Automatic exhaust structure of material pressing machine

Abstract

The utility model relates to an automatic exhaust structure of a material pressing machine, which comprises a valve seat, a valve core and a guide flat gasket, the valve core is composed of a connecting rod and a valve core block fixed at the bottom end of the connecting rod, the valve core block is composed of an upper small round block and a lower large round block, an annular mounting groove is arranged on the periphery of the upper small round block, an O-shaped sealing ring is arranged in the annular mounting groove, and the guide flat gasket is arranged in the O-shaped sealing ring. The valve seat is of a cylindrical structure with middle holes, the guide flat gasket is installed at the top end of the valve seat, the middle holes in the two sides of the guide flat gasket form exhaust ports, the top end of a connecting rod of the valve element penetrates through the guide flat gasket, the connecting rod is installed on the guide flat gasket through a positioning pin, and an air inlet is formed in the lower end in the valve seat and sequentially comprises a small equal-diameter hole, a conical hole and a large equal-diameter hole from top to bottom. According to the structure, the O-shaped sealing ring installed on the valve element and the valve seat are sealed in a taper fit mode, the sealing effect is good, the valve element is fast and reliable to open and close, the structure is simple, maintenance and repair are easy, the valve element is easy and convenient to disassemble and assemble, and materials are easy and fast to disassemble and clean.

Description

Technical Field

[0001] The utility model relates to an automatic exhaust structure, in particular to an automatic exhaust structure of a material pressing machine. Background Art

[0002] An automatic exhaust valve needs to be installed on the pressing plate of the pressing machine. The existing automatic exhaust valve has the problems of complex structure, poor sealing, serious leakage, etc.

[0003] Chinese utility model patent 202220281249.4 discloses a mechanical automatic exhaust device, including a valve seat, a valve body, an exhaust assembly and a sealing assembly. After the valve body is placed in the valve seat, its top is fixed by a fixing assembly. A spring is mounted on the valve body to drive the valve body to move up and down. The bottom of the valve body and the valve seat are sealed by a sealing assembly. The device has the following shortcomings: 1. The plane and the sealing ring are used for contact sealing, and it is not easy to open the valve body to inlet air; 2. A spring needs to be set to apply force to open the valve body to inlet air, which has a complex structure and the spring is easily damaged, increasing the workload of repair and maintenance; 3. The valve body is installed by bolts, and it takes time to twist the bolts during disassembly and assembly, which is not easy to disassemble and assemble. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide an automatic exhaust structure for a material press, in which an O-ring installed on a valve core and a valve seat adopt a taper-matching seal, and the sealing effect is good. The valve core can be opened and closed quickly and reliably, the structure is simple, and maintenance and repair are easy. The valve core is easy to disassemble and assemble, so that the disassembly and cleaning of materials is easy and quick.

[0005] The technical solution to solve the above technical problems is: an automatic exhaust structure of a feed press, comprising a valve seat, a valve core and a guide flat pad, the valve core is composed of a connecting rod and a valve core block fixed at the bottom end of the connecting rod, the valve core block is composed of an upper small round block and a lower large round block, the outer periphery of the upper small round block is provided with an annular mounting groove, an O-ring is installed in the annular mounting groove, the valve seat is a cylindrical structure with a central hole, the guide flat pad is installed at the top end of the valve seat, the central holes of the valve seat on both sides of the guide flat pad form an exhaust port, the top end of the connecting rod of the valve core passes through the guide flat pad, and the connecting rod is installed on the guide flat pad by a locating pin, the lower end of the valve seat is arranged as an air inlet hole, and the air inlet holes are small equal-diameter holes, conical holes and large equal-diameter holes from top to bottom, when closed, the upper part of the upper small round block of the valve core block is located in the small equal-diameter hole of the valve seat air inlet hole, and the O-ring is pressed against the conical hole; when open, there is a gap between the valve core block, the O-ring and the valve seat air inlet hole.

[0006] Furthermore, the connecting rod is composed of a connecting rod body and a top mounting rod, the diameter of the top mounting rod is smaller than the diameter of the connecting rod body, a gasket is mounted on the top mounting rod, and a positioning pin is inserted on the top mounting rod and located above the gasket.

[0007] Furthermore, the guide flat washer is mounted on the valve seat by bolts.

[0008] Furthermore, the diameter of the small equal-diameter hole of the valve seat is larger than the diameter of the middle hole, the diameter of the upper small round block of the valve core block is smaller than the diameter of the small equal-diameter hole of the valve seat and larger than the diameter of the middle hole. In the closed state, the top of the upper small round block of the valve core block presses against the top of the small equal-diameter hole of the valve seat, and the O-ring presses against the conical hole.

