KR100915611B1 - Central block for providing and controlling a liquidity to a application device with outer spool guide which is capable of spool position control - Google Patents

Abstract

A central block for providing and controlling fluid pressure to an application device is provided to reduce the maintenance cost and facilitate holding and displacing the inner spool. A central block for providing and controlling fluid pressure to an application device comprises a body, a spool assembly, and an inner spool position controller(700). The spool assembly comprises an outer spool guide(600) and an inner spool(500). The inner spool position controller determines the location of the inner spool at the end of a spool assembly hole(110), and is composed of a grip part(710) and a grip body(720) supporting the grip part. The inner periphery of the grip part is reverse-tapered to the inside so as to maximize the contact area between the grip part and the inner spool. And, a stop protrusion is protruded from the inner periphery of the grip part toward the center in order to facilitate position control of the inner spool.

Description

Central block for providing and controlling a liquidity to a application device with outer spool guide which is capable of spool position control}

The present invention relates to a central box for adjusting the flow rate and hydraulic pressure to the application, more specifically, the external spool guide is additionally mounted, the position of the internal spool is more easily controlled, the exchange of parts, maintenance and flow path A central box has become easier to open and close control.

Applications using hydraulics, such as agricultural machinery and presses, require a certain pressure or more. In order to provide this hydraulic pressure, the pump is used to regulate the hydraulic pressure exerted externally by the application by drawing a constant or linear flow into or out of the tank to the application. A central block is located between the pump and the application to control this hydraulic pressure.

1 is a view showing a conventional central block, Figures 2a and 2b is a view showing the principle of operation of the spool in the conventional central block.

The conventional central block 1 comprises a body 10 and a spool 50. Body 10 provides a flow path between pump 30 and application 20. The body 10 is formed with a pressure path 15, a pressure reduction path 14, a spool hole 11, a pump path 18 and a drain path 13. The flow rate introduced into the spool hole 11 through the pump 30 and the pump path 918 is routed by the spool 50. At the time of pressurization to the application device 20, the spool 50 pressurizes the hydraulic pressure to the pressurization path 15. The flow rate remaining without being pressurized is introduced into the tank 40 through the drain path 13 and the drain pipe 41.

2A and 2B show the principle in which the spool 50 operates.

The spool 50 inserted into the spool hole 11 is a cylindrical member in which through holes 51a and 51b and partition walls 514 and 516 are formed. The flow rate introduced through the pump path 18 is introduced into the pressure path 15 through the spaces separated by the partitions 514 and 516 and the through holes 51a and 51b. In FIG. 2A, since the flow rate drawn from the pump 18 is blocked by the partitions 514 and 516, the flow rate is not drawn into the pressure path 15. However, when the spool 50 moves in FIG. 2B, the flow rate introduced through the pump path 18 may flow in the order of the lower passage hole 51a-> the upper passage hole 51b-> the pressing passage 15. . At this time, the outflow to the outside by the partitions 52 and 54 is prohibited, and is discharged only to the pressure path 15. In addition, the flow rate exceeding the pressure drawn into the pump path 18 is discharged to the drain path 13 and drawn back into the tank.

However, according to the central block having the structure of the conventional spool, since the spool determines the flow path while sliding in the spool hole formed in the central block, the inner surface s of the spool hole is worn out due to the repeated operation of the spool. It is easy to generate play between the spool and the spool hole, and in this case, a problem arises in that the entire body 10 of the central block needs to be replaced.

In addition, changing the spool hole to a high wear-resistant material in order to reduce such wear causes a problem of an increase in material cost because the entire central block must be used with a high wear-resistant material.

Also, in general, the central block is intricately connected to pumps, tanks, and other pipes. In the case of wear of the spool hole, all of these connections must be disassembled in order to replace the entire central block. This is much more complicated and the cost of doing so increases.

In addition, since the position of the spool in the spool hole is not fixed, it is not easy for the user to determine the position of the spool in order to open and close the flow path. That is, the position control of the spool is not easy.

In addition, since the position fixing of the spool is not hard, it is not easy to control the position of the spool for opening and closing the flow path.

Accordingly, the present invention has been made to solve this problem, the object of the present invention is to simplify the maintenance of the central block in the wear of the spool hole and to reduce the material cost, the user to control the position of the spool for opening and closing the flow path It is to provide a central block that can be made easier.

