Valve rod driving device and load sensitive valve

Abstract

The utility model relates to the technical field of load-sensitive valves, in particular to a valve rod driving device and a load-sensitive valve. Comprising a machine shell, a through hole allowing a valve rod to penetrate through is formed in the machine shell, a motor is fixedly installed in the machine shell, an output shaft of the motor is in transmission connection with a connecting block through a transmission mechanism, and the connecting block is connected with the valve rod and can drive the valve rod to move axially. By means of the structure, the motor is used for directly driving the connecting block, then the valve rod is driven to move transversely, the moving position and distance of the valve rod can be directly controlled through the motor, the flowing pressure adjusting process of pressure oil is not needed, the valve rod is switched more timely, and the response speed is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to load sensitive valve technical field, concretely relates to a valve rod drive arrangement and load sensitive valve. BACKGROUND

[0002] In the load sensitive valve, the valve rod is mainly used for controlling the on-off between each oil passage in the valve body, and then controlling the corresponding action of the actuator. At present, the movement of the valve rod is mainly controlled by the electromagnetic valve, two electromagnetic valve control mechanisms are arranged at the two ends of the valve rod, when it is needed to move, the pressure difference at the two ends of the valve rod is controlled through the on-off of the electromagnetic valve, and then the valve rod is controlled to move. Although the movement of the valve rod can be controlled by the electromagnetic valve to realize the automatic control of the fluid, the control precision and response speed of the valve rod are slightly insufficient because the movement of the valve rod is realized by controlling the liquid flow to generate the pressure difference. SUMMARY

[0003] In view of the above problems, the utility model provides a valve rod drive arrangement and load sensitive valve to solve the problem that the movement of the valve rod is controlled by the electromagnetic valve in the prior art and the control precision and response speed are slightly insufficient.

[0004] The utility model discloses a valve rod drive arrangement, including the casing, the through -hole that can supply the valve rod is passed and is arranged on the casing, fixed mounting has the motor in the casing, the output shaft of motor is connected with the connecting block through the transmission mechanism, and the connecting block is used for connecting the valve rod to drive the axial movement of the valve rod.

[0005] Through the above structure, the motor is used to drive the connecting block directly, and then the transverse movement of the valve rod is driven, and the movement position and distance of the valve rod can be directly controlled by the motor, and the valve rod switching is more timely without the flow pressure regulating process of the pressure oil, so that the response speed is faster.

[0006] Preferably, the mounting frame is fixedly installed in the casing, the motor is fixedly connected with the mounting frame, the transmission mechanism includes the first gear fixedly connected with the output shaft of the motor, the second gear meshing with the first gear is rotatably installed on the mounting frame, and the third gear is fixedly connected with the second gear on the same shaft; the end, away from the valve rod, of the connecting block is fixedly connected with the rack, and the rack is meshed with the third gear. Through the transmission of the plurality of gears and the cooperation with the rack, the structure of the device is simpler, and the position of the valve rod is more convenient to control.

[0007] Preferably, the mounting block is fixedly installed on the mounting frame, and the pressing block for pressing the rack on the third gear is installed on the mounting block. Through the setting of the pressing block, the rack can be more stably meshed with the third gear, and the stability of the device is further increased.

[0008] Preferably, the pressing block is round, and the pressing block is rotatably connected with the mounting block. Through the arrangement that the mounting frame is rotatably connected with the pressing block and the pressing block is round, when the rack moves, the friction between the rack and the pressing block is rolling friction, the friction is smaller, the wear is smaller, the movement of the rack is smoother, and the stability of the device is further improved.

[0009] Preferably, the front view of the mounting frame is transversely ''J'' shaped. Through the arrangement of the ''J'' shaped mounting frame, the mounting frame can be fixedly connected with the motor, the second gear and the mounting block at the same time, so that the structure of the device is more compact and more space-saving.

