraulic tool - Google Patents

Abstract

The utility model discloses a hydraulic pump of a continuous crimping hydraulic tool, which comprises a pump body and an oil bag, wherein a working piston cavity is arranged in the pump body, and an oil inlet passage and an oil return passage are arranged between the working piston cavity and the oil bag; an adjusting passage is further arranged in the pump body and comprises a main passage and a tee joint structure, a first passage of the tee joint structure is communicated with an outlet of the oil inlet passage, a second passage of the tee joint structure is communicated with an oil inlet section of the oil return passage, and a third passage of the tee joint structure is directly communicated with the oil bag; the main passage is provided with a regulating valve which closes the communication between the second passage and the third passage and enables the first passage to be communicated with the second passage when the pressure in the oil inlet passage exceeds a set value, and enables the second passage to be communicated with the third passage when the pressure in the oil inlet passage is lower than the set value. The design of the utility model realizes seamless rapid switching of pressurization and pressure release, fundamentally eliminates idle stroke time of the hydraulic pump, improves the use efficiency, and has the characteristics of simple and practical structure.

Description

Hydraulic pump of continuous crimping hydraulic tool

Technical Field

The utility model relates to a hydraulic tool for continuous crimping, in particular to a hydraulic pump of the hydraulic tool for continuous crimping.

Background

At present, the traditional hydraulic tool comprises a hydraulic oil pump, and in the pressure relief process of oil return, the oil return passage and the oil bag are always conducted, so that the hydraulic tool cannot be pressurized again, and the hydraulic tool can be pressurized again only after the pressure relief is completed and the oil return passage is closed.

Aiming at the problem, chinese patent CN 202021962233.7 discloses a hydraulic tool capable of being continuously crimped, wherein a backflow hole capable of being directly communicated with an oil bag is arranged on the side edge of the bottom of a pressure relief mounting hole, and a normally closed electromagnetic valve is arranged in the backflow hole. In the oil return process, once the clamp head assembly of the hydraulic tool resets and opens and can meet workpiece clamping, the linkage switch can be pressed, the electromagnetic valve is jumped to be opened and rapidly closed at the moment when the electromagnetic valve is jumped to be opened, the bottom of the pressure relief mounting hole is directly communicated with the oil pocket, and then the pressure in the balance cavity at the bottom of the pressure relief mounting hole is instantaneously disappeared, at the moment, the pressure relief valve piston and the thimble rapidly descend under the action of the restoring force of the compression spring, the centre of the thimble seals the pressure relief opening again to close the oil return passage, and meanwhile, the motor pressurizing device is started to compress low-pressure oil in the oil pocket and then send the low-pressure oil to the piston cavity for pressurizing operation again, so that continuous pressurizing operation of the hydraulic tool is realized, oil return idle time of the hydraulic tool is effectively shortened, and operating efficiency of the hydraulic tool is improved.

However, in the above structure of continuous press-connection, the arrangement of the electromagnetic valve increases the manufacturing cost to a certain extent, and the opening and closing of the electromagnetic valve requires the switch to trigger the control operation, which brings a certain inconvenience to the single-hand operation of the operator in actual use.

Disclosure of Invention

Aiming at the problems, the hydraulic pump of the continuous crimping hydraulic tool is designed, seamless and rapid switching of pressurization and pressure release of the hydraulic tool can be realized, so that the idle stroke time of the hydraulic pump is fundamentally eliminated, the service efficiency of the hydraulic tool is improved, and the hydraulic pump has the characteristics of simple and practical structure.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a hydraulic pump of hydraulic tool of crimping in succession, includes the pump body and oil bag, is provided with the work piston chamber in the pump body, is provided with oil feed passageway and oil return passageway between work piston chamber and the oil bag, is provided with motor pressurizing device in the oil feed passageway, is provided with the pressure release mounting hole in the play oil section of oil return passageway, is provided with safety relief valve in the pressure release mounting hole, its characterized in that: an adjusting passage is further arranged in the pump body and comprises a main passage and a tee joint structure, a first passage of the tee joint structure is communicated with an outlet of the oil inlet passage, a second passage of the tee joint structure is communicated with an oil inlet section of the oil return passage, and a third passage of the tee joint structure is directly communicated with the oil bag; the main passage is provided with a regulating valve which closes the communication between the second passage and the third passage and enables the first passage to be communicated with the second passage when the pressure in the oil inlet passage exceeds a set value, and enables the second passage to be communicated with the third passage when the pressure in the oil inlet passage is lower than the set value.

