CN210686482U - Load memory valve - Google Patents
Load memory valve Download PDFInfo
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- CN210686482U CN210686482U CN201921460319.7U CN201921460319U CN210686482U CN 210686482 U CN210686482 U CN 210686482U CN 201921460319 U CN201921460319 U CN 201921460319U CN 210686482 U CN210686482 U CN 210686482U
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Abstract
The utility model relates to a load memory valve, which comprises an end cover, a valve seat, a control piston, a valve core reset spring, a control piston reset spring, a valve body, a pressure memory valve core, a pressure comparison valve core, a pressure regulating spring, a micro-gap switch push rod, a pressing block push rod, a micro-gap switch guide block, a micro-gap switch, a pressing block, a micro-gap switch contact, an oil inlet and a control oil port; the pressure oil introduced through the oil inlet acts on the lower ends of the pressure memory valve core and the pressure comparison valve core simultaneously, and the pressure oil and the pressure comparison valve core are balanced with the spring force of the pressure regulating spring respectively. The problem of secondary lifting and gliding can be effectively solved by adopting the load memory valve, pressure generated by the load during lifting is determined by the position of the pressure memory valve core, when the secondary lifting is carried out, only when the pressure during lifting pushes the pressure comparison valve core to the corresponding position, the microswitch can send a signal, and the brake can be opened.
Description
Technical Field
The utility model relates to a load memory valve is applied to the open hydraulic pressure of hydraulic motor driven lifting device and is risen to rise in the return circuit, can prevent to rise the device and rise the in-process at the load and stop when rising once more after a period, the gliding phenomenon out of control in the twinkling of an eye that probably takes place. And more particularly to a load memory valve for use in a hydraulic control system for preventing a secondary lifting slip of a hydraulic motor driven lifting device by controlling the operation of a brake.
Background
A hydraulic motor driven hoist is a mechanical device for transferring an object from one location to another, during which transfer the object must be lifted. In the lifting operation process, the most frequently occurring problem is the problem of 'secondary lifting gliding'. The 'secondary lifting gliding down' means that when the heavy object stays for a period of time and then is lifted again for the second time (or the third time and the like) in the lifting process, the heavy object often glides for a certain distance firstly due to the self weight to be lifted normally. This phenomenon may cause a serious safety accident when it is serious.
With the increasing use of lifting devices, such as cranes, hoisting winches, etc., and the increasing hoisting weight, the safety performance of the lifting devices is also gaining more and more attention. Accordingly, the safety of the hoisting device is seriously affected by the problem of 'secondary hoisting gliding' of the hoisting device, so that the hoisting device is increasingly concerned by people. In order to solve the problem of 'secondary lifting gliding' of a lifting device, the prior art mainly adopts the following three technical schemes:
firstly, a brake delay oil-through mode is adopted, namely, when the brake is lifted, the brake is opened after a certain time delay; in the mode, when the load is large, the tendency of secondary gliding exists; when the load is small, the brake is opened only when the lifting pressure is high, and the phenomenon of forward rush of a lifting system, namely instantaneous sudden acceleration, can be caused.
Secondly, a pressure memory system composed of an energy accumulator and a one-way valve is adopted, for example, the Chinese utility model patent CN2040896U, the gravity of the lifted load is memorized, when the secondary lifting operation is carried out, the brake state of a brake is released only when the lifting driving force reaches or is more than the previous load gravity, thereby realizing the function of preventing the secondary lifting from sliding downwards; the drawbacks of this solution are: because the energy accumulator is added, more flow is needed when the lifting device is lifted for the first time, and the load weight can be lifted only when the pressure of the energy accumulator is charged to reach the pressure for lifting the load; in reverse operation, the accumulator must be released from pressure before movement can occur.
Thirdly, a secondary lifting and gliding prevention system comprising a load gravity sensor, a driving variable sensor, an electronic control unit and a brake driving device is adopted; for example, the utility model WO2011120393a1, wherein the load gravity sensor detects load gravity of the crane and transmits a load gravity signal to the electronic control unit, the drive variable sensor detects a drive variable signal related to a lifting driving force of the crane and transmits the drive variable signal to the electronic control unit, the electronic control unit calculates a value of the lifting driving force according to the drive variable signal and compares the value of the lifting driving force with the load gravity signal, and when the load gravity is equal to the lifting driving force, the electronic control unit controls the brake driving device to release the brake of the crane; the scheme can accurately control and solve the problem of 'secondary lifting and gliding'; however, because of the addition of more "delicate" sensors, electronic control units, etc., the ability to adapt to harsh environments is inevitably reduced, and the reliability is reduced due to the complexity of the system.
