A large capacity proportional flow valve

Abstract

The application relates to the technical field of proportional flow valves, and discloses a large-displacement proportional flow valve which comprises a flow valve and a proportional adjusting device, the proportional adjusting device is fixedly connected with a valve rod of the flow valve, adjusting plates are fixedly connected at the two sides of the proportional adjusting device, a protective cylinder is arranged on the outer side of the proportional adjusting device, a sealing cover is fixedly connected to the inner side of the protective cylinder, the sealing cover is slidably connected with the proportional adjusting device and the adjusting plates, a plug-in mechanism is fixedly connected to the top of the outer side of the protective cylinder, clamping columns are arranged at the two sides in the protective cylinder, and fixing mechanisms are fixedly connected to the two sides of the protective cylinder. The proportional flow valve solves the problems that the valve rod of the existing proportional flow valve is exposed during use, the exposed valve rod is prone to rust after long-time use, dust is prone to accumulation at the connecting gap between the flow valve and the valve rod, the valve rod is difficult to rotate, and the use of the valve rod is affected.

Description

Technical Field

[0001] This invention relates to the field of proportional flow valve technology, specifically a large-displacement proportional flow valve. Background Technology

[0002] A proportional flow valve is a combination of a proportional electromagnet and a flow valve. It is a manual adjustment device that replaces a throttle valve or speed control valve with a proportional electromagnet. The opening of the throttle valve is changed by inputting an electrical signal, thereby regulating the flow of the system. Proportional valves are mainly used for speed control in the hydraulic systems of multi-station machine tools, injection molding machines, and imitation silk cotton. They can also be used in remote speed control and automatic speed control systems. When the input signal current is zero, the output flow is zero, so it can be used as a switch to cut off the oil circuit. However, in existing proportional flow valves, the valve stem is exposed. After long-term use, the exposed valve stem is prone to corrosion, and dust easily accumulates in the connection gap between the flow valve and the valve stem, making it difficult to rotate the valve stem and affecting its use. Summary of the Invention

[0003] This invention provides a large-displacement proportional flow valve with the beneficial effect of protecting the valve stem. It solves the problem mentioned in the background art that the valve stem of the existing proportional flow valve is exposed during use, and the exposed valve stem is prone to corrosion after long-term use. In addition, dust is easy to accumulate in the connection gap between the flow valve and the valve stem, which makes it difficult to rotate the valve stem and affects the use of the valve stem.

[0004] The present invention provides the following technical solution: a large displacement proportional flow valve, comprising a flow valve and a proportional adjustment device, wherein the proportional adjustment device is fixedly connected to the valve stem of the flow valve, and adjusting plates are fixedly connected to both sides of the proportional adjustment device; a protective cylinder is sleeved on the outer side of the proportional adjustment device, and a sealing cover is fixedly connected to the inner side of the protective cylinder; the sealing cover is slidably connected to the proportional adjustment device and the adjusting plates; a plug-in mechanism is fixedly connected to the top of the outer side of the protective cylinder; locking posts are provided on both sides inside the protective cylinder; and a fixing mechanism is fixedly connected to both sides of the protective cylinder.

[0005] As an optional embodiment of the large displacement proportional flow valve of the present invention, the plug-in mechanism includes a plug-in box, a handle on one side of the plug-in box, a plug-in post fixedly connected to one side of the handle, one end of the plug-in post passing through the plug-in box, the protective cylinder and the adjusting plate and extending into the interior of the adjusting plate, a sliding plate fixedly connected to the outer side of the plug-in post, and a clamping spring fixedly connected to both ends of one side of the sliding plate, one end of the clamping spring being fixedly connected to the inner wall of the plug-in box, and a plug-in groove corresponding to the plug-in post being opened on one side of the adjusting plate, the number of plug-in grooves being several, and the several plug-in grooves being equidistantly distributed, the plug-in grooves being clearance-fitted with the plug-in post.

[0006] As an optional embodiment of the large displacement proportional flow valve of the present invention, wherein: an extension plate is fixedly connected to both sides of the handle, an annular ring is fixedly connected to the top and bottom of the extension plate, anti-slip particles are fixedly connected to the outer side of the annular ring, the number of anti-slip particles is several, and the several anti-slip particles are evenly distributed on the outer side of the annular ring; a base plate is fixedly connected to both sides of the plug box, a buffer spring is fixedly connected to one side of the base plate, and one side of the buffer spring is in contact with the extension plate.