The present invention for solving the above problems in the system for transmitting the flow rate stored in the tank 40 to the application device 20 using the pump 30, between the pump 30 and the application device 20 In the central block 900 to select the flow path provided to the application device and to adjust the hydraulic pressure, the central block 100, the flow rate is passed between the application device and the pump and the tank A body 100 in which a flow path is formed; And a spool assembly 800 inserted into the body 100 to adjust a flow rate flowing from the pump to the application device, wherein the body 100 has a pressure path of the flow rate to the application device 20. Phosphorus application pressure passages 15a and 15b; An application decompression passage 14 which is a decompression path of the flow rate to the application device 20; A pump flow path 18 which is a path through which the flow rate flows from the pump 30; A spool assembly hole 110 disposed between the pump flow path and the application pressure flow passage, into which the spool assembly 800 is inserted; A first drain passage 13 connected to the tank 40 from the spool assembly hole 110; Second drain passages 12a and 12b connected from the pump passage 18 to the tank 40, wherein the spool assembly 800 is a cylindrical member inserted into the spool assembly hole 110. An outer spool guide 600 including an outer through hole 621, 623, 625 in the outer surface of the cylindrical member and an outer guide partition wall 612, 614, 616 protruding from the outer circumferential surface of the cylindrical member in the direction of the inner circumferential surface of the spool assembly hole 110. ); And a cylindrical member inserted into the outer spool guide 600 and closed at one end thereof, from the inner circumferential surface of the cylindrical member through a hole-shaped inner through hole 510 and an outer circumferential surface of the cylindrical member. The inner spool 500 includes an inner spool partition wall 512, 514, 516 protruding toward the inner circumferential surface of the outer spool 500, the inner spool 500 is generated by sliding the inside of the outer spool guide 600 ( 621, 23, 625, the outer guide bulkheads (614, 616), the inner spool bulkheads (514, 516) and the combination of the position of the inner passage hole 510 to determine the flow path flowing into the application device, the spool assembly hole 110 An end further includes an inner spool position control unit 700 for determining the position of the inner spool, wherein the inner spool position control unit 700, as a cylindrical member so as to grab the inner spool 500. More than A grip portion 710 having a longitudinal gap formed therein; And a grip body 720 supporting the grip part from the bottom and connecting the inner spool 500 to the spool assembly hole 110. The inner circumferential surface of the grip part moves inward from the inlet of the grip part. It is anti-tapering and the end of the inner circumferential surface of the grip portion is characterized in that the progress preventing jaw 714 protruding in the centrifugal direction is formed.

In one embodiment, the inlet portion of the inner circumferential surface of the grip portion 710 of the inner spool position control unit 700 is tapered (tapering) toward the inlet.

In one embodiment, the inner spool position control unit 700, characterized in that it further comprises an elastic portion 730 for supporting the lower end of the grip portion 710 in the interior of the grip body 720 as a spring shape. .

In one embodiment, the spool assembly hole 110 is formed so that the inlet portion of the body 100 stepped, the end of the outer spool guide 600 stepped in a shape corresponding to the inlet portion of the stepped body It is formed to be, characterized in that the depth to which the outer spool guide 600 is inserted is limited.

In one embodiment, the spool assembly hole 110 is formed to step so that the inner diameter becomes wider as it proceeds to the inlet portion of the body, the outer partitions 115, 116, 117 of the outer spool guide 600 is formed to step By forming stepped in a shape corresponding to the inner diameter of the assembly hole 110, the space formed by the flow path selected by the movement of the inner spool 500 is defined by the stepped outer partition wall (115, 116, 117) It is characterized by.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

3 is a view showing a central block 900 according to the present invention, Figures 4a and 4b is a view showing the structure and operation of the spool assembly 800 of the present invention.

The central block 900 according to the present invention includes a body 100 and a spool assembly 800.

As described above, the central block 900 transfers the flow rate stored in the tank 40 to the application device 20 using the pump 30, and between the pump 30 and the application device 20. Position to control the flow path and hydraulic pressure provided to the application.

The body 100 has a flow path through which a flow rate passes between the application device 20, the pump 30, and the tank 40. The body 100 is provided from the application pressure reducing passages 14a and 15b which are the pressure passages of the flow rates to the application device 20, the application pressure reduction passage 14 and the pump 30, which are pressure reducing paths of the flow rates to the application device 20. A pump flow path (18), a path through which a flow rate flows, is located between the pump flow path and the application pressure flow path, and the spool assembly hole (110) into which the spool assembly 800 is inserted, from the spool assembly hole (110) to the tank (40). And a first drain passage 13a connected thereto, and second drain passages 12a and 12b connected to the tank 40 from the pump passage 18.

In Figures 4a and 4b, the spool assembly 800 is inserted into the body 100 to adjust the flow rate flowing from the pump to the application, the spool assembly 800 is the outer spool guide 600 and the inner spool ( 500).