[0009] Furthermore, the diameter of the lower large round block of the valve core block and the diameter of the O-ring are both larger than the small end diameter of the tapered hole of the valve seat and smaller than the large end diameter of the tapered hole.

[0010] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0011] 1. The O-ring on the valve core and the valve seat adopt a taper seal, which has a good sealing effect and is easier to open. There is no need to set elastic components to apply force. The structure is simple and reliable, and maintenance and repair are convenient. Due to the use of conical surface sealing, the opening and closing of the valve core is fast and reliable, which can ensure the sensitivity of the device.

[0012] 2. The valve core is installed with a locating pin. When inserting and installing, you only need to pull out and insert the locating pin, which saves time and effort and makes disassembly and cleaning of materials easier and faster.

[0013] 3. When in the closed state, the top of the small round block on the valve core block presses against the top of the small equal-diameter hole of the valve seat air inlet hole, that is, the small equal-diameter hole on the valve seat is used to limit the valve core, thereby controlling the compression of the O-ring, so that the compression of the O-ring is controlled between 6-20% of the dynamic seal, ensuring its safety, reliability, efficiency and stability.

[0014] 4. The limit position of the utility model when closed is set above the O-ring, which can reduce the hardening of materials at the limit position and affect the sealing. The limit position has a small area and less material accumulation. The upper small round block of the valve core and the small equal-diameter hole of the valve seat are basically matched in shape and size. It is easier to self-clean materials during the switching process, thereby ensuring the reliability of the sealing.

[0015] The technical features of the automatic exhaust structure of a material press of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : Schematic diagram of the automatic exhaust structure of a press machine according to the utility model (open state).

[0017] Figure 2 : Top view of the guide flat pad and valve seat of the utility model.

[0018] Figure 3: Schematic diagram of the automatic exhaust structure of a press machine according to the utility model (closed state).

[0019] Figure 4 : The utility model is used in the state diagram.

[0020] In the figure: 1-valve seat, 11-middle hole, 12-small equal-diameter hole, 13-tapered hole, 14-large equal-diameter hole, 2-valve core, 21-connecting rod, 211-top mounting rod, 212-connecting rod body, 22-valve core block, 221-upper small round block, 222-lower large round block, 3-O-ring, 4-guide flat washer, 5-bolt, 6-locating pin, 7-gasket, 8-exhaust port.

[0021] P1-the utility model, P2-mixing barrel, P3-discharging port, P4-pressing plate, P5-pressing machine cylinder.

[0022] The arrow in the figure indicates the direction of air intake. DETAILED DESCRIPTION

[0023] Embodiment 1: An automatic exhaust structure of a press machine, such as Figure 1-Figure 3 As shown, it includes a valve seat 1, a valve core 2 and a guide flat pad 4. The valve core 2 is composed of a connecting rod 21 and a valve core block 22 fixed at the bottom end of the connecting rod. The valve core block 22 is composed of an upper small round block 221 and a lower large round block 222. The outer periphery of the upper small round block 221 is provided with an annular mounting groove, and an O-ring 3 is installed in the annular mounting groove. The valve seat 1 is a cylindrical structure with a central hole 11. The guide flat pad 4 is fixedly installed at the top of the valve seat 1. The valve seat central holes on both sides of the guide flat pad 4 form exhaust ports 8. The valve core 2 is located in the valve seat 1. The top of the connecting rod 21 of the valve core passes through the guide flat pad 4. The connecting rod 21 is installed on the guide flat pad 4 through a positioning pin 6. The positioning pin 6 is a split pin. The lower end of the valve seat 1 is set as an air inlet hole. The air inlet holes are small equal-diameter holes 12, tapered holes 13 and large equal-diameter holes 14 from top to bottom. The valve core can move up and down to realize the opening and closing of the entire structure. When in the closed state, the upper part of the upper small round block 221 of the valve core block 22 is located in the small equal-diameter hole 12 of the air inlet hole of the valve seat 1, and the O-ring 3 presses against the conical hole 13; when in the open state, there is a gap between the valve core block 22, the O-ring 3 and the air inlet hole of the valve seat 1, and the gas is discharged upward from the gap.

[0024] In this embodiment, the connecting rod 21 is composed of a connecting rod body 212 and a top mounting rod 211. The diameter of the top mounting rod 211 is smaller than the diameter of the connecting rod body 212. A gasket 7 is mounted on the top mounting rod 211. The gasket 7 is placed on the top of the connecting rod body 212. The gasket 7 moves synchronously with the connecting rod 21. The positioning pin 6 is inserted on the top mounting rod 211 and is located above the gasket 7. The gasket 7 is located between the positioning pin 6 and the guide flat pad 4, which can prevent the positioning pin 6 from getting stuck in the valve core 2 and affecting the normal operation of the valve core.

