A manual rotary control valve

Abstract

The present invention discloses a manual rotary control valve, which relates to the field of hydraulic control, and comprises: a valve body, wherein the top surface of the valve body is provided with a mounting groove, the side surface of the valve body is provided with an A port, a B port, a P port and a T port, and two spring assemblies are installed inside the valve body; a valve sleeve, wherein the valve sleeve is provided with a vertical through hole and four flow channels; a valve stem, wherein the middle part of the valve stem is provided with a valve core part, the upper end of the valve stem is provided with a handle, the lower end of the valve stem is provided with a radial through hole, an adjusting rod is installed in the radial through hole, and one end of the adjusting rod extends between the two spring assemblies. In the present invention, when the handle is rotated to the left by a certain angle, the P port is connected with the A port and a pressure signal is output, at which time the B port is connected with the T port to return oil, the hydraulic oil enters the oil cylinder and pushes the oil cylinder to start to move right, and then the opening area of ​​the valve sleeve is reduced, and the pressure after decompression is just equal to the spring force on the right side of the oil cylinder, at which time the oil cylinder no longer continues to move, so it can be applied to the movement of the oil cylinder with precise control.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic control, and more particularly to a manual rotary control valve. Background Art

[0002] Hydraulic control systems are generally divided into pump control systems and valve control systems. Pump control systems are widely used in closed circuits due to their simple structure, high integration, and low pressure loss. Control valves are essential core components in this control system. Their control accuracy and sensitivity will directly affect the operation of the entire system and the performance of variable pumps. However, current control valves have the following problems:

[0003] 1. When in use, problems such as low control accuracy, insensitive response, and low efficiency may occur, affecting the normal operation of the entire system;

[0004] 2. During assembly, since the valve body is relatively high as a whole and a through groove is provided on the top surface, the through groove is used to install the valve stem and the valve sleeve. However, the existing valve stem or valve sleeve needs to be provided with sealing rings at both ends during assembly, which is inconvenient to install into the through groove and the assembly efficiency is low. Summary of the invention

[0005] The object of the present invention is to provide a manual rotary control valve in order to solve the above-mentioned problems.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a manual rotary control valve, comprising: a valve body, the top surface of the valve body is provided with a mounting groove, the side surface of the valve body is provided with an A port, a B port, a P port and a T port connected to the mounting groove, two symmetrically arranged spring assemblies are installed inside the valve body, the bottom surface and the top surface of the valve body are located at the position of the mounting groove and are respectively fixedly connected with a bottom plate and a limit sleeve by screws; a valve sleeve is installed in the mounting groove, and the valve sleeve is provided with a vertical through hole, four flow channels connected to the vertical through hole, and a semicircular through hole located below the flow channel. A groove and a mounting hole connected to the semicircular groove, wherein three flow channels are respectively connected to port A, port B and port P, and another flow channel is connected to port T through a vertical groove, and a ball joint passing through port T and connected to the oil cylinder is installed in the mounting hole; a valve stem is rotatably connected in the vertical through hole, a valve core part for opening and closing the flow channel is arranged in the middle of the valve stem, and V-shaped grooves are arranged on both planes of the valve core part, the upper end of the valve stem passes through the valve body and is installed with a handle, and the lower end of the valve stem is provided with a radial through hole, an adjusting rod is installed in the radial through hole, and one end of the adjusting rod extends between the two spring assemblies.

[0007] When the handle is turned to the left by a certain angle, port P is connected to port A and a pressure signal is output. At this time, port B is connected to port T to return oil, and the hydraulic oil enters the cylinder and pushes the cylinder to start moving right, causing the pump displacement and oil direction to change. Since the cylinder and the valve sleeve are connected by a ball dumpling, the valve sleeve rotates with the displacement of the cylinder. When the angle reaches a certain angle, the opening area of ​​the valve sleeve is reduced, and the pressure after decompression is just equal to the spring force on the right side of the cylinder. At this time, the cylinder no longer continues to move, so it can be used for precisely controlled cylinder movement. The displacement of the cylinder is proportional to the rotation angle of the handle.