[0010] A load-sensitive valve using a valve rod driving device, comprising a valve body, one side of the valve body being fixedly connected with a machine shell, a valve rod being slidably installed on the valve body, the valve rod being provided with a third groove at an end close to the machine shell, a connecting block being located in the third groove, and a limiting mechanism for positioning the connecting block being further provided in the third groove.

[0011] Through the above structure, the motor controls the axial movement of the connecting block through the transmission mechanism, and then drives the axial movement of the valve rod, so as to control the opening and closing of the oil passage in the valve body, so that the device can more quickly control the movement of the valve rod, and more accurately control the opening of each oil passage, facilitating the adjustment of the oil pressure in the valve body.

[0012] Preferably, the limiting mechanism comprises a spring located in the third groove, the spring being arranged between an end of the connecting block away from the machine shell and an inner wall of the third groove, the spring being in a compressed state, and a check ring for preventing the connecting block from moving away from the spring being further installed on a side wall of the third groove. Through the cooperation of the spring and the check ring, the position of the connecting block in the third groove is more accurate, that is, the connecting position of the connecting block and the valve rod is more accurate, and the accuracy of the movement of the valve rod in the device is further improved.

[0013] Preferably, an annular second groove is arranged on a side wall of the third groove close to the groove, and the check ring is clamped in the second groove. Through the clamping of the check ring in the second groove, the installation of the check ring is more convenient.

[0014] Preferably, an end of the valve rod close to the connecting block is further provided with a first groove in communication with the second groove. Through the arrangement of the first groove, the disassembly of the check ring is more convenient, and then the separation of the connecting block and the valve rod is more convenient.

[0015] Preferably, a side surface of the connecting block is a spherical surface, the third groove is a cylindrical groove, the diameter of the spherical surface of the connecting block is equal to the diameter of the third groove, and the diameter of the spherical surface of the connecting block is greater than the inner diameter of the check ring. Through the arrangement of the spherical surface, the linear contact between the connecting block and the third groove is realized, the contact area is smaller, the friction loss is smaller, and the installation and disassembly of the connecting block are more convenient.

[0016] In summary, the utility model has the advantages that:

[0017] 1. By using the motor to drive the movement of the connecting block, and then drive the movement of the valve rod, compared with the electromagnetic valve driving the movement of the valve rod, the motor driving lacks the process of forming the pressure difference by the pilot pressure oil flow, so that the device drives the valve rod to move in a more direct way, and the response speed is faster; in addition, the mechanical connection mode controlled by the motor also makes it more convenient to control the distance of the valve rod movement, and the control precision is also higher.

[0018] 2. By the cooperation of the connecting block with the spherical side, the spring and the check ring, the spring is always in a compressed state, so that the spring always has a pushing force to the connecting block, and because of the existence of the check ring, the connecting block cannot move to the direction of the machine shell, so that the position of the connecting block connected with the valve rod is always fixed, and the error is smaller when confirming the movement position of the valve rod, that is, the control precision of the valve rod is higher. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure diagram of the driving device in the utility model;

[0020] Figure 2 It is the first perspective axonometric drawing of the internal structure of the driving device;

[0021] Figure 3 It is the second perspective axonometric drawing of the internal structure of the driving device;

[0022] Figure 4 It is the front view of Figure 3 ;

[0023] Figure 5 It is a structure diagram of the cooperation of the valve rod and the connecting block;

[0024] Figure 6 It is a use scene diagram of the device;

[0025] Figure 7 It is the front view of Figure 5 ;

[0026] Figure 8 It is the partial enlarged view of the "B" area in Figure 6 .

[0027] In the drawing: 1-machine shell; 2-through hole; 3-connecting block; 4-motor; 5-mounting frame; 6-first gear; 7-second gear; 8-third gear; 9-rack; 10-mounting block; 11-pressing block; 12-valve rod; 13-spring; 14-valve body; 15-valve cavity; 16-first groove; 17-second groove; 18-check ring; 19-third groove. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings.