The outer spool guide 600 is a cylindrical member inserted into the spool assembly hole 110. The outer spool guide 600 is formed on the outer surface of the cylindrical member from the outer circumferential surface of the cylindrical outer member through holes 621, 623, 625 and the cylindrical member of the spool assembly hole 110. Outer guide partition walls 612, 614, 616 protruding in the inner circumferential surface direction are formed.

The inner spool 500 is inserted into the outer spool guide 600 and is a cylindrical member whose one end is blocked. The inner spool 500 includes a hole-shaped inner through hole 510 formed in the outer surface of the cylindrical member and inner spool partition walls 512, 514, 516 protruding from the outer circumferential surface of the cylindrical member in the direction of the inner circumferential surface of the outer spool guide 600. .

4A and 4B, the operation of the spool assembly will be described.

First, the outer spool guide 600 is inserted into the spool assembly hole 110. At this time, the first outer through hole 621 of the outer through holes (621, 623, 625) formed in the outer spool guide is connected to the application pressure passage 15, the second outer through hole 623 and the application pressure passage (15) The third external through hole 625 is positioned at a position connected to the application pressure reducing passage 14 at a position not connected to any flow path of the application pressure reducing passage 14 and at the same time as the pump passage 18. The outer spool guide 600 is inserted into the spool assembly hole 110. Here, 'connected position' means that the space is separated by the outer guide partitions (612, 614, 616) to communicate with each other.

In FIG. 4A, the inner spool 500 is inserted into the outer spool guide 600. In FIG. 4A, the flow rate introduced into the pump path 18 is sequentially introduced into the outer passage hole 623-> the inner passage hole 510a, but the application pressure flow path 15 is formed by the position combination of the inner spool partition wall and the outer spool partition wall. Not meet). Therefore, the introduced flow rate is discharged to the drain flow path 13.

It is different in FIG. 4B. Because, the flow rate introduced into the pump path 18 due to the sliding of the inner spool 500 is the outer passage hole (623)-> inner passage hole (510a)-> inner passage hole (510b)-> outer passage hole (621) It may be introduced into the pressure path (15) through). In other words, in the spool assembly of the present invention, the inner spool 500 is formed by sliding in the outer spool guide 600, the outer through-holes (621, 23, 625), the outer guide partitions (612, 614, 616), the inner spool partitions (514, 516) and the inner The flow path introduced into the application device 20 is determined by the combination of the positions of the through holes 510.

According to the present invention, since the inner spool 500 is inserted into the outer spool guide 600 while the outer spool guide 600 is inserted into the spool assembly hole 110, the spool assembly hole 110 is not worn. As a result, there is no need to replace the central block due to abrasion during repeated operation of the inner spool. That is, since only the external spool guide 600 needs to be replaced instead of the entire central block, component replacement cost is reduced. In general, since the part price of the central block is 20 to 50 times higher than the part price of the external spool guide, the effect of reducing the part price is very large.

In addition, in particular, the central block has a complicated connection between the pump, the tank and the external piping. Since the central block does not need to be replaced, it is very easy to replace parts, that is, maintenance work. Facilitating maintenance work results in a reduction in the cost of manpower spent on maintenance work, which in turn can lead to a reduction in maintenance costs.

In addition, according to the invention, the cost is reduced when changing the material of the part to reduce wear. This is because in the present invention, instead of changing the entire material of the central block, only the material of the outer spool guide needs to be changed. In other words, according to the present invention, the cost required to increase the durability according to the application of the central block is reduced.

In a variant embodiment of the invention, the body 100 further comprises a pilot check valve hole 17 and a relief valve hole 16.

The pilot check valve hole 17 is a hole-shaped member located on the application pressure passages 15a and 15b, into which a pilot check valve (PCV), which is a valve for maintaining hydraulic pressure pressurized by an application device, is inserted. It is a hole-shaped member. The pilot check valve is a valve that pressurizes separately from the outside to prevent a phenomenon in which the hydraulic pressure pressurized by the application device is minutely reduced by leakage, and thus the description thereof is omitted since the operation of the valve itself is well known to those skilled in the art. .

In addition, the relief valve hole 16 is a hole-shaped member located between the pump flow path and the tank, into which a relief valve (RV), which is a valve for preventing excessive pressurization of the flow rate to the application device, is inserted. It is a hole-shaped member. The operation of the relief valve itself is also well known in the art.

According to this embodiment, the first pilot check valve is formed by arranging the space in which the pilot check valve and the relief valve are formed in the central block, in particular, between the application pressure flow path and the flow path between the pump flow path and the tank. And the installation of the relief valve is easy, and secondly, it is possible to reduce the size of the third central block product without the need for additional equipment for the installation of such a valve.