More specifically, the regulating valve comprises an outer valve body, an inner valve core and a return spring; a front convex ring and a rear convex ring are arranged on the outer wall of the outer valve body at intervals; the front convex ring is in sealing connection with the hole wall of the main passage of the adjusting passage through a sealing rubber ring; a middle connecting gap is formed between the front convex ring and the rear convex ring, and the middle connecting gap is communicated with the second passage; the front end of the rear convex ring is propped against the stop boss in the main passage, a rear connection gap is formed between the rear end of the rear convex ring and the outer wall of the rear end of the outer valve body, and the rear connection gap is communicated with the first passage; the inner part of the outer valve body is provided with a central hole which is of a multi-step hole structure and is sequentially divided into a front hole section, a middle hole section and a rear hole section from front to back; the outlet of the front hole section is directly communicated with the third passage, and a sealing convex ring is arranged at the connection part of the front hole section and the middle hole section; a plurality of oil guide outlet holes communicated with the middle connecting gap are radially distributed in the hole wall of the middle hole section along the circumferential direction, and a stop end surface is formed between the middle hole section and the rear hole section; the tail part of the rear hole section is provided with a plurality of oil guide holes communicated with the rear connecting gap at intervals along the circumferential direction; the middle hole section and the middle gap of the rear hole section are matched and provided with the inner valve core, the middle part of the inner valve core is provided with a convex spring seat, the reset spring is arranged between the spring seat and the stop end face, and the reset spring has precompression quantity to separate the head part of the valve core from the sealing convex ring to be in a normally open state; when the oil pressure in the oil inlet passage exceeds the restoring force of the restoring spring, the oil pressure acts on the rear end surface of the spring seat to push the inner valve core to move forward so that the top end of the inner valve core seals the inner hole of the sealing convex ring.

More specifically, the main passage is provided with a mounting hole for mounting operation of the regulating valve at the working piston chamber side, and the mounting hole is blocked by a plug.

More specifically, a pressure sensor is arranged in the working piston cavity, the pressure signal detected by the pressure sensor is transmitted to a controller of the hydraulic tool in real time, the controller compares the received pressure signal with an internal stored limit pressure value, and when the received pressure signal exceeds the limit pressure value, a signal is sent to stop the motor pressurizing device.

According to the utility model, the regulating passage and the regulating valve are arranged between the oil inlet passage and the oil return passage in the pump body, and the quick switching of the pressurization and the pressure release of the hydraulic pump can be realized through the cooperation action of the regulating passage and the regulating valve. When the motor pressurizing device works in the oil inlet passage to generate high-pressure oil, the high-pressure oil can push the inner valve core of the regulating valve to move forwards to close the conduction between the main passage and the third passage, and at the moment, the high-pressure oil enters the working piston cavity through the first passage, the oil inlet hole, the gap between the central hole of the outer valve body and the inner valve core, the oil outlet hole, the second passage and the oil inlet section of the oil return passage to perform normal pressurizing operation; once the motor pressurizing device stops working, the pressure in the oil inlet passage disappears, at the moment, the inner valve core moves backwards under the action of the reset force of the reset spring, so that the head of the inner valve core is separated from the sealing convex ring, the main passage is communicated with the third passage, and at the moment, high-pressure oil in the working piston cavity returns to the oil bag through the oil inlet section of the oil return passage, the second passage, the oil guide outlet, the inner hole of the sealing convex ring and the third passage, and rapid pressure relief operation is performed. Similarly, the motor is started to perform pressurization operation, the motor is closed to perform pressure relief operation, and seamless rapid switching of hydraulic pump pressurization and pressure relief can be realized only by starting and stopping the motor, so that the hydraulic pump is particularly suitable for single-hand operation of operators, the oil return idle time of a hydraulic tool can be fundamentally eliminated, and the working efficiency of the hydraulic tool is improved.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

fig. 2 is a schematic perspective view of a pump body according to the present utility model:

FIG. 3, a top view of the present utility model;

FIG. 4 is a schematic cross-sectional view of section A-A of FIG. 3 in accordance with the present utility model;

FIG. 5, a front view of the present utility model;

FIG. 6 is a schematic cross-sectional view of section B-B of FIG. 5 in accordance with the present utility model;

FIG. 7 is a schematic cross-sectional view of section C-C of FIG. 5 in accordance with the present utility model;

FIG. 8 is a schematic perspective view of a regulating valve according to the present utility model;

fig. 9, a cross-sectional view of a regulator valve of the present utility model.

Detailed Description

Technical aspects of embodiments of the present utility model will be clearly and fully described in the following description of the embodiments of the present utility model with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some, but not all embodiments of the present utility model.

In the description of the present utility model, it should be noted that, the terms "upper", "lower", "left", "right", "inner", "outer", "both ends", and the like are merely for convenience of description and simplification of the description based on the orientation or the positional relationship shown in the drawings, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

As shown in fig. 1 to 9, a hydraulic pump of a continuous crimping hydraulic tool includes a pump body 1 and an oil bag 2.

The hydraulic pump is characterized in that a working piston cavity 11 is arranged in the pump body 1, an oil inlet passage 12 and an oil return passage 13 are arranged between the working piston cavity 11 and the oil bag 2, a motor pressurizing device 3 is arranged in the oil inlet passage 12, a pressure relief mounting hole 131 is arranged in an oil outlet section 13a of the oil return passage 13, a safety pressure relief valve 4 is arranged in the pressure relief mounting hole 131, and the pressure relief valve 4 is opened for pressure relief operation only when the oil pressure value in the working piston cavity 11 exceeds a limit so as to avoid damage to the hydraulic pump due to overlarge working pressure.

An adjusting passage is further arranged in the pump body 1, the adjusting passage comprises a main passage 141 and a three-way structure, the three-way structure is a first passage 142, a second passage 143 and a third passage 144, the first passage 142 is communicated with the outlet of the oil inlet passage 12, the second passage 143 is communicated with the oil inlet section 13b of the oil return passage 13, and the third passage 144 is directly communicated with the oil bag 2.

The main passage 141 of the regulating passage is provided with a regulating valve 5, and when the pressure in the oil inlet passage 12 exceeds a set value, the regulating valve 5 closes the communication between the main passage 141 and the third passage 144 and conducts the first passage 142 and the second passage 143, so that the oil inlet passage 12 is communicated with the inlet section 13b of the oil return passage 13, and normal pressurization operation is performed. When the pressure in the oil inlet passage 12 is lower than a set value, the regulating valve 5 enables the second passage 143 and the third passage 144 to be communicated, so that the inlet section 13b of the oil return passage 13 is directly communicated with the oil pocket 2, and the quick pressure relief operation is performed.

The regulator valve 5 includes an outer valve body 51, an inner valve core 52, and a return spring 53.

The outer wall of the outer valve body 51 is provided with a front convex ring 511 and a rear convex ring 512 at intervals. Wherein the front convex ring 511 is in sealing connection with the hole wall of the main passage 141 through a sealing rubber ring 6. A middle connection gap 513 is formed between the front convex ring 511 and the rear convex ring 512, and the middle connection gap 513 is directly communicated with the oil return passage 13 via the second passage 143. The front end of the rear convex ring 512 abuts against the stop boss 1411 in the main passage 141, a rear connection gap 514 is formed between the rear end of the rear convex ring 512 and the rear outer wall of the outer valve body 51, and the rear connection gap 514 communicates with the oil inlet passage 12 via the first passage 142.