[0007] As an optional embodiment of the large-displacement proportional flow valve of the present invention, the fixing mechanism includes a fixing box. Motors are fixedly connected to both ends of one side of the inner wall of the fixing box. A first gear is fixedly connected to the output end of the motor. A second gear is meshed with one side of the first gear. One side of the second gear is slidably connected to the inner wall of the fixing box. A connecting screw is fixedly connected to the other side of the second gear. One end of the connecting screw is movably connected to the inner wall of the fixing box. A transmission plate is threaded to the outer side of the connecting screw. Connecting plates are fixedly connected to both ends of one side of the transmission plate. One end of the connecting plate passes through the fixing box and the protective cylinder and extends to the inner side of the protective cylinder, and is fixedly connected to a support plate. One side of the support plate is fixedly connected to a locking pin. A fixing disc is fixedly connected to the valve stem of the flow valve. One end of the locking pin passes through the interior of the fixing disc, and the locking pin cooperates with the fixing disc.

[0008] As an optional embodiment of the large displacement proportional flow valve of the present invention, wherein: the transmission plate has an opening groove inside that corresponds to the motor, and the opening groove is clearance-fitted with the motor.

[0009] As an optional embodiment of the large displacement proportional flow valve of the present invention, a fixing column is fixedly connected to one side of the inner wall of the fixing box, one end of the fixing column extends through to one side of the transmission plate and is fixedly connected to the inner wall of the fixing box, the fixing column and the transmission plate are in clearance fit, and the number of fixing columns is several, and the several fixing columns are evenly distributed in a ring.

[0010] As an optional embodiment of the large displacement proportional flow valve of the present invention, wherein: a fastening spring is sleeved on the outside of the fixed column, the number of the fastening springs is two, and the two fastening springs are symmetrically arranged on the outside of the fixed column, one end of the fastening spring is fixedly connected to the inner wall of the fixed box, and the other end of the fastening spring is fixedly connected to the transmission plate.

[0011] As an optional embodiment of the large displacement proportional flow valve of the present invention, wherein: a pressure plate is slidably connected to one side of the second gear, a connecting column is fixedly connected to one side of the pressure plate, and one end of the connecting column is fixedly connected to the inner wall of the fixed box.

[0012] As an optional embodiment of the large displacement proportional flow valve of the present invention, wherein: a support column is provided inside the clamping spring, one end of the support column is fixedly connected to the inner wall of the plug-in box, and the other end of the support column extends through to one side of the sliding plate and is fixedly connected to the inner wall of the plug-in box, and the support column and the sliding plate are in clearance fit.

[0013] As an optional solution for the large displacement proportional flow valve of the present invention, the outer side of the fixed plate is provided with a slot corresponding to the locking post, the slot and the locking post are fitted with a clearance, and there are several slots that are evenly distributed.

[0014] The present invention has the following beneficial effects:

[0015] 1. This large-displacement proportional flow valve, through the setting of a plug-in mechanism, can fix the height of the protective cylinder after the plug-in post is inserted into the plug-in slot on one side of the regulating plate. Moreover, the multiple plug-in slots ensure that the protective cylinder can be fixed at different heights. After forming a sealed space with the sealing cover, it is convenient to use the protective cylinder to shield and protect the connection between the flow valve and the proportional regulating device, preventing the valve stem of the flow valve from being exposed and corroded or accumulating dust.

[0016] 2. This large-capacity proportional flow valve, through the setting of a fixing mechanism, after the motor starts, drives the locking pin into the locking groove on the outside of the fixing plate, thereby positioning the valve stem of the flow valve and locking the valve stem to prevent the valve stem from sliding and causing the flow rate of the flow valve to change.

[0017] 3. This large-displacement proportional flow valve, through the setting of an extension plate, annular ring, anti-slip particles, base plate and buffer spring, increases the usable area of ​​the handle, making it easier to use and improving the convenience of using the handle. The anti-slip particles make the handle non-slip, preventing the hand from slipping during use. The base plate fixes the buffer spring to both sides of the plug box, and the elasticity of the buffer spring provides an anti-collision effect to the extension plate. The elasticity of the buffer spring is less than that of the clamping spring, preventing the buffer spring from popping out the plug post connected to the handle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the protective cylinder of the present invention.