Therefore, a device and a method capable of effectively solving the problem of secondary lifting and gliding of a lifting device are needed, and the device not only has universal applicability, but also is simple and practical.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defect of the secondary lifting and gliding problem of the lifting device in the prior art and providing a load memory valve.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a load memory valve comprises an end cover, a valve seat, a control piston, a valve core reset spring, a control piston reset spring, a valve body, a pressure memory valve core, a pressure comparison valve core, a pressure regulating spring, a microswitch push rod, a pressing block push rod, a microswitch guide block, a microswitch, a pressing block, a microswitch contact, an oil inlet and a control oil port;
the pressure oil introduced through the oil inlet acts on the lower ends of the pressure memory valve core and the pressure comparison valve core simultaneously, and the pressure oil and the pressure comparison valve core are balanced with the spring force of the pressure regulating spring respectively;
the upper parts of the pressure memory valve core and the pressure comparison valve core are correspondingly connected with a microswitch push rod and a pressing block push rod, the upper part of the microswitch push rod is connected with a microswitch guide block, and the upper part of the pressing block push rod is connected with a pressing block;
pressure oil is introduced through the control oil port, the piston return spring is controlled and the control piston is pushed, the pressure oil at the lower end of the valve core opening control pressure memory valve core is decompressed through the oil inlet, and the microswitch push rod pushes the microswitch to do descending motion.
Preferably, the bottom of the valve seat is provided with an end cover, the upper part of the valve seat is provided with a valve body and a control piston, and the valve core is arranged in an inner cavity of the control piston.
Preferably, the valve core is of a cone valve structure, and a valve core return spring is arranged on the valve core.
Preferably, the lower action areas of the pressure memory valve core and the pressure comparison valve core are equal.
Preferably, the number of the pressure regulating springs is two, and the parameters are the same.
Preferably, the microswitch push rod and the pressing block push rod are parallel to each other and in the same plane.
Preferably, one end of the microswitch is provided with a microswitch contact, and the microswitch contact is in contact with the pressing block.
The utility model has the advantages that:
1. the utility model discloses, through having offered oil inlet and control hydraulic fluid port on the valve body of load memory valve, when the oil inlet lets in pressure oil, pressure oil acts on the lower extreme of pressure memory case, promotes to act on the lower extreme of pressure comparison case, and respectively with the spring force balance of pressure regulating spring, promote micro-gap switch push rod and briquetting push rod to move up to the same position simultaneously; when the valve core stays in the lifting process, the valve core is closed under the action of the valve core return spring, pressure oil at the lower end of the pressure memory valve core is sealed, and the microswitch push rod is kept in the original position to play a role in memorizing the load; when the pressure oil is required to rise for the second time, the pressing block push rod is pushed to move upwards continuously along with the rise of the pressure oil until the pressing block presses the contact of the microswitch, and the microswitch sends out a signal to inform the brake to be opened.
2. The utility model discloses a load memory valve can effectively solve the secondary and play to rise the gliding problem, and the pressure that the load produced when rising is confirmed by the position of pressure memory case, and when the secondary rises, only plays to rise pressure and pushes away the pressure comparison case to corresponding the position, and micro-gap switch just can the signals, and the stopper just can be opened, and this load memory valve simple structure, and the realization is easy, and the reliability is high.
Drawings
Fig. 1 is a schematic normal state diagram of a load memory valve according to the present invention;
fig. 2 is a schematic diagram of a state of the load memory valve before the second lifting;
fig. 3 is a schematic diagram of a state of the load memory valve during normal lifting operation or when the brake is opened during secondary lifting operation;
fig. 4 is a schematic view illustrating an application of the load memory valve in a motor lifting loop according to the present invention.