[0008] Preferably, an upper valve seat is arranged between the top surface of the valve sleeve and the bottom surface of the limit sleeve, and a lower valve seat is arranged between the bottom surface of the valve sleeve and the top surface of the base plate. The upper valve seat is sleeved on the valve stem and is installed with a plurality of first sealing rings for sealing with the valve stem, and the outer side surfaces of the upper valve seat and the lower valve seat are installed with second sealing rings for sealing with the valve body.

[0009] By setting the upper valve seat and the lower valve seat, the two valve seats are actually separated from the valve sleeve, that is, the original one-piece structure is separated into the existing three parts, and the one-piece structure is changed to a separate structure, which is convenient for the three parts to be simply manufactured separately, with a higher yield rate, and is convenient for assembly. The original second sealing ring below needs to be inserted from the top surface of the valve body and continuously moved along the bottom surface of the valve body along the mounting groove, but is changed to the upper valve seat entering from the top of the mounting groove and the lower valve seat entering from the bottom of the mounting groove. At the same time, the valve stem only needs to be sealed and rotated with the upper valve seat, which makes the overall assembly more convenient and improves assembly efficiency.

[0010] Preferably, the spring assembly comprises a sleeve slidably connected to the valve body and a screw plug threadedly connected to the valve body, and a spring is installed between the sleeve and the screw plug.

[0011] By arranging a spring assembly and designing its structure, when the valve stem rotates, an angle is formed between the valve core and the screw plug, and the spring can drive the valve core to reset.

[0012] Preferably, a plunger is inserted into the valve body, one end of the plunger is provided with a butt joint for abutting against two sleeves, the plunger is provided with a positioning ring groove and a third sealing ring sealingly matched with the inner wall of the valve body, and a positioning screw is threadedly connected on the valve body, the tip of which is inserted into the positioning ring groove to limit the axial movement of the plunger, and the central axis of the plunger is perpendicular to the central axis of the sleeve.

[0013] By setting a plunger and using the tip of a side-mounted positioning screw to snap into the positioning ring groove, the plunger can be limited in axial direction. Combined with the sealing effect of the first sealing ring, the relative sealing effect between the plunger and the valve body can be ensured while simplifying the assembly structure and assembly process, thereby improving the assembly effect.

[0014] Preferably, one end of the adjusting rod is fixedly connected to a sphere located between the two sleeves, and the sphere is clearance-matched with the sleeves.

[0015] By setting the ball, when the adjusting rod rotates with the valve stem, it can drive the ball to squeeze the sleeve, and then compress the corresponding spring, so as to achieve point contact extrusion between the ball and the sleeve. It is more stable when both rotation and extrusion are carried out at the same time, and the assembly and connection are more convenient. The clearance between the ball and the sleeve can prevent the ball from interfering with the normal position of the sleeve.

[0016] Preferably, a limit assembly for limiting the rotation angle of the valve stem is provided between the handle and the valve sleeve.

[0017] By setting a limit assembly, the rotation angle of the handle can be limited, that is, the rotation angle of the valve stem can be limited to avoid adverse effects such as backflow of various oil ports due to excessive rotation of the handle, thereby ensuring the rationality of its rotation angle.

[0018] Preferably, the limit assembly includes a limit groove arranged on the bottom surface of the limit sleeve, and a limit block is fixedly installed on the valve stem for contacting the side wall of the limit groove to limit the rotation angle of the valve stem. The limit sleeve and the valve body are both provided with two positioning holes distributed in a circular array, and positioning pins are inserted in the corresponding positioning holes.

[0019] By setting a limit groove and a limit block that cooperate with each other, since the length and width of the limit block are both smaller than the width of the limit groove and the central axes of the two are located on the same straight line, the limit block will abut against the side wall of the limit groove during rotation, thereby limiting the rotation angle of the valve stem. At the same time, two corresponding groups of positioning holes are set, so that the relative position between the limit sleeve and the valve body can be aligned first during assembly to ensure the subsequent connection and fixation of screws, etc.