In a modified embodiment of the present invention, the spool assembly hole 110 is formed so that the inlet portion of the body 100 stepped, the end of the outer spool guide 600 in a shape corresponding to the inlet portion of the stepped body formed It is formed to be stepped, characterized in that the depth to which the outer spool guide 600 is inserted is limited. In FIG. 3, the spool assembly hole 110 has a structure in which the inlet portion 114 is stepped, and the end 601 of the outer spool guide 600 is also stepped so as to correspond to the inlet portion 114.

According to this embodiment, the insertion depth of the external spool guide 600 inserted into the spool assembly hole 110 is stopped (limited) by the stepped structure, whereby the insertion position of the external spool guide can be fixed. That is, according to the present embodiment, the user only needs to insert the external spool guide 600 into the spool assembly hole 110 to the end by a predetermined depth. It is easy to install and replace because there is no need to consider the relative position of external through hole. In particular, the present invention further increases this effect because the combination of the positions of the outer passage holes (621, 23, 625), the outer guide partitions (612, 614, 616), the inner spool bulkheads (514, 516), and the inner passage hole (510) is important for determining the flow path. do.

5 is a diagram illustrating a central block according to another embodiment of the present invention.

In a modified embodiment of the present invention, the spool assembly hole 110 is formed so as to step so that the inner diameter becomes wider as it proceeds to the inlet portion of the body, the outer partition walls 115, 116, 117 of the outer spool guide 600 so as to step Since the formed spool assembly hole 110 is formed to be stepped in a shape corresponding to the inner diameter of the formed spool assembly hole, the space formed by the flow path selected by the movement of the inner spool 500 is formed by the stepped outer partition walls 115, 116 and 117. It is characterized by being limited.

In Figure 5, the spool assembly hole 110 is stepped so that the inner diameter is wider as it proceeds to the inlet portion of the body. That is, the spool assembly hole 110 has a first step 115, a second step 116, and a third step 117 from the inside, and the outer partitions 612, 614, and 616 of the outer spool guide 600 have the first to It protrudes by a height corresponding to the fourth step.

This step provides a vertical plane, which is easier to achieve a closed structure. That is, according to the present embodiment, the space formed by the flow path selected by the movement of the inner spool 500 is defined by the vertical structure by the stepped outer partitions 115, 116, and 117, so that the outer partition of the outer spool guide ( 612, 614, 616 and the clearance between the inner surface of the spool assembly hole 110 can be reduced and more closely. That is, if the play between the spool assembly hole 110 and the outer bulkheads (612, 614, 616) occurs by repeated use, the user further pushes the outer spool guide in the horizontal direction to bring it into close contact or the vertical surface of the step (not the horizontal plane). Increased play can be eliminated by inserting sealants, such as O-rings. This embodiment solves the problem caused by the fact that it is not possible to increase the diameter of the outer partition to reduce the play when the play occurs by repeated use.

6A to 6D are photographs showing the actual product of the present invention.

6A is a cross-sectional view of a central block in accordance with the present invention. It can be seen that the upper, lower, and side surfaces are formed with the entrances of the various flow paths and holes shown in FIG. 3 (the central block has several flow paths or holes formed in a solid structure inside).

6B is a photograph showing a state in which the spool assembly is inserted into the spool assembly hole. The spool assembly 800 is inserted into the spool assembly hole 110. A stepped shape can be seen as the inner diameter of the spool assembly hole increases toward the inlet.

6C illustrates the spool assembly 800. A step 118 is formed at the end of the spool assembly. As described in the modified embodiment of Figure 3, to limit the depth to which the spool assembly is inserted.

6d is an exploded view of the spool assembly, and shows the outer spool guide 600 and the inner spool 500. Referring to FIG. 6B, it can be seen that the external spool guide 600 is inserted into the spool assembly hole 110 and the inner spool 500 is inserted into the external spool guide 600. Due to this structure, it is necessary to replace only the spool assembly 800 or even the external spool guide 600 without having to replace the entire central block 100 when worn due to repetitive action. This is easy.

Hereinafter, an embodiment including the internal spool position control unit 700 and modified embodiments thereof will be described with reference to FIGS. 7A to 12.

7A and 7B are cross-sectional views of the spool assembly 800 according to an embodiment of the present invention, in which the inner spool 500 is moved to the left and right to open and close the flow path, and FIGS. 8A and 8B are internal views. The figure which shows the spool position control part 700 is shown.

In FIG. 7, the central block 900 according to the present invention further includes an internal spool position control unit 700. As shown in FIG. 8A, the internal spool position control unit 700 includes a grip 710 and a grip body 720.