[0020] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0021] Figure 4 This is a cross-sectional structural diagram of the plug-in box of the present invention.

[0022] Figure 5 This is a cross-sectional structural diagram of the fixing box of the present invention.

[0023] In the diagram: 1. Flow valve; 2. Proportional adjustment device; 3. Adjusting plate; 4. Protective cylinder; 5. Sealing cover; 601. Plug-in box; 602. Handle; 603. Plug-in post; 604. Sliding plate; 605. Clamping spring; 606. Plug-in groove; 7. Clamping post; 8. Extension plate; 9. Annular ring; 10. Anti-slip particles; 11. Base plate; 12. Buffer spring; 1301. Fixing box; 1302. Motor; 1303. First gear; 1304. Second gear; 1305. Connecting screw; 1306. Transmission plate; 1307. Connecting plate; 1308. Support plate; 1309. Fixing disc; 14. Opening groove; 15. Fixing post; 16. Fastening spring; 17. Pressure plate; 18. Connecting post; 19. Support post; 20. Clamping groove. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] Please see Figures 1 to 5 It includes a flow valve 1 and a proportional regulating device 2. The proportional regulating device 2 is fixedly connected to the valve stem of the flow valve 1. Adjusting plates 3 are fixedly connected to both sides of the proportional regulating device 2. A protective cylinder 4 is sleeved on the outside of the proportional regulating device 2. A sealing cover 5 is fixedly connected to the inside of the protective cylinder 4. The sealing cover 5 is slidably connected to the proportional regulating device 2 and the adjusting plates 3. A plug-in mechanism is fixedly connected to the top of the outside of the protective cylinder 4. A locking post 7 is provided on both sides inside the protective cylinder 4. A fixing mechanism is fixedly connected to both sides of the protective cylinder 4.

[0027] Please see Figure 2 and Figure 4The insertion mechanism includes an insertion box 601. A handle 602 is provided on one side of the insertion box 601. An insertion post 603 is fixedly connected to one side of the handle 602. One end of the insertion post 603 passes through the insertion box 601, the protective cylinder 4, and the adjusting plate 3 and extends into the interior of the adjusting plate 3. A sliding plate 604 is fixedly connected to the outside of the insertion post 603. Both ends of one side of the sliding plate 604 are fixedly connected to clamping springs 605. One end of the clamping springs 605 is fixedly connected to the inner wall of the insertion box 601. An insertion groove 606 corresponding to the insertion post 603 is provided on one side of the adjusting plate 3. There are several insertion grooves 606, and the grooves 606 are equidistantly distributed. The grooves 606 and the insertion post 603 are in clearance fit.

[0028] By setting up a plug-in mechanism, the plug-in post 603 can be inserted into the plug-in slot 606 on one side of the regulating plate 3 to fix the height of the protective cylinder 4. The multiple plug-in slots 606 ensure that the protective cylinder 4 can be fixed at different heights. After forming a sealed space with the sealing cover 5, it is convenient to use the protective cylinder 4 to shield and protect the connection between the flow valve 1 and the proportional regulating device 2, and prevent the valve stem of the flow valve 1 from being exposed and corroded or accumulating dust.

[0029] Please see Figure 4 Both sides of the handle 602 are fixedly connected to extension plates 8. Both the top and bottom of the extension plates 8 are fixedly connected to rings 9. Anti-slip particles 10 are fixedly connected to the outer side of the rings 9. There are several anti-slip particles 10, and the several anti-slip particles 10 are evenly distributed on the outer side of the rings 9. Both sides of the plug box 601 are fixedly connected to base plates 11. A buffer spring 12 is fixedly connected to one side of the base plate 11. One side of the buffer spring 12 is in contact with the extension plates 8.