[0031] As shown in Figures 1 to 6 The present application provides a valve rod driving device, which comprises a casing 1, the casing 1 is provided with a through hole 2 for the valve rod 12 to pass through, a motor 4 is fixedly installed in the casing 1, specifically, the motor 4 in the present device adopts a servo motor 4. The output shaft of the motor 4 is drivingly connected with a connecting block 3 through a transmission mechanism, the connecting block 3 is used for connecting the valve rod 12 to drive the valve rod 12 to move axially in the valve cavity 15.

[0032] Among them, the transmission mechanism mentioned above can be any mechanism that can be driven by the motor 4 and drive the connecting block to move, for example, the motor 4 output shaft is drivingly connected with a threaded column through a gear set, a threaded sleeve is sleeved on the outer side of the threaded column, the threaded sleeve is slidingly installed in the casing 1, and the end of the threaded sleeve away from the threaded column is fixedly connected with the connecting block 3.

[0033] The threaded column and the threaded sleeve are only one of the embodiments of the transmission mechanism, in addition, another embodiment is also provided in the present application, specifically, the transmission mechanism comprises a first gear 6 coaxially fixedly connected with the output shaft of the motor 4, a mounting bracket 5 is also fixedly installed in the casing 1, the mounting bracket 5 is rotatably installed with a second gear 7 engaged with the first gear 6, and a third gear 8 is coaxially fixedly connected with the second gear 7; the end of the connecting block 3 away from the valve rod 12 is fixedly connected with a rack 9, and the rack 9 is engaged with the third gear 8. The motor 4 is also fixedly connected with the mounting bracket 5.

[0034] Since the rack 9 is fixedly connected with the connecting block 3 at one end and is not limited at the other end, although the connecting block 3 is connected with the valve rod 12 and the valve rod 12 is limited by the valve cavity 15, the end of the rack 9 away from the connecting block 3 is still a certain distance away from the valve rod 12, and when the third gear 8 and the rack 9 are in transmission, the rack 9 is prone to floating up and down, resulting in that the meshing between the two is not very good, therefore, the mounting block 10 is fixedly installed on the mounting frame 5, the pressing block 11 for pressing the rack 9 on the third gear 8 is installed on the mounting block 10, so that the rack 9 and the third gear 8 can be more stably meshed, and the transmission of the rack 9 and the third gear 8 is more stable.

[0035] The pressing block 11 in the above can be fixed, that is, the friction between the pressing block 11 and the rack 9 is sliding friction, but since the friction of sliding friction is large, the friction loss is high, therefore, the pressing block 11 is arranged in a circular wheel shape, and the pressing block 11 is rotatably installed on the mounting block 10, so that the friction between the pressing block 11 and the rack 9 is converted from sliding friction to rolling friction, the friction between the pressing block 11 and the rack 9 is smaller, the friction loss is lower, and the movement of the rack 9 is more smooth.

[0036] As a further illustration of the present example, the front view of the mounting frame 5 is transversely "J" shaped. The motor 4 and the second gear 7 in the device are installed on the longer edge of the mounting frame 5, and the mounting block 10 is installed on the shorter edge opposite to the longer edge, so that the structure of the device is more simple and compact, and the installation space of the load-sensitive combined valve is saved.

[0037] As shown in Figures 5 to 8 The utility model also provides a load-sensitive valve using the above-mentioned driving device, which comprises a valve body 14, one side of the valve body 14 being fixedly connected with the casing 1 in the valve rod driving device. A valve cavity 15 is arranged in the middle of the valve body 14, and a valve rod 12 is slidably installed on the valve cavity 15. One end of the valve rod 12 close to the casing 1 is provided with a third groove 19, the connecting block 3 is located in the third groove 19, and a limiting mechanism for positioning the connecting block 3 is further arranged in the third groove 19.

[0038] The main function of the valve rod 12 is to switch the communication between various oil channels in the valve body 14, which belongs to the prior art, and the communication between various oil channels does not belong to the main point of the utility model, so it is not described in detail here.