The grip part 710 is a cylindrical member having one or more longitudinal gaps 713, and serves to grip the inner spool 500 from the outside. The grip part 710 has a gap 713 formed in the longitudinal direction. The gap 713 is to provide elasticity that allows the grip portion 710 to be properly opened by a predetermined width when the inner spool 500 is inserted. In one embodiment, grip portion 710 is formed of a metallic material to provide elasticity, preferably copper.

The lower part of the grip part 710 is fixed to the grip body 720. The grip body 720 is a cylindrical member, the threaded surface 721 is formed on the outer peripheral surface of the cylindrical member, the center of the grip body 720 discharged in the form of a hole extending in parallel with the grip portion 710 A ball 726 is formed. The grip body 720 serves to support the grip portion 710 from the bottom.

As shown in FIG. 7A, the grip body 720 is fixed to the end of the spool assembly hole 110. When the inner spool 500 is fixed to the grip part 710, the end of the inner spool 500 is inserted in a state in which the end of the inner spool 500 faces the insertion hole 712 of the grip part 710.

In the present invention, the travel prevention jaw 714 is formed at the inner side end of the inner circumferential surface 716 of the grip portion 710. The progress prevention jaw 714 has a shape protruding in the center direction of the insertion hole 712 of the grip portion so that a portion of the inner circumferential surface 716 forms a diameter smaller than the outer diameter of the inner spool 500.

In the present invention, the inner circumferential surface 716 of the grip portion 710 is characterized in that the anti-tapering as it proceeds to the interior of the grip portion (710). That is, the inner circumferential surface 716 of the grip 710 has a shape in which the diameter of the inner circumferential surface increases as it proceeds inward from the entrance of the grip 710. This reverse tapering structure maximizes the area where the grip portion 710 contacts the inner spool 500 when the inner spool 500 is inserted so that the inner spool 500 is more accurately vertically and harder. To be fixed at This effect will be described in more detail with reference to Figs. 9A to 9B.

In one embodiment, the inlet portion 118 of the inner circumferential surface 116 of the grip portion 710 is characterized in that the tapering (tapering) toward the opening. This is to provide an entry gap so that the inner spool 500 can more easily enter the inside of the grip 710.

8B is a view illustrating detailed specifications of the grip part 710 of the internal spool position control part 700.

In order for the inner spool 500 to be fixed perpendicularly perpendicular to the grip portion 710, the drill diameter w 4, which is the diameter of the inner spool 500, is preferably equal to the final diameter w 2 of the grip portion 710. Since the inner circumferential surface 716 of the grip portion 710 is reverse tapered in the present invention, the grip diameter w1 of the grip portion 710 is smaller than the final diameter w2 of the grip portion 710.

In addition, since the inlet portion 718 of the inner circumferential surface 716 of the grip portion 710 is tapered in a way that opens toward the inlet to facilitate the initial entry of the inner spool 500, the grip portion 710 The entry diameter w3 of is larger than the entry diameter w1 and the final diameter w2.

By this shape, the tapering angle b of the inlet of the grip part 710 and the reverse tapering angle a of the inner peripheral surface of the grip part 710 are formed. The tapering angle b is an angle that determines how much the inlet should be opened to facilitate the entry of the inner spool 500, and the reverse tapering angle a is the grip part 710 to fix the entered inner spool 500 more firmly. Is the angle that determines to what extent the inner circumferential surface of U must be reverse tapered.

The length l2 of the grip portion representing the length from the inlet of the grip portion 710 to the travel prevention jaw 714 is greater than the length l1 of the inner circumferential surface 716 of the grip portion 710. This is because the inlet portion of the grip portion 710 is tapered. That is, the tapered portion 718 no longer contacts the outer circumferential surface of the inner spool 500 after the grip is completed.

Applicants have shown through experiments that the reverse tapered angle is preferably in the range of 1.0 to 2.5 degrees with respect to the diameter of the inner spool 500 that is generally used. If it is smaller than this range, it is because the contact area increase effect by reverse tapering does not occur. If it is larger than this range, entry of the inner spool 500 is not easy.

Applicant also preferred that the tapered angle is in the range of 35 to 45 degrees. If too large or small, the entry of the inner spool 500 is not easy.

9A and 9B are views showing the first effect of the embodiment of FIG. 7, and FIG. 9A is a view showing a case where the inner spool 500 is gripped by a conventional grip shape, and FIG. 9B is inclined as in the present invention. It is a figure which shows the situation which grips the internal spool 500 by the grip part 710. As shown in FIG.

According to the present invention, since the grip part 710 can grab the inner spool 500 more firmly, the opening / closing whether the opening or closing the flow path by the movement of the inner spool is more reliably controlled.