[0030] By setting up an extension plate 8, annular ring 9, anti-slip particles 10, base plate 11, and buffer spring 12, the extension plate 8 and annular ring 9 increase the usable area of ​​the handle 602, making it easier to leverage when using the handle 602 and improving the convenience of using the handle 602. The anti-slip particles 10 make the handle 602 anti-slip, making it less likely to slip during use. The base plate 11 fixes the buffer spring 12 to both sides of the plug box 601, and the elasticity of the buffer spring 12 provides an anti-collision effect against the extension plate 8. The elasticity of the buffer spring 12 is less than that of the clamping spring 602, preventing the buffer spring 12 from popping out the plug post 603 connected to the handle 602.

[0031] Please see Figure 4 The clamping spring 605 has a support column 19 inside. One end of the support column 19 is fixedly connected to the inner wall of the plug box 601, and the other end of the support column 19 passes through to one side of the sliding plate 604 and is fixedly connected to the inner wall of the plug box 601. The support column 19 and the sliding plate 604 are fitted with a clearance.

[0032] By setting the support column 19, the support column 19 plays a limiting role inside the sliding plate 604, making the sliding plate 604 move more smoothly.

[0033] The working principle of this embodiment is as follows: When the protective cylinder 4 falls and contacts the top of the flow valve 1, the protective cylinder 4 and the sealing cover 5 form a sealed space, which facilitates the shielding and protection of the connection between the flow valve 1 and the proportional adjustment device 2, thereby preventing the valve stem of the flow valve 1 from being exposed and rusting or accumulating dust. When the plug 603 is inserted into the plug groove 606 on one side of the adjustment plate 3, the height of the protective cylinder 4 can be fixed. Several plug grooves 606 ensure that the protective cylinder 4 can be fixed at different heights. After the protective cylinder 4 moves upward, the connection between the flow valve 1 and the proportional adjustment device 2 is exposed, which facilitates the subsequent maintenance of the flow valve 1.

[0034] Example 2

[0035] This embodiment is an improvement upon embodiment 1. For details, please refer to [link / reference]. Figures 1 to 5 The fixing mechanism includes a fixing box 1301. Motors 1302 are fixedly connected to both ends of one side of the inner wall of the fixing box 1301. A first gear 1303 is fixedly connected to the output end of the motor 1302. A second gear 1304 is meshed with one side of the first gear 1303. One side of the second gear 1304 is slidably connected to the inner wall of the fixing box 1301. A connecting screw 1305 is fixedly connected to the other side of the second gear 1304. One end of the connecting screw 1305 is movably connected to the inner wall of the fixing box 1301. A transmission plate 1306 is threadedly connected to the outer side of the rod 1305. Both ends of one side of the transmission plate 1306 are fixedly connected to a connecting plate 1307. One end of the connecting plate 1307 passes through the fixed box 1301 and the protective cylinder 4 and extends to the inner side of the protective cylinder 4. A support plate 1308 is fixedly connected to it. One side of the support plate 1308 is fixedly connected to the locking pin 7. A fixed plate 1309 is fixedly connected to the valve stem of the flow valve 1. One end of the locking pin 7 passes through the interior of the fixed plate 1309. The locking pin 7 and the fixed plate 1309 are used in conjunction.

[0036] By setting a fixing mechanism, after the motor 1302 starts, it drives the locking pin 7 into the locking groove 20 on the outside of the fixing plate 1309, thereby positioning the valve stem of the flow valve 1 and locking the valve stem to prevent the valve stem from sliding and causing the flow rate of the flow valve 1 to change.

[0037] Please see Figure 5 The transmission plate 1306 has an opening slot 14 inside that corresponds to the motor 1302, and the opening slot 14 is clearance-fitted with the motor 1302.

[0038] By setting the opening slot 14, the opening slot 14 inside the transmission plate 1306 provides space for the motor 1302, so that the transmission plate 1306 will not collide with the motor 1302 and be damaged when it moves, thus protecting the motor 1302.

[0039] Please see Figure 5 A fixing post 15 is fixedly connected to one side of the inner wall of the fixing box 1301. One end of the fixing post 15 passes through to one side of the transmission plate 1306 and is fixedly connected to the inner wall of the fixing box 1301. The fixing post 15 and the transmission plate 1306 are in clearance fit. There are several fixing posts 15, and the several fixing posts 15 are evenly distributed in a ring.

[0040] By setting fixed posts 15, several fixed posts 15 are arranged in a ring and are fitted with the transmission plate 1306 with a gap, so that the fixed posts 15 play a supporting and limiting role inside the transmission plate 1306 and play a guiding role when the transmission plate 1306 moves, preventing the transmission plate 1306 from shaking or shifting when it moves.