[0039] The limiting mechanism can be any mechanism for limiting the connection block 3, such as a clamping groove provided on the connection block 3 and a clamping block provided on the side wall of the third groove 19 and capable of being inserted into the clamping groove. However, this clamping method has a disadvantage that the clamping block is usually slightly smaller than the clamping groove in size so as to facilitate the insertion of the clamping block into the clamping groove, and thus a small error exists in the movement of the valve rod 12.

[0040] In order to minimize the error, the limiting mechanism in the embodiment comprises a spring 13 provided in the third groove 19. The spring 13 is provided between the end of the connection block 3 away from the casing 1 and the inner wall of the third groove 19. The spring 13 has a large spring constant and is always in a compressed state after the installation of the connection block 3. A retaining ring 18 is further provided on the side wall of the third groove 19 at the opening of the third groove 19 and is used to prevent the movement of the connection block 3 away from the spring 13.

[0041] The retaining ring 18 is a circular steel ring. During the installation of the connection block 3 and the valve rod 12, the spring 13 is first provided in the third groove 19, and then the connection block 3 is inserted into the third groove 19 to compress the spring 13. When the connection block 3 passes the position where the retaining ring 18 is installed, the retaining ring 18 is installed, and then the connection block 3 is released. At this time, the connection block 3 is tightly abutted against the retaining ring 18 under the action of the spring 13, that is, the spring 13 and the retaining ring 18 achieve the precise positioning of the connection block 3 and the valve rod 12, thereby further increasing the control precision of the device on the valve rod 12.

[0042] For the further description of the embodiment, in order to facilitate the dismounting and installation of the retaining ring 18, a second annular groove 17 is provided on the side wall of the third groove 19 close to the opening of the third groove 19, and the retaining ring 18 is clamped in the second groove 17.

[0043] When the retaining ring 18 is clamped in the second groove 17, it is not convenient to release the retaining ring 18, and thus a first groove 16 is further provided on the end of the valve rod 12 close to the connection block 3 and is in communication with the second groove 17. When the connection block 3 needs to be dismounted, the retaining ring 18 is only released through the first groove 16, and then the connection block 3 is extracted through the rack 9.

[0044] For the further description of the embodiment, the side surface of the connection block 3 is a spherical surface, the third groove 19 is a cylindrical groove, the diameter of the spherical surface of the connection block 3 is equal to the diameter of the third groove 19, and the middle part of the connection block 3 has the largest size. Through the arrangement of the structure, the size of the connection block 3 is smaller than the third groove 19 at the beginning when the connection block 3 is inserted into the third groove 19, thereby making the connection block 3 more easily inserted into the third groove 19. The equal diameter is provided to ensure that the connection block 3 is tightly combined with the valve rod 12. In addition, the inner diameter of the retaining ring 18 is smaller than the diameter of the spherical surface of the connection block 3, thereby the retaining ring 18 can block the connection block 3.

[0045] The use principle of the device is as follows: when it is needed to control the valve rod 12 to move away from the shell 1, the motor 4 is started, the output shaft of the motor 4 rotates in the positive direction, the rack 9 moves towards the valve rod 12, at this time the connecting block 3 wants to compress the spring 13, but the spring 13 in the device has a large elastic coefficient, so the connecting block 3 will directly push the valve rod 12 to move away from the shell 1 through the spring 13. When it is needed to control the valve rod 12 to move towards the shell 1, the motor 4 is started, the output shaft of the motor 4 rotates in the reverse direction, the rack 9 drives the connecting block 3 to move towards the shell 1, and since the existence of the check ring 18, the connecting block 3 drives the valve rod 12 to move towards the shell 1 through the check ring 18.