FIG. 9A is a state diagram when the inner spool 500 is fixed to a conventional general grip device, that is, a grip device 920 (hereinafter, referred to as a conventional grip device) formed in a direction parallel to the entry direction without reverse tapering. It is a state diagram when the inner spool 500 is fixed to the grip part 710 of this invention.

As shown in FIG. 9A, when the inner spool 500 is inserted into the conventional grip device 920, the grip device is opened as the inner spool 500 is inserted into the grip device 920. The area of the portion B where the outer surface of 500 and the inner circumferential surface 926 of the grip portion contact is very narrow. Because, the conventional grip device is a structure for fixing the inner spool 500 by using elastic, for this purpose, the diameter of the grip portion of the inner spool 500 so that the grip can fix the fixing portion of the inner spool 500. It is because it is formed a little smaller than the diameter of the government.

That is, since the inner circumferential surface of the conventional grip device 920 is not reverse tapered, the grip portion is perpendicular to the outer circumferential surface of the inner spool and the inner circumferential surface 526 is the inner spool 500 before the inner spool 500 is inserted. Although the state is parallel to, the state after insertion is opened as shown in the right figure (when the structure does not open like this, the grip portion cannot properly grasp the inner spool 500). Due to this opening structure, the outer circumferential surface of the inner spool 500 and the inner circumferential surface 926 of the grip device have a very small contact surface B as shown in the right figure of FIG. 9A.

In contrast, referring to FIG. 9B, since the inner circumferential surface 916 of the grip portion 710 of the present invention is reverse tapered, the cross section of the grip portion with respect to the inner spool in the state before the inner spool 500 is inserted is rather inlet. Is a narrow trapezoidal structure, but the insertion state is opened as shown in the right figure of FIG. 9B so that the inner circumferential surface 916 of the grip part is perpendicular to and parallel to the inner spool 500. Due to the structure in which the opened state becomes vertical, the contact surface A of the inner spool 500 and the inner circumferential surface 716 of the grip part 710 becomes very large as shown in the right figure of FIG. 9B. Since the contact surface A is larger than the contact surface B, the grip portion 710 according to the present invention can grab the inner spool 500 in a much more precise vertical shape, much more firmly than the conventional grip device 920.

That is, the reverse tapered structure of the grip part 710 forms the inner circumferential surface 716 of the grip part in parallel with the inner circumferential surface of the inner spool 500 in anticipation of the structure after the inner spool 500 is inserted into the grip part. Maximize the contact surface between 716 and the outer circumferential surface of the inner spool.

As such, the position of the inner spool is more firmly fixed by the grip portion of which the inner peripheral surface is tapered reversely. That is, the opening and closing of the flow path is determined according to the position of the inner spool, and since the opening and closing of the flow path is required in the central block of the present invention, the grip part according to the present invention further ensures the certainty of the flow opening and closing control. For example, the possibility of erroneous position control due to external vibration of the mechanical spool or the position of the internal spool is reduced.

10A and 10B are diagrams illustrating a second effect of the embodiment of FIG. 7 and show specifications in a situation in which the flow path is opened and closed because the inner spool 500 is moved left and right.

According to the present invention, when the user manually slides the position of the inner spool, the position of the inner spool for opening and closing the flow path can be recognized and controlled more easily and more accurately.

The interior of the central block that determines the actual flow path is not seen by the user's eyes. When the user decides whether to open or close the flow path by manually moving the inner block, the flow path is determined by inserting the inner block by a predetermined length or withdrawing the flow in the opposite direction (where the flow path is determined by the application pressure flow path of the central block) 15) and the pump path 18 to make the position combination of the inner passage hole (510a, 510b) and the outer passage hole (621, 623) to pass through). However, it is not easy for the user to precisely adjust the movement position of the inner spool, and the inconvenience or difficulty of this operation is further increased when using a number of standard central blocks.

However, according to the present invention, it is possible to accurately move and control the inner spool to the open or closed position based on the sense felt by the user's hand. The method is as follows.

First, in FIG. 10A, the user can slide the inner spool 500 to the first resistance point s1 in the spool assembly hole 110 to close the flow path from the pump path 18 to the application pressure path 15. Of course, in this position, the central block of the present invention has the clearance d1 of the outer spool guide, the grip portion of the outer spool guide so that the inner through holes 510a and 510b and the outer through holes 621 and 623 are not connected when the inner spool reaches the first resistance point s1. The length, the length of the first resistance point s1, etc. must be determined. These specifications need to be determined once, so the user does not have to remember them each time. The user can be sure that the flow is closed by pushing the internal spool to the first resistance point s1 from the outside.