[0020] Preferably, one end of the handle is provided with a slot along its length direction, the top surface of the handle is provided with a polygonal slot for inserting the upper end of the valve stem, and the side surface of the handle is provided with an adjusting screw for fastening the valve stem.

[0021] By setting the slots and polygonal slots, since the upper end of the valve stem is also a polygonal structure, the upper end of the valve stem can be plugged into and matched with the polygonal slot, and the width of the slot can be reduced by using an adjusting screw, thereby driving the handle to be tightly fixed on the valve stem, making assembly more convenient and reliable.

[0022] Preferably, a retaining spring clamped on the valve stem is provided between the handle and the limiting sleeve.

[0023] By providing a retaining spring, the handle and the limiting sleeve can be separated, and the contact area between the retaining spring and the handle is significantly smaller, thereby reducing the friction resistance of the handle and making the rotation of the handle more convenient and accurate.

[0024] Preferably, a threaded hole communicating with the radial through hole is provided on the bottom surface of the valve stem, and a fixing bolt for tightening the adjusting rod is threadedly connected to the inner thread of the threaded hole.

[0025] By setting a threaded hole on the bottom surface of the valve stem and tightening the adjusting rod with a fixing bolt, the valve stem and the adjusting rod are relatively fixed, so that the valve stem can drive the adjusting rod to move synchronously during rotation and generate a force on one of the spring assemblies. Since the fixing bolt enters directly from the installation groove and is screwed into the valve stem, assembly is simpler and more convenient, and there will be no mutual interference with other components.

[0026] In summary, the present invention has the following beneficial effects:

[0027] 1. When the handle is turned to the left at a certain angle, the P port is connected to the A port and a pressure signal is output. At this time, the B port is connected to the T port to return the oil. The hydraulic oil enters the cylinder and pushes the cylinder to start moving right, causing the pump displacement and oil direction to change. Since the cylinder and the valve sleeve are connected by a ball dumpling, the valve sleeve rotates with the displacement of the cylinder. When the angle reaches a certain angle, the opening area of ​​the valve sleeve is reduced, and the pressure after decompression is just equal to the spring force on the right side of the cylinder. At this time, the cylinder no longer continues to move, so it can be used for precisely controlled cylinder movement. The displacement of the cylinder is proportional to the rotation angle of the handle.

[0028] 2. The overall structure is divided into an upper valve seat, a lower valve seat, a valve sleeve and a valve stem, and there is only one sealing ring between the upper valve seat, the lower valve seat and the valve body, and the valve stem is also only provided with a sealing ring with the upper valve seat, which makes the overall assembly more convenient and improves the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 It is a front structural schematic diagram of the present invention;

[0031] Figure 3 For the present invention Figure 2 AA section view in;

[0032] Figure 4 For the present invention Figure 2 BB section view in;

[0033] Figure 5 For the present invention Figure 2 CC section view in;

[0034] Figure 6 It is a structural schematic diagram of the valve sleeve in the present invention;

[0035] Figure 7It is a structural schematic diagram of the valve stem in the present invention;

[0036] Figure 8 It is a schematic structural diagram of the limiting sleeve in the present invention.