[0041] Please see Figure 5 Two fastening springs 16 are fitted on the outer side of the fixed column 15. The two fastening springs 16 are symmetrically arranged on the outer side of the fixed column 15. One end of the fastening spring 16 is fixedly connected to the inner wall of the fixed box 1301, and the other end of the fastening spring 16 is fixedly connected to the transmission plate 1306.

[0042] By setting a fastening spring 16, the fastening spring 16 applies a spring force to the transmission plate 1306, which pushes the transmission plate 1306 into close contact with the internally threaded connecting screw 1305 when the transmission plate 1306 moves, making the movement of the transmission plate 1306 more stable.

[0043] Please see Figure 5 A pressure plate 17 is slidably connected to one side of the second gear 1304, and a connecting column 18 is fixedly connected to one side of the pressure plate 17. One end of the connecting column 18 is fixedly connected to the inner wall of the fixed box 1301.

[0044] By setting up a pressure plate 17 and a connecting column 18, the connecting column 18 fixes the pressure plate 17 to one side of the inner wall of the fixed box 1301, while the pressure plate 17 presses the second gear 1304 against the inner wall of the fixed box 1301, thereby restricting the rotation of the second gear 1304 and making the second gear 1304 more stable and less prone to shaking when rotating.

[0045] Please see Figure 3 The outer side of the fixed plate 1309 is provided with a slot 20 corresponding to the locking post 7. The slot 20 and the locking post 7 are fitted with a clearance. There are several slots 20, and the slots 20 are evenly distributed on the fixed plate 1309.

[0046] By setting the slots 20, several slots 20 can be used in conjunction with the pins 7. After the pins 7 enter the slots 20, the fixed plate 1309 can be limited, thereby locking the valve stem of the flow valve 1 connected to the fixed plate 1309, preventing the valve stem from sliding back and causing the valve stem to rotate and change the flow rate of the flow valve 1.

[0047] The working principle of this embodiment is as follows: After the motor 1302 starts, it drives the first gear 1303 to rotate. The first gear 1303 drives the second gear 1304 to rotate. The second gear 1304 drives the connecting screw 1305 to rotate. The connecting screw 1305 drives the transmission plate 1306 to move to one side, so that the transmission plate 1306 drives the connecting plate 1307 to move to one side. The connecting plate 1307 drives the locking pin 7 to move closer to the fixed plate 1309 through the support plate 1308, so that the locking pin 7 enters the locking groove 20 on the outside of the fixed plate 1309, thereby positioning the valve stem of the flow valve 1 and locking the valve stem to prevent the valve stem from sliding and causing the flow rate of the flow valve 1 to change. When the motor 1302 reverses, it drives the locking pin 7 to move away from the fixed plate 1309, so that the locking pin 7 leaves the locking groove 20 on the outside of the fixed plate 1309. At this time, the proportional adjustment device 2 can be started normally to drive the valve stem of the flow valve 1 to rotate.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A large-displacement proportional flow valve, comprising a flow valve (1) and a proportional regulating device (2), wherein the proportional regulating device (2) is fixedly connected to the valve stem of the flow valve (1), characterized in that: The proportional adjustment device (2) is fixedly connected to two sides with adjustment plates (3), the outer side of the proportional adjustment device (2) is fitted with a protective cylinder (4), the inner side of the protective cylinder (4) is fixedly connected with a sealing cover (5), the sealing cover (5) is slidably connected to the proportional adjustment device (2) and the adjustment plate (3), the top of the outer side of the protective cylinder (4) is fixedly connected with a plug-in mechanism, the inner sides of the protective cylinder (4) are provided with locking posts (7), and the two sides of the protective cylinder (4) are fixedly connected with a fixing mechanism. The plug-in mechanism includes a plug-in box (601), a handle (602) is provided on one side of the plug-in box (601), a plug-in post (603) is fixedly connected to one side of the handle (602), one end of the plug-in post (603) passes through the plug-in box (601), the protective cylinder (4) and the adjusting plate (3) and extends into the interior of the adjusting plate (3), a sliding plate (604) is fixedly connected to the outside of the plug-in post (603), and a clamping spring (605) is fixedly connected to both ends of one side of the sliding plate (604), one end of the clamping spring (605) is fixedly connected to the inner wall of the plug-in box (601), and a plug-in groove (606) corresponding to the plug-in post (603) is opened on one side of the adjusting plate (3). There are several plug-in grooves (606), and the several plug-in grooves (606) are equidistantly distributed. The plug-in groove (606) and the plug-in post (603) are in clearance fit. The fixing mechanism includes a fixing box (1301). Motors (1302) are fixedly connected to both ends of one side of the inner wall of the fixing box (1301). A first gear (1303) is fixedly connected to the output end of the motor (1302). A second gear (1304) is meshed with one side of the first gear (1303). One side of the second gear (1304) is slidably connected to the inner wall of the fixing box (1301). A connecting screw (1305) is fixedly connected to the other side of the second gear (1304). One end of the connecting screw (1305) is movably connected to the inner wall of the fixing box (1301). A transmission plate (1306) is threadedly connected to the outside of the transmission plate (1305). Both ends of one side of the transmission plate (1306) are fixedly connected to a connecting plate (1307). One end of the connecting plate (1307) passes through the fixed box (1301) and the protective cylinder (4) and extends to the inside of the protective cylinder (4). A support plate (1308) is fixedly connected to it. One side of the support plate (1308) is fixedly connected to the locking pin (7). A fixed plate (1309) is fixedly connected to the valve stem of the flow valve (1). One end of the locking pin (7) passes through the inside of the fixed plate (1309). The locking pin (7) and the fixed plate (1309) are used together. The outer side of the fixed plate (1309) is provided with a slot (20) corresponding to the locking post (7), and the slot (20) and the locking post (7) are fitted with a clearance.

2. The large-displacement proportional flow valve according to claim 1, characterized in that: Both sides of the handle (602) are fixedly connected to extension plates (8), and both the top and bottom of the extension plates (8) are fixedly connected to annular rings (9). Anti-slip particles (10) are fixedly connected to the outer side of the annular rings (9). There are several anti-slip particles (10), and the several anti-slip particles (10) are evenly distributed on the outer side of the annular rings (9). Both sides of the plug box (601) are fixedly connected to base plates (11). A buffer spring (12) is fixedly connected to one side of the base plate (11), and one side of the buffer spring (12) is in contact with the extension plate (8).

3. The large-displacement proportional flow valve according to claim 1, characterized in that: The transmission plate (1306) has an opening slot (14) inside that corresponds to the motor (1302), and the opening slot (14) is in clearance fit with the motor (1302).

4. The large displacement proportional flow valve according to claim 1, characterized in that: A fixing column (15) is fixedly connected to one side of the inner wall of the fixing box (1301). One end of the fixing column (15) extends through to one side of the transmission plate (1306) and is fixedly connected to the inner wall of the fixing box (1301). The fixing column (15) is clearance-fitted with the transmission plate (1306). There are several fixing columns (15), and the several fixing columns (15) are evenly distributed in a ring.

5. The large displacement proportional flow valve according to claim 4, characterized in that: Two fastening springs (16) are provided on the outer side of the fixed column (15), and the two fastening springs (16) are symmetrically arranged on the outer side of the fixed column (15). One end of the fastening spring (16) is fixedly connected to the inner wall of the fixed box (1301), and the other end of the fastening spring (16) is fixedly connected to the transmission plate (1306).

6. The large displacement proportional flow valve according to claim 1, characterized in that: A pressure plate (17) is slidably connected to one side of the second gear (1304), and a connecting column (18) is fixedly connected to one side of the pressure plate (17). One end of the connecting column (18) is fixedly connected to the inner wall of the fixed box (1301).

7. The large displacement proportional flow valve according to claim 1, characterized in that: The clamping spring (605) has a support column (19) inside. One end of the support column (19) is fixedly connected to the inner wall of the plug box (601), and the other end of the support column (19) passes through to one side of the sliding plate (604) and is fixedly connected to the inner wall of the plug box (601). The support column (19) and the sliding plate (604) are in clearance fit.

8. The large displacement proportional flow valve according to claim 1, characterized in that: The number of slots (20) is several, and they are evenly distributed.

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