Next, in FIG. 10B, the user can slide the inner spool 500 to the second resistance point s2 in the spool assembly hole 110 to open the flow path from the pump path 18 to the application pressure path 15. . Since the user feels the first resistance by the hand's senses, he can be sure that the second resistance is s2 if he meets a new resistance with the next force. The distance between the resistance points s1 and s2 is the minimum distance the inner spool must move to close or open the flow path.

Accordingly, the user can very easily determine the position of the inner spool for opening and closing of the flow path by using the reach to the resistance point formed by the grip portion 710 of the inner spool position control unit 700 as shown in FIGS. 10A and 10B. Can be controlled.

FIG. 11 is a photographic view illustrating an actual product of the internal spool position control unit 700 according to the embodiment of FIG. 7.

Applicant has produced several prototypes of the internal spool position control unit 700 according to the present invention, and applied directly to the central block. As a result, when the inner spool 500 is fixed to the grip 710, the inner spool can be stably moved by being mounted more accurately, and the user can more easily recognize the inner spool by recognizing two sequential resistance points. It can be seen that the position, i.e., the closing and opening of the flow path can be determined.

12 is a view showing a modified embodiment of the embodiment of FIG.

In one embodiment, as shown in FIG. 12, the inner spool position control unit 700 further includes an elastic unit 730.

The elastic part 730 supports a lower end of the grip part 710 in the grip body 720 as a spring-shaped member.

The elastic part 730 provides elasticity to the grip part 710 so that the grip part 710 can easily grasp the inner spool 500. That is, the grip part 710 is elastically inserted when the inner spool 500 is inserted into the insertion hole 712 of the grip part 710, so that the inner spool that has excessively advanced by the external force P1 of the first user ( Since 500 can be returned to its original direction by the elastic force P2, more accurate position control of the inner spool is possible, and second, the inner spool 500 or the grip part 710 is damaged by the excessive force of the conveying device, which is unlikely to occur. The third elastic part 730 allows the grip portion 710 and the inner spool 500 according to the inaccuracy of the position control of the inner spool by allowing the error (gap) of the entry angle of the inner spool 500 to some extent by elasticity. ) Collision and breakage can be prevented.

When the elastic portion 130 is added, the connection portion 724 for inserting the grip portion 710 is formed in the body 720, the grip portion 710 inside the body 720 through the connection hole 724 Is supported and fixed by the elastic portion 130 in.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, according to the present invention, only when the spool assembly or the external spool guide need to be replaced without the need to replace the entire central block when play occurs due to the repeated operation of the central block by the structure of the added external spool guide. Therefore, the maintenance cost of the central block is reduced.

In addition, according to the present invention, the central block is complicatedly connected to the pump, the tank and the external pipe, there is no need to replace the central block, it is very easy to replace parts, that is, maintenance work.

In addition, according to the invention, the cost is reduced when changing the material of the part to reduce wear. Instead of changing the entire material of the central block, you only need to change the material of the outer spool guide.

In addition, according to the present invention, since the insertion depth of the spool assembly hole is automatically limited by the stepped structure of the inlet end of the spool assembly hole, the installation and maintenance work of the user is facilitated.

In addition, according to the present invention, a stepped structure between the spool assembly hole and the outer spool guide enables a structure of vertical contact between the inner surface of the spool assembly hole and the outer partition of the outer spool guide, thereby further increasing the adhesion. There are a variety of ways to increase the adhesion.

In addition, according to the present invention, the position of the first inner spool can be fixed more accurately and rigidly by the inner spool position control unit, the second user can more easily determine the position of the inner spool for opening and closing control of the flow path.

In particular, according to the present invention, the inner spool of the inner spool position control portion is tapered back, the grip portion of the inner spool can be gripped more firmly, it is possible to maintain a firm fixing even in the repeated operation.

In particular, according to the present invention, the user can more easily control the position of the inner spool by the movement prevention jaw 714 of the inner spool position control unit.

In particular, according to the present invention, by the elastic portion 730 of the inner spool to prevent the impact and damage to the repeated movement of the inner spool, it is possible to prevent the position of the inner spool is separated by excessive external force.

1 is a view showing a conventional central block.

2A and 2B are diagrams illustrating the principle of operation of a spool in a conventional central block.

3 is a diagram illustrating a central block 900 according to the present invention.

4A and 4B illustrate the structure and operation of the spool assembly 800 of the present invention.

5 is a diagram illustrating a central block according to another embodiment of the present invention.

6A to 6D are photographs showing the actual product of the present invention.

7A and 7B are cross-sectional views of the spool assembly 800 according to an embodiment of the present invention, in which the inner spool 500 is moved left and right to open and close the flow path.