[0037] 1. Valve body; 11. A port; 12. B port; 13. T port; 14. P port; 15. Limit sleeve; 151. Limit groove; 152. Positioning hole; 16. Bottom plate; 2. Valve stem; 21. Valve core; 211. V-shaped groove; 22. Radial through hole; 23. Threaded hole; 24. Limit block; 25. Fixing bolt; 3. Handle; 31. Slot; 32. Adjusting screw; 33. Retaining spring; 4. Valve sleeve; 41. Vertical through hole; 42. Flow channel; 43. Semicircular groove; 44. Vertical groove; 45. Mounting hole; 51. Screw plug; 52. Spring; 53. Sleeve; 54. Plunger; 55. Positioning screw; 6. Ball joint; 7. Adjusting rod; 71. Ball; 8. Lower valve seat; 9. Upper valve seat. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figure 1-Figure 7 As shown, a manual rotary control valve comprises a valve body 1, the top surface of the valve body 1 is provided with a mounting groove, the side of the valve body 1 is provided with an A port 11, a B port 12, a P port 14 and a T port 13 connected to the mounting groove, a valve sleeve 4 is installed in the mounting groove, the valve sleeve 4 is provided with a vertical through hole 41, four flow channels 42 connected to the vertical through hole 41, a semicircular groove 43 located below the flow channel 42 and a mounting hole 45 connected to the semicircular groove 43, wherein three flow channels 42 are respectively connected to the A port 11, the B port 12 and the P port 14, another flow channel 42 is connected to the T port 13 through the vertical groove 44, and the mounting hole 45 is connected to the semicircular groove 43. A ball joint 6 is installed inside, which passes through the T-port 13 and is used to connect to the oil cylinder. A valve stem 2 is rotatably connected in the vertical through hole 41. A valve core part 21 for opening and closing the flow channel 42 is provided in the middle of the valve stem 2. V-shaped grooves 211 are provided on both planes of the valve core part 21. The upper end of the valve stem 2 passes through the valve body 1 and is installed with a handle 3. A radial through hole 22 is provided at the lower end of the valve stem 2. An adjusting rod 7 is installed in the radial through hole 22. One end of the adjusting rod 7 is fixedly connected to a ball 71. A threaded hole 23 connected to the radial through hole 22 is provided on the bottom surface of the valve stem 2. A fixing bolt 25 for tightening the adjusting rod 7 is threadedly connected in the threaded hole 23.

[0040] Further, such as Figure 2 , Figure 5 and Figure 8 As shown, the top surface of the valve body 1 is located at the position of the installation groove and is fixedly connected to the limiting sleeve 15 by screws, an upper valve seat 9 is arranged between the top surface of the valve sleeve 4 and the bottom surface of the limiting sleeve 15, the upper valve seat 9 is sleeved on the valve stem 2 and is installed with a plurality of first sealing rings for sealing with the valve stem 2, the bottom surface of the valve body 1 is located at the position of the installation groove and is fixedly connected to the bottom plate 16 by screws, a lower valve seat 8 is arranged between the bottom surface of the valve sleeve 4 and the top surface of the bottom plate 16, and the outer sides of the upper valve seat 9 and the lower valve seat 8 are installed with second sealing rings for sealing with the valve body 1. The adoption of a separate structure allows structures such as the upper valve seat 9, the lower valve seat 8 and the valve sleeve 4 to be manufactured separately, which makes the manufacturing simpler, more convenient and has a higher yield rate. In addition, during assembly, the upper valve seat 9 and the valve stem 2 are first assembled to form a sealing rotating structure, which can then enter from the top of the mounting groove to achieve the seal between the upper valve seat 9 and the valve body 1, while the lower valve seat 8 enters from the bottom of the mounting groove to achieve the seal between the lower valve seat 8 and the valve body 1 and to resist the valve stem 2. This ensures the sealing effect while making the overall assembly more convenient and improving the assembly efficiency.

[0041] Further, such as Figure 3 and Figure 7 As shown, two symmetrically arranged spring assemblies are installed inside the valve body 1, and the spring assembly includes a sleeve 53 slidably connected to the valve body 1 and a screw plug 51 threadedly connected to the valve body 1. A spring 52 is installed between the sleeve 53 and the screw plug 51, and the spring 52 can drive the valve core 21 to reset. The ball 71 on the adjusting rod 7 extends between the two sleeves 53, and the ball 71 and the sleeve 53 are clearance-matched. When the valve stem 2 rotates, it will drive the adjusting rod 7 to rotate, so that the valve core 21 will form an angle with the screw plug 51, which can drive the ball 71 to squeeze the sleeve 53, and then compress the corresponding spring 52, so as to realize point contact extrusion between the ball 71 and the sleeve 53. When the rotation and extrusion are carried out at the same time, it is more stable, and the assembly and connection are more convenient. In addition, due to the clearance fit between the ball 71 and the sleeve 53, it can avoid that the ball 71 interferes with the normal position of the sleeve 53.

