Pneumatic hydraulic station with slow descending function

Abstract

The utility model discloses a pneumatic hydraulic station with a slow descending function. The pneumatic hydraulic station is characterized by further comprising an oil drain valve which is arranged on a hydraulic seat and a hydraulic valve block, is used for draining oil and has the slow descending function during oil drainage; the oil drain valve comprises an oil drain valve seat, an oil drain valve rod, an oil drain valve element movably installed in the oil drain valve seat, a first-stage valve element movably installed in the oil drain valve element and a spiral oil drain channel arranged on the outer side of the oil drain valve element and used for reducing the oil return speed to achieve the slow descent effect. The spiral oil drainage channel is arranged on the outer side of the oil drainage valve element, when oil is drained, the medium is drained through the spiral oil drainage channel, and through the arrangement of the spiral oil drainage channel, the flowing distance of the medium is prolonged, the flowing area of the medium is reduced, and the flowing speed of the medium is reduced, so that the effect of reducing the oil return speed is achieved. And the hydraulic equipment can slowly descend when supporting a heavy object, so that the problems that the descending speed of the hydraulic equipment is too high due to high oil return speed, and the supported heavy object falls off due to the high descending speed are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pneumatic hydraulic station, concretely refers to a pneumatic hydraulic station with slow descending function. BACKGROUND

[0002] The working principle of the pneumatic hydraulic station is to use the reciprocating motion of the compressed gas pushing piston assembly and pump oil piston rod to form a pump suction pressure difference, so as to pump the hydraulic oil from the hydraulic oil tank to the hydraulic cylinder, and when the hydraulic cylinder resets, stop the compressed gas from being input, and open the oil drain valve, at this time the hydraulic oil in the hydraulic cylinder will flow back to the hydraulic oil tank through the oil return channel.

[0003] In the prior art, when the pneumatic hydraulic station bleeds pressure and returns oil, the operator pushes down the oil drain valve rod by stepping on the foot switch, thereby opening the oil drain valve to return oil, but in actual use, the oil return speed is often too fast, especially when the hydraulic equipment supports heavy objects, the oil pressure is increased by the gravity of the heavy objects, which further increases the oil return speed, and once the oil return speed is too fast, the reaction force generated after the hydraulic equipment is lowered can easily cause the supported heavy objects to bounce down or even fall off the hydraulic equipment, which can damage the supported objects and cause safety accidents when the supported objects fall.

[0004] In the prior art, the cylinder barrel of the pneumatic pump in the pneumatic hydraulic station is provided with a vent groove, in the prior art, an axial hole is machined on the cylinder barrel wall during machining, then two radial holes penetrating the axial hole are machined at the set position, a vent groove is formed through the two radial holes and the axial hole, and a steel ball is installed outside the radial hole and on one side of the axial hole to seal the hole, but this way requires a thick cylinder wall, and the hole is sealed by the steel ball, which has the risk of leakage, once leakage occurs, the gas in the cylinder will enter the oil tank, and the oil in the oil tank will also enter the cylinder, causing damage to the equipment and making it unable to be used normally, and this way has many machining steps and is difficult to process and low in efficiency, therefore, a pneumatic hydraulic station with slow descending function is proposed. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the above problems and proposes a pneumatic hydraulic station with slow descending function.

[0006] In order to achieve the above object, the utility model provides the following technical scheme a slow function pneumatic hydraulic station, including box, foot switch setting on the box, hydraulic pump setting in the box and the pneumatic pump setting in the box for driving hydraulic pump to act, the hydraulic pump contains hydraulic valve block installed in the box and hydraulic seat installed on the box, characterized by still including the oil drain valve for draining oil and slow function when draining oil setting on the hydraulic seat and hydraulic valve block, the oil drain valve contains oil drain valve seat, oil drain valve stem, movable installation oil drain valve core in the oil drain valve seat, movable installation first stage valve core in the oil drain valve core and the spiral oil drain channel for reducing the oil return speed and achieving the slow effect setting on the oil drain valve core outside.

[0007] Further preferably, the oil drain valve further comprises a reset spring one for pushing the first stage valve core and the oil drain valve core reset and a reset spring two for pushing the oil drain valve stem reset.

[0008] Further preferably, the oil drain valve core end portion is further provided with an oil drain groove for avoiding the oil hole being blocked after the oil drain valve stem and the oil drain valve core end portion contact.

[0009] Further preferably, the pneumatic pump comprises a cylinder, a pneumatic piston slidably installed in the cylinder, a pneumatic pump body connected with the hydraulic valve block and a pneumatic pump core one end of which is connected with the pneumatic piston and the other end of which is slidably installed in the pneumatic pump body.

[0010] Further preferably, the pneumatic piston is provided with a sliding portion in contact with the cylinder on both sides, and a gas cavity is formed between the two sliding portions; the cylinder is provided with a plurality of air grooves for communicating the side chamber of the pneumatic piston and the gas cavity.

[0011] Further preferably, the length of the air groove is greater than the length of the sliding portion.

[0012] Further preferably, the air groove is formed by stamping or is integrally formed with the cylinder.

[0013] The utility model discloses beneficial effect: through setting up primary valve core in the oil drain valve core, when carrying out oil drain, first open primary valve core, and the gap between primary valve core and oil drain valve core is used to carry out small flow oil return pressure relief, when oil drain valve stem is in the process of continuously pushing primary valve core opening and contacts oil drain valve core, pushes oil drain valve core and opens oil drain valve core, and medium carries out oil drain through oil drain valve core and primary valve core simultaneously, through setting up spiral oil drain passage outside oil drain valve core, when oil drain, medium carries out oil drain through spiral oil drain passage, through the setting of spiral oil drain passage, prolongs the flow distance of medium, reduces the medium flow area, reduces the medium flow speed and reaches the effect of reducing the oil return speed, when the hydraulic equipment supports heavy object, can slowly descend, avoids the oil return speed fast and makes the hydraulic equipment descending speed too fast, avoids the problem of the heavy object supported falling down because of the fast descending speed.

[0014] By directly integrally forming or by stamping press forming a ventilation groove on the cylinder, it is not necessary to punch a hole on the cylinder to form a hole type ventilation groove during processing, so the outer wall of the cylinder does not need to be set thick, and meanwhile, the sealing property of the hole is not needed to be worried about, the overall structure is simpler, the production process is simpler, and the production efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0015] ATTACHMENT Figure 1 It is the structure schematic diagram of the utility model;

[0016] ATTACHMENT Figure 2 It is the sectional structure schematic diagram of the utility model;

[0017] ATTACHMENT Figure 3 It is the local enlarged structure schematic diagram of the utility model