8A is a diagram illustrating the internal spool position control unit 700.

8B is a view illustrating detailed specifications of the grip part 710 of the internal spool position control part 700.

9A and 9B are views showing the first effect of the embodiment of FIG. 7, and FIG. 9A is a view showing a case where the inner spool 500 is gripped by a conventional grip shape, and FIG. 9B is inclined as in the present invention. It is a figure which shows the situation which grips the internal spool 500 by the grip part 710. As shown in FIG.

10A and 10B are diagrams illustrating a second effect of the embodiment of FIG. 7 and show specifications in a situation in which the flow path is opened and closed because the inner spool 500 is moved left and right.

FIG. 11 is a photographic view illustrating an actual product of the internal spool position control unit 700 according to the embodiment of FIG. 7.

12 is a view showing a modified embodiment of the embodiment of FIG.

Claims (5)

In the system for transmitting the flow rate stored in the tank 40 to the application device 20 using the pump 30, the flow path provided between the pump 30 and the application device 20 provided to the application device In the central block 900 to select and adjust the hydraulic pressure, The central block 900 may include a body 100 having a flow path through which the flow rate passes between the application device, the pump, and the tank; And a spool assembly 800 inserted into the body 100 to adjust a flow rate flowing from the pump to the application device. The body 100, Application pressure passages 15a and 15b, which are pressure passages of the flow rate to the application device 20; An application decompression passage 14 which is a decompression path of the flow rate to the application device 20; A pump flow path 18 which is a path through which the flow rate flows from the pump 30; A spool assembly hole 110 disposed between the pump flow path and the application pressure flow passage, into which the spool assembly 800 is inserted; A first drain passage 13 connected to the tank 40 from the spool assembly hole 110; A second drain passage (12a, 12b) connected to the tank (40) from the pump passage (18), The spool assembly 800, A cylindrical outer spool guide 600 is inserted into the spool assembly hole 110, the outer surface of the outer spool guide 600 from the outer circumferential surface of the hole-shaped outer through holes (621, 623, 625) and the outer spool guide 600 An outer spool guide 600 including an outer guide partition wall 612, 614, 616 protruding in an inner circumferential direction of the spool assembly hole 110; And A cylindrical inner spool 500 inserted into the outer spool guide 600 and closed at one end thereof, and includes a hole-shaped inner through hole 510 and an inner spool 500 formed on an outer surface of the inner spool 500. An inner spool 500 including inner spool bulkheads 512, 514, 516 protruding from the outer circumferential surface in the direction of the inner circumferential surface of the outer spool guide 600, The inner spool 500 of the outer through-holes (621, 623, 625), the outer guide partitions (614, 616), the inner spool partitions (514, 516) and the inner through hole 510 generated by sliding in the interior of the outer spool guide (600) The flow path into the application is determined by the combination of positions, At the end of the spool assembly hole 110 further includes an inner spool position control unit 700 for determining the position of the inner spool, wherein the inner spool position control unit 700, A grip portion 710 in which at least one longitudinal gap is formed as a cylindrical member so as to grab the inner spool 500; And A grip body 720 supporting the grip part from the bottom and connecting the inner spool 500 to the spool assembly hole 110. The inner circumferential surface of the grip portion is anti-tapering as it proceeds inward from the entrance of the grip portion, The central block, characterized in that formed in the end of the inner peripheral surface of the grip portion protruding bumps (714) protruding in the centrifugal direction. The central block as claimed in claim 1, wherein the inlet portion of the inner circumferential surface of the grip portion 710 of the inner spool position control portion 700 tapers toward the inlet. The method of claim 2, wherein the internal spool position control unit 700, as a spring shape further comprises an elastic portion 730 for supporting the lower end of the grip portion 710 in the interior of the grip body (720) Central block. According to claim 1, The spool assembly hole 110 is formed so as to step so that the inner diameter of the spool assembly hole is wider as it proceeds to the inlet portion of the body 100, The end of the outer spool guide 600 is formed so as to step in a shape corresponding to the inner diameter of the spool assembly hole, the central block, characterized in that the depth to which the outer spool guide 600 is inserted. According to claim 4, The spool assembly hole 110 is formed so as to step so that the inner diameter of the spool assembly hole 100 is wider as it proceeds to the inlet portion of the body 100, The outer partition walls 115, 116, 117 of the outer spool guide 600 are formed to step in a shape corresponding to the inner diameter of the spool assembly hole 110, such that a path of a flow rate selected by the movement of the inner spool 500 is formed. The central block is characterized in that the space to be formed is defined by the outer partition wall (115, 116, 117) of the outer spool guide (600).