The outer valve body 51 is internally provided with a central hole 515, and the central hole 515 is a multi-step hole structure, which is sequentially divided into a front hole section 5151, a middle hole section 5152 and a rear hole section 5153 from front to rear. The outlet of the front hole section 5151 is communicated with the oil bag 2 through a third passage 144; the front hole section 5151 and the middle hole section 5152 are provided with sealing convex rings 5154 at the connection parts. The hole wall of the middle hole section 5152 is radially provided with a plurality of oil guiding holes 5155 communicated with the middle connecting gap 513, which are four in the figure, and one, two, three or more oil guiding holes can be arranged in practice according to the requirement; a stop end face 5156 is formed between the intermediate 5152 and rear 5153 bore sections. The rear hole 5153 has a plurality of oil inlets 5157 at intervals along the circumferential direction, which are in communication with the rear connection gap 514, and two oil inlets 5157 are provided in the present embodiment, and may be one, three or more in practice.

The inner valve core 52 is disposed in the middle hole section 5152 and the rear hole section 5153 in a clearance fit manner, a convex spring seat 521 is disposed in the middle of the inner valve core 52, the return spring 53 is disposed between the spring seat 521 and the stop end face 5156, and the return spring 53 has a precompression amount to separate the head of the inner valve core 52 from the sealing convex ring 5154 to be in a normally open state. When the oil pressure in the oil return passage 12 is sufficiently large, the oil pressure acts on the rear end surface of the spring seat 521 to push the inner spool 52 forward so that the top end thereof closes the inner hole of the seal boss 5154.

Here, in consideration of the actual installation requirement of the regulator valve 5, the main passage 141 is provided with an installation hole 5a for the installation operation of the regulator valve 5 on the working piston chamber side, and the installation hole 5a is blocked by the plug 5a1 after the regulator valve 5 is completely installed.

In summary, the pump body 1 of the present utility model is provided with the oil inlet passage 12, the oil return passage 13, the adjusting passage and the adjusting valve 5, and the rapid switching between the pressurization and the pressure release of the hydraulic pump is realized by the cooperation of the two. In the initial state, the motor pressurizing device 3 does not work, at the moment, no pressure exists in the oil inlet passage 12, meanwhile, due to the existence of the restoring force of the restoring spring 53, the head of the inner valve core 52 and the sealing convex ring 5154 are always in a separated state, at the moment, the main passage 141 and the third passage 144 are communicated, and the oil inlet section 13b of the oil return passage 13 is communicated with the oil bag 2 through the second passage 143, the main passage 141, the third passage 144 and the oil bag 2. When the motor pressurizing device 3 works, once high-pressure oil is generated in the oil inlet passage 12 and acts on the rear end face of the valve core spring seat 521 in the regulating valve to push the inner valve core 52 to overcome the restoring force of the restoring spring 53 and move forwards further, the process is carried out until the top end of the inner valve core 52 seals the inner hole of the sealing convex ring 5154, at the moment, the conduction between the main passage 141 and the third passage 144 is closed, at the moment, the high-pressure oil in the oil inlet passage 12 enters the working piston cavity 11 through the first passage 142, the rear connecting gap 514, the oil inlet hole 5157, the gap between the central hole 515 of the outer valve body and the inner valve core 52, the oil outlet hole 5155, the middle connecting gap 513, the second passage 143 and the oil inlet section 13b of the oil return passage 13, so that normal pressurizing operation is realized. And once the motor pressurizing device 3 stops working, the pressure in the oil inlet passage 12 disappears, at this time, the inner valve core 52 moves backwards again under the action of the restoring force of the restoring spring 53, so that the head of the inner valve core 52 is separated from the sealing convex ring 5154, at this time, the high-pressure oil in the working piston cavity 11 returns to the oil pocket 2 through the oil inlet section 13b of the oil return passage 13, the second passage 143, the middle connecting gap 513, the oil outlet 5155, the inner hole of the sealing convex ring 5154, the third passage 144, and the rapid pressure relief operation is performed. And similarly, the motor is started to pressurize and closed to release pressure, so that seamless rapid switching between pressurizing and releasing of the hydraulic pump is realized, the hydraulic pump is particularly suitable for single-hand operation of operators, the oil return idle time of the hydraulic tool can be fundamentally eliminated, and the working efficiency of the hydraulic tool is improved.