In the figure: the hydraulic control valve comprises an end cover 1, a valve seat 2, a control piston 3, a valve core 4, a valve core reset spring 5, a control piston reset spring 6, a valve body 7, a pressure memory valve core 8, a pressure comparison valve core 9, a pressure regulating spring 10, a microswitch push rod 11, a briquetting push rod 12, a microswitch guide block 13, a microswitch 14, a briquetting 15, a microswitch contact 16, a hydraulic pump 17, an overflow valve 18, a three-position four-way reversing valve 19, a balance valve 20, a hydraulic motor 21, a brake cylinder 22, a two-position three-way reversing valve 23, an oil inlet A and a control oil port K.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Example (b): when pressure oil is introduced into an oil inlet A in the load memory valve, the pressure oil overcomes the spring force of a valve core reset spring 5, a valve core 4 (the valve core 4 is of a cone valve structure) is opened and acts on the lower end of a pressure memory valve core 8, the pressure oil simultaneously acts on the lower end of a pressure comparison valve core 9 (the acting areas of the lower parts of the pressure memory valve core 8 and the pressure comparison valve core 9 are equal), the pressure oil is balanced with the spring force of two pressure regulating springs 10 (the pressure regulating springs 10 are the same in parameter), a microswitch push rod 11 is pushed to drive a microswitch 14 to move upwards to a certain position along a microswitch guide block 13, a briquetting push rod 12 simultaneously moves upwards to the same position, and a briquetting 15 is always pressed on a microswitch contact 16 in the process (as shown in figure;
when the valve core 4 stays in the lifting process, the valve core is closed under the action of the valve core return spring 5, pressure oil at the lower end of the pressure memory valve core 8 is sealed, the microswitch push rod 11 is kept in the original position, and the pressing block push rod 12 is retreated to the lowest position under the action of the pressure regulating spring 10 (as shown in the attached figure 2);
when the secondary lifting is needed, the pressing block push rod 12 is pushed to move upwards continuously along with the rising of the pressure oil until the pressing block 15 presses the micro switch contact 16 (shown in figure 3), and the micro switch 14 sends a signal to inform the brake to be opened; when the pressure-relief valve needs to descend, low-pressure oil or a direct oil return tank is led to the oil inlet A at the moment, pressure oil is led to the control oil port K, the spring force of the control piston return spring 6 is overcome, the control piston 3 is pushed to move upwards, the valve core 4 is opened, the pressure oil at the lower end of the pressure memory valve core 8 is relieved through the oil inlet A, and the micro switch push rod 11 drives the micro switch 14 to descend to the original position.
In particular, with reference to fig. 4, there is shown a use of the load memory valve in a hydraulic motor driven lifting device:
when the brake cylinder is normally lifted, the three-position four-way reversing valve 19 is in the left position, the two-position three-way reversing valve 23 is in the right position, and the lower cavity of the brake cylinder 22 is filled with oil and is in an open state; the pressure oil at the outlet of the hydraulic pump 17 enters the lower cavity of the hydraulic motor 21 through the left position of the three-position four-way reversing valve 19 and the check valve of the balance valve 20 and the hydraulic control check valve; pressure oil at the outlet of the hydraulic pump 17 simultaneously enters an oil inlet A of the load memory valve through the left position of the three-position four-way reversing valve 19, the micro-switch push rod 11 and the pressing block push rod 12 are pushed to simultaneously move upwards to the same position, and the pressing block 15 is always pressed on the micro-switch contact 16 in the process (as shown in the attached figure 3);
during midway stay, the pressure-regulating valve is positioned at a middle position through the three-position four-way reversing valve 19, the two-position three-way reversing valve 23 is positioned at a left position, a lower cavity of the brake cylinder 22 is communicated with an oil tank through the left position of the two-position three-way reversing valve 23, the brake cylinder 22 is in a braking state, the valve core 4 is closed under the action of the valve core return spring 5, pressure oil at the lower end of the pressure memory valve core 8 is sealed, the microswitch push rod 11 is kept at the original position, and the briquetting push rod 12 retreats to the lowest position under the action of the;
when the hydraulic motor is lifted for the second time, the three-position four-way reversing valve 19 is in the left position, the pressing block push rod 12 is pushed to move upwards continuously along with the rising of the pressure oil until the pressing block 15 presses the micro switch contact 16 (shown in the attached drawing 3), the micro switch 14 sends out a signal to inform the electromagnet of the two-position three-way reversing valve 23 of being electrified, the two-position three-way reversing valve 23 is in the right position, the pressure oil carries the lower cavity of the moving cylinder 22, the brake is opened, and the hydraulic motor 21 is started;
when the brake cylinder needs to descend, the three-position four-way reversing valve 19 is located at the right position, the two-position three-way reversing valve 23 is located at the right position, and the brake cylinder 22 is in an open state; pressure oil at the outlet of the hydraulic pump 17 enters the upper cavity of the hydraulic motor 21 through the right position of the three-position four-way reversing valve 19, meanwhile, the pressure oil overcomes the spring force of the control piston return spring 6 through the control oil port K of the load memory valve, the control piston 3 is pushed to move upwards, the valve core 4 is opened, the pressure oil at the lower end of the pressure memory valve core 8 is decompressed through the oil inlet A, and the micro switch push rod 11 drives the micro switch 14 to descend to the original position to prepare for next lifting; the oil in the lower cavity of the hydraulic motor 21 passes through the hydraulic control one-way valve and the throttle valve of the balance valve 20 and then passes through the right oil return tank of the three-position four-way reversing valve 19.