[0025] In this embodiment, the guide flat washer 4 is mounted on the valve seat 1 by means of bolts 5. As a modification, the guide flat washer 4 can also be mounted on the valve seat 1 by means of other suitable structures.

[0026] In this embodiment, the diameter of the small equal-diameter hole 12 of the valve seat 1 is larger than the diameter of the middle hole 11, and the diameter of the upper small round block 221 of the valve core block 22 is smaller than the diameter of the small equal-diameter hole 12 of the valve seat and larger than the diameter of the middle hole 11. In the closed state, the top of the upper small round block 221 of the valve core block presses against the top of the small equal-diameter hole 12 of the valve seat air inlet, and the O-ring 3 presses against the conical hole 13. The compression amount of the O-ring 3 is limited by the cooperation of the small round block 221 and the small equal-diameter hole 12. The limit position in the closed state is set above the O-ring to reduce the hardening of the material entering the limit position and affecting the sealing effect. The diameter of the lower large round block 222 of the valve core block 22 and the diameter of the O-ring 3 are both larger than the small end diameter of the conical hole 13 of the valve seat and smaller than the large end diameter of the conical hole.

[0027] Working process:

[0028] like Figure 4 As shown, the utility model is installed on the pressing plate of the pressing machine, and the hydraulic system of the pressing machine drives the pressing plate to descend. When the pressing plate and the mixing barrel form a seal, the valve core of the utility model is suspended on the guide flat pad under the action of gravity, and the valve core and the O-ring are not in contact with the valve seat. At this time, the utility model is in an open exhaust state (such as Figure 1 As shown); when the pressing plate descends and contacts the material, the material pushes the valve core upward until the O-ring contacts and seals the valve seat. At this time, the utility model is in a closed state without exhaust (as shown Figure 3 As shown), the mixing barrel is completely sealed. After the pressing is completed, the hydraulic system of the pressing machine drives the pressing plate to rise, and the utility model automatically opens the exhaust.

Claims

1. An automatic exhaust structure for a press, characterized in that: The invention comprises a valve seat (1), a valve core (2) and a guide flat washer (4), wherein the valve core is composed of a connecting rod (21) and a valve core block (22) fixed at the bottom end of the connecting rod, wherein the valve core block is composed of an upper small round block (221) and a lower large round block (222), wherein an annular mounting groove is formed on the outer periphery of the upper small round block, and an O-type sealing ring (3) is installed in the annular mounting groove, wherein the valve seat (1) is a cylindrical structure with a central hole (11), and the guide flat washer (4) is installed at the top end of the valve seat (1), and the valve seat on both sides of the guide flat washer is provided with a plurality of guide flat washer components. The middle hole forms an exhaust port (8), the top end of the connecting rod of the valve core passes through the guide flat pad, and the connecting rod is installed on the guide flat pad (4) through a positioning pin (6). The lower end of the valve seat is set as an air inlet hole, and the air inlet holes are small equal-diameter holes (12), tapered holes (13) and large equal-diameter holes (14) from top to bottom. In the closed state, the upper part of the upper small round block of the valve core block is located in the small equal-diameter hole of the valve seat air inlet hole, and the O-type sealing ring is pressed against the tapered hole; in the open state, there is a gap between the valve core block, the O-type sealing ring and the valve seat air inlet hole.

2. The automatic exhaust structure of a material press according to claim 1 is characterized in that: The connecting rod (21) is composed of a connecting rod body (212) and a top mounting rod (211); the diameter of the top mounting rod is smaller than the diameter of the connecting rod body; a gasket (7) is sleeved on the top mounting rod; and a positioning pin (6) is inserted into the top mounting rod and is located above the gasket.

3. The automatic exhaust structure of a feed press according to claim 1 or 2, characterized in that: The guide flat washer (4) is mounted on the valve seat (1) via bolts (5).

4. The automatic exhaust structure of a feed press according to claim 1 or 2, characterized in that: The diameter of the small equal-diameter hole (12) of the valve seat is larger than the diameter of the middle hole (11); the diameter of the upper small round block (221) of the valve core block is smaller than the diameter of the small equal-diameter hole (12) of the valve seat and larger than the diameter of the middle hole (11); in a closed state, the top end of the upper small round block (221) of the valve core block presses against the top end of the small equal-diameter hole (12) of the valve seat, and the O-ring (3) presses against the tapered hole (13).

5. The automatic exhaust structure of a material press according to claim 4 is characterized in that: The diameter of the lower large round block (222) of the valve core block and the diameter of the O-ring (3) are both larger than the small end diameter of the valve seat tapered hole (13) and smaller than the large end diameter of the tapered hole.

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