In order to solve the problem that the safety relief valve 4 in practice may fail to open in time due to occasional mechanical failure, the utility model provides a pressure sensor 6 in the working piston chamber 11, the pressure sensor 6 transmits the pressure signal detected by the pressure sensor to the controller of the hydraulic tool in real time, the controller compares the received pressure signal with the limit pressure value stored in the interior, and sends a signal to stop the motor pressurizing device 3 when the received pressure signal exceeds the limit pressure value, and once the motor stops working, the quick relief operation can be performed through the third passage 144, thereby realizing double relief protection of the hydraulic pump and avoiding pressure overload phenomenon in operation.

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation or variation of the above embodiments according to the technical principles of the present utility model still fall within the scope of the technical solutions of the present utility model.

Claims (4)

1. The utility model provides a hydraulic pump of hydraulic tool of crimping in succession, includes the pump body and oil bag, is provided with the work piston chamber in the pump body, is provided with oil feed passageway and oil return passageway between work piston chamber and the oil bag, is provided with motor pressurizing device in the oil feed passageway, is provided with the pressure release mounting hole in the play oil section of oil return passageway, is provided with safety relief valve in the pressure release mounting hole, its characterized in that: an adjusting passage is further arranged in the pump body and comprises a main passage and a tee joint structure, a first passage of the tee joint structure is communicated with an outlet of the oil inlet passage, a second passage of the tee joint structure is communicated with an oil inlet section of the oil return passage, and a third passage of the tee joint structure is directly communicated with the oil bag; the main passage is provided with a regulating valve which closes the communication between the second passage and the third passage and enables the first passage to be communicated with the second passage when the pressure in the oil inlet passage exceeds a set value, and enables the second passage to be communicated with the third passage when the pressure in the oil inlet passage is lower than the set value.

2. A hydraulic pump for a continuous crimping hydraulic tool as in claim 1 wherein: the regulating valve comprises an outer valve body, an inner valve core and a return spring; a front convex ring and a rear convex ring are arranged on the outer wall of the outer valve body at intervals; the front convex ring is in sealing connection with the hole wall of the main passage of the adjusting passage through a sealing rubber ring; a middle connecting gap is formed between the front convex ring and the rear convex ring, and the middle connecting gap is communicated with the second passage; the front end of the rear convex ring is propped against the stop boss in the main passage, a rear connection gap is formed between the rear end of the rear convex ring and the outer wall of the rear end of the outer valve body, and the rear connection gap is communicated with the first passage; the inner part of the outer valve body is provided with a central hole which is of a multi-step hole structure and is sequentially divided into a front hole section, a middle hole section and a rear hole section from front to back; the outlet of the front hole section is directly communicated with the third passage, and a sealing convex ring is arranged at the connection part of the front hole section and the middle hole section; a plurality of oil guide outlet holes communicated with the middle connecting gap are radially distributed in the hole wall of the middle hole section along the circumferential direction, and a stop end surface is formed between the middle hole section and the rear hole section; the tail part of the rear hole section is provided with a plurality of oil guide holes communicated with the rear connecting gap at intervals along the circumferential direction; the middle hole section and the middle gap of the rear hole section are matched and provided with the inner valve core, the middle part of the inner valve core is provided with a convex spring seat, the reset spring is arranged between the spring seat and the stop end face, and the reset spring has precompression quantity to separate the head part of the valve core from the sealing convex ring to be in a normally open state; when the oil pressure in the oil inlet passage exceeds the restoring force of the restoring spring, the oil pressure acts on the rear end surface of the spring seat to push the inner valve core to move forward so that the top end of the inner valve core seals the inner hole of the sealing convex ring.

3. A hydraulic pump for a continuous crimping hydraulic tool as claimed in claim 1 or 2, wherein: the main passage is provided with a mounting hole for mounting operation of the regulating valve at the cavity side of the working piston, and the mounting hole is blocked by a plug.

4. A hydraulic pump for a continuous crimping hydraulic tool as claimed in claim 1 or 2, wherein: the working piston cavity is internally provided with a pressure sensor, the pressure sensor transmits pressure signals detected by the pressure sensor to a controller of the hydraulic tool in real time, the controller compares the received pressure signals with the internal stored limit pressure values, and when the received pressure signals exceed the limit pressure values, signals are sent out to stop the motor pressurizing device.

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