It should be noted that the secondary lifting and gliding prevention system shown in fig. 4 is a preferred embodiment of the present invention, but the present invention is not limited to the preferred embodiment shown in the drawings.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (7)
1. A load memory valve comprises an end cover (1), a valve seat (2), a control piston (3), a valve core (4), a valve core reset spring (5), a control piston reset spring (6), a valve body (7), a pressure memory valve core (8), a pressure comparison valve core (9), a pressure regulating spring (10), a micro switch push rod (11), a pressing block push rod (12), a micro switch guide block (13), a micro switch (14), a pressing block (15), a micro switch contact (16), an oil inlet (A) and a control oil port (K), and is characterized in that;
pressure oil introduced through the oil inlet (A) acts on the lower ends of the pressure memory valve core (8) and the pressure comparison valve core (9) at the same time, and the pressure memory valve core (8) and the pressure comparison valve core (9) are balanced with the spring force of the pressure regulating spring (10) respectively;
the upper parts of the pressure memory valve core (8) and the pressure comparison valve core (9) are correspondingly connected with a micro switch push rod (11) and a pressing block push rod (12), the upper part of the micro switch push rod (11) is connected with a micro switch guide block (13), and the upper part of the pressing block push rod (12) is connected with a pressing block (15);
pressure oil is introduced through the control oil port (K), the piston return spring (6) is controlled and the control piston (3) is pushed, the valve core (4) opens the pressure oil at the lower end of the control pressure memory valve core (8) to be decompressed through the oil inlet (A), and the microswitch push rod (11) pushes the microswitch (14) to do descending motion.
2. A load memory valve according to claim 1, characterized in that the bottom of the valve seat (2) is provided with the end cover (1), the upper part of the valve seat (2) is provided with the valve body (7) and the control piston (3), and the valve core (4) is arranged in the inner cavity of the control piston (3).
3. A load memory valve according to claim 2, characterized in that the valve core (4) is of a cone valve structure, and a valve core return spring (5) is arranged on the valve core (4).
4. A load memory valve according to claim 1, characterized in that the lower active areas of the pressure memory spool (8) and the pressure comparison spool (9) are equal.
5. A load memory valve according to claim 1, characterized in that said pressure regulating springs (10) are two in number and have the same parameters.
6. A load memory valve according to claim 1, characterized in that said microswitch push rod (11) and said pressure block push rod (12) are parallel to each other and in the same plane.
7. A load memory valve according to claim 1, characterized in that one end of the microswitch (14) is provided with a microswitch contact (16) and the microswitch contact (16) is in contact with the pressure piece (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921460319.7U CN210686482U (en) | 2019-09-04 | 2019-09-04 | Load memory valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921460319.7U CN210686482U (en) | 2019-09-04 | 2019-09-04 | Load memory valve |
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| Publication Number | Publication Date |
|---|---|
| CN210686482U true CN210686482U (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921460319.7U Active CN210686482U (en) | 2019-09-04 | 2019-09-04 | Load memory valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110513345A (en) * | 2019-09-04 | 2019-11-29 | 太原理工大学 | A kind of load memory valve |
| CN112901579A (en) * | 2021-01-12 | 2021-06-04 | 三一重机有限公司 | Valve core working position memory device |
-
2019
- 2019-09-04 CN CN201921460319.7U patent/CN210686482U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110513345A (en) * | 2019-09-04 | 2019-11-29 | 太原理工大学 | A kind of load memory valve |
| CN110513345B (en) * | 2019-09-04 | 2024-05-17 | 太原理工大学 | Load memory valve |
| CN112901579A (en) * | 2021-01-12 | 2021-06-04 | 三一重机有限公司 | Valve core working position memory device |
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