[0042] Further, such as Figure 3 As shown, a plunger 54 is inserted into the valve body 1, and one end of the plunger 54 is provided with a butt joint for resisting the two sleeves 53. The plunger 54 is provided with a positioning ring groove and a third sealing ring that seals with the inner wall of the valve body 1. The valve body 1 is threadedly connected with a positioning screw 55 whose tip is inserted into the positioning ring groove to limit the axial movement of the plunger 54. The central axis of the plunger 54 is perpendicular to the central axis of the sleeve 53. The tip of the positioning screw 55 installed on the side is inserted into the positioning ring groove to limit the axial position of the plunger 54. In combination with the sealing effect of the first sealing ring, the relative sealing effect between the plunger 54 and the valve body 1 can be guaranteed, while the assembly structure and assembly process can be simplified, thereby improving the assembly effect.

[0043] Further, such as Figure 1 and Figure 8 As shown, a limit assembly for limiting the rotation angle of the valve stem 2 is arranged between the handle 3 and the valve sleeve 4, and the limit assembly includes a limit groove 151 arranged on the bottom surface of the limit sleeve 15, and a limit block 24 is fixedly installed on the valve stem 2 for contacting the side wall of the limit groove 151 to limit the rotation angle of the valve stem 2. The length and width of the limit block 24 are both smaller than the groove width of the limit groove 151 and the central axes of the two are located on the same straight line, so that the limit block 24 will abut against the side wall of the limit groove 151 during the rotation process, thereby realizing the limitation of the rotation angle of the valve stem 2, and the limit sleeve 15 and the valve body 1 are both provided with two circumferentially arrayed positioning holes 152, and the corresponding positioning holes 152 are inserted with positioning pins, that is, two groups of positioning holes 152, which can align the relative position between the limit sleeve 15 and the valve body 1 during assembly to ensure the connection and fixation of subsequent screws.

[0044] Further, such as Figure 1 As shown, one end of the handle 3 is provided with a slot 31 along its length direction, the top surface of the handle 3 is provided with a polygonal slot for inserting the upper end of the valve stem 2, and the side of the handle 3 is provided with an adjusting screw 32 for fastening the valve stem 2, and a retaining spring 33 clamped on the valve stem 2 is provided between the handle 3 and the limiting sleeve 15, the retaining spring 33 can separate the handle 3 and the limiting sleeve 15, and the contact area between the retaining spring 33 and the handle 3 is significantly smaller, thereby reducing the friction resistance of the handle 3, making the rotation of the handle 3 more convenient and accurate.

[0045] Working principle: When the handle 3 is rotated to the left by a certain angle, the P port 14 is connected with the A port 11 and a pressure signal is output. At this time, the B port 12 is connected with the T port 13 to return the oil, and the hydraulic oil enters the cylinder and pushes the cylinder to start moving right, so that the displacement of the pump and the direction of the oil change. Since the cylinder and the valve sleeve 4 are connected by a ball dumpling, the valve sleeve 4 rotates with the displacement of the cylinder. When the angle reaches a certain angle, the opening area of ​​the valve sleeve 4 is reduced, and the pressure after decompression is just equal to the spring force on the right side of the cylinder. At this time, the cylinder no longer continues to move, so it can be used for precisely controlled cylinder movement. The displacement of the cylinder is proportional to the rotation angle of the handle 3.