[0046] In summary, the valve rod driving device and the load-sensitive valve of the utility model directly drive the movement of the connecting block 3 through the use of the motor 4, and then drive the movement of the valve rod 12, compared with the movement mode of the electromagnetic valve driving the valve rod 12, the driving of the motor 4 lacks the process of the flow of the pilot pressure oil forming the pressure difference, so that the mode of the device driving the valve rod 12 to move is more direct, and the response speed is faster, in addition, the mechanical connection mode controlled by the motor 4 is more convenient to control the distance of the movement of the valve rod 12, and the control precision is also higher, and through the cooperation of the connecting block 3 with the spherical side, the spring 13 and the check ring 18, the spring 13 is always in the compressed state, so that the spring 13 always has a pushing force of the connecting block 3 towards the shell 1, and since the existence of the check ring 18, the connecting block 3 cannot move towards the shell 1, so that the position of the connecting block 3 connected with the valve rod 12 is always fixed, and the error of the movement position of the valve rod 12 is smaller, that is, the control precision of the valve rod 12 is higher.

[0047] The above only describes the preferred embodiments of the utility model, and it should be noted that for ordinary technical personnel in the technical field, some improvements and replacements can be made without departing from the technical principles of the utility model, and these improvements and replacements should also be regarded as the protection range of the utility model.

Claims

1. A valve stem driving device comprising a housing (1) having a through hole (2) for a valve stem (12) to pass through, characterized in that, The motor (4) is fixedly installed in the casing (1), the output shaft of the motor (4) is connected with the connecting block (3) through a transmission mechanism, and the connecting block (3) is used for connecting the valve rod (12) to drive the valve rod (12) to move axially.

2. The valve stem drive apparatus of claim 1, wherein The motor (4) is fixedly connected with the mounting rack (5), the transmission mechanism comprises a first gear (6) which is coaxially fixedly connected with the output shaft of the motor (4), the mounting rack (5) is rotatably provided with a second gear (7) which is engaged with the first gear (6), and the second gear (7) is coaxially fixedly connected with a third gear (8).

3. The valve stem drive apparatus of claim 2, wherein, The mounting rack (5) is fixedly provided with a mounting block (10), and the mounting block (10) is provided with a pressing block (11) for pressing the rack (9) against the third gear (8).

4. The valve stem drive apparatus of claim 3, wherein, The pressing block (11) is in the shape of a round wheel, and the pressing block (11) is rotatably connected with the mounting block (10).

5. The valve stem drive apparatus of claim 3, wherein, The front view of the mounting rack (5) is in the shape of a horizontal "J".

6. A load-sensing valve using the valve stem drive device according to any one of claims 1 to 5, comprising a valve body (14), characterized in that, One side of the valve body (14) is fixedly connected with the casing (1), the valve rod (12) is slidably installed on the valve body (14), one end of the valve rod (12) close to the casing (1) is provided with a third groove (19), the connecting block (3) is located in the third groove (19), and the third groove (19) is further provided with a limiting mechanism for positioning the connecting block (3).

7. The load sensing valve of claim 6, wherein, The limiting mechanism comprises a spring (13) located in the third groove (19), the spring (13) is arranged between one end of the connecting block (3) away from the casing (1) and the inner wall of the third groove (19), the spring (13) is in a compressed state, and the side wall of the third groove (19) is further provided with a check ring (18) for preventing the connecting block (3) from moving away from the spring (13).

8. The load sensing valve of claim 7, wherein, The side wall of the third groove (19) close to the slot is provided with an annular second groove (17), and the check ring (18) is clamped in the second groove (17).

9. The load sensing valve of claim 8, wherein, One end of the valve rod (12) close to the connecting block (3) is further provided with a first groove (16) in communication with the second groove (17).

10. The load sensing valve of claim 6, wherein, The side surface of the connecting block (3) is a spherical surface, the third groove (19) is a cylindrical groove, the diameter of the spherical surface of the connecting block (3) is equal to the diameter of the third groove (19), and the diameter of the spherical surface of the connecting block (3) is greater than the inner diameter of the check ring (18).

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