[0046] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A manual rotary control valve, characterized in that: include: A valve body (1), wherein the top surface of the valve body (1) is provided with a mounting groove, and the side surface of the valve body (1) is provided with an A port (11), a B port (12), a P port (14) and a T port (13) which are connected to the mounting groove, and two symmetrically arranged spring assemblies are installed inside the valve body (1), and the bottom surface and the top surface of the valve body (1) are located at the position of the mounting groove and are respectively fixedly connected to a bottom plate (16) and a limit sleeve (15) by screws; A valve sleeve (4) is installed in the installation groove, and the valve sleeve (4) is provided with a vertical through hole (41), four flow channels (42) connected to the vertical through hole (41), a semicircular groove (43) located below the flow channel (42), and a mounting hole (45) connected to the semicircular groove (43), wherein three flow channels (42) are respectively connected to the A port (11), the B port (12), and the P port (14), and another flow channel (42) is connected to the T port (13) through the vertical groove (44), and a ball joint (6) passing through the T port (13) and used for connecting to the oil cylinder is installed in the mounting hole (45); A valve stem (2) is rotatably connected to the vertical through hole (41), a valve core portion (21) for opening and closing the flow channel (42) is provided in the middle of the valve stem (2), V-shaped grooves (211) are provided on both planes of the valve core portion (21), the upper end of the valve stem (2) passes through the valve body (1) and is provided with a handle (3), the lower end of the valve stem (2) is provided with a radial through hole (22), an adjusting rod (7) is installed in the radial through hole (22), and one end of the adjusting rod (7) extends between the two spring assemblies; An upper valve seat (9) is arranged between the top surface of the valve sleeve (4) and the bottom surface of the limiting sleeve (15), and a lower valve seat (8) is arranged between the bottom surface of the valve sleeve (4) and the top surface of the bottom plate (16). The upper valve seat (9) is sleeved on the valve stem (2) and is provided with a plurality of first sealing rings for sealing with the valve stem (2). Second sealing rings for sealing with the valve body (1) are provided on the outer side surfaces of the upper valve seat (9) and the lower valve seat (8). The spring assembly comprises a sleeve (53) slidably connected to the valve body (1) and a screw plug (51) threadedly connected to the valve body (1). A spring (52) is installed between the sleeve (53) and the screw plug (51); a plunger (54) is inserted into the valve body (1); one end of the plunger (54) is provided with a butt joint for abutting the two sleeves (53); the plunger (54) is provided with a positioning ring groove and a third sealing ring that is sealed with the inner wall of the valve body (1); a positioning screw (55) is threadedly connected to the valve body (1) for the tip to be inserted into the positioning ring groove to limit the axial movement of the plunger (54); the central axis of the plunger (54) is perpendicular to the central axis of the sleeve (53); A limit assembly for limiting the rotation angle of the valve stem (2) is arranged between the handle (3) and the valve sleeve (4), the limit assembly comprising a limit groove (151) arranged on the bottom surface of the limit sleeve (15), a limit block (24) for contacting the side wall of the limit groove (151) to limit the rotation angle of the valve stem (2) is fixedly mounted on the valve stem (2), and the limit sleeve (15) and the valve body (1) are both provided with two circumferentially arrayed positioning holes (152), and positioning pins are inserted into the corresponding positioning holes (152).

2. The manual rotary control valve according to claim 1, characterized in that: One end of the adjusting rod (7) is fixedly connected to a sphere (71) located between the two sleeves (53), and the sphere (71) and the sleeves (53) are clearance-matched.

3. The manual rotary control valve according to claim 1, characterized in that: One end of the handle (3) is provided with a slot (31) along its length direction, the top surface of the handle (3) is provided with a polygonal slot for inserting the upper end of the valve stem (2), and the side surface of the handle (3) is provided with an adjusting screw (32) for fastening the valve stem (2).

4. The manual rotary control valve according to claim 1, characterized in that: A retaining spring (33) clamped on the valve stem (2) is provided between the handle (3) and the limiting sleeve (15).

5. The manual rotary control valve according to claim 1, characterized in that: The bottom surface of the valve stem (2) is provided with a threaded hole (23) connected to the radial through hole (22), and the threaded hole (23) is internally threadedly connected with a fixing bolt (25) for tightening the adjusting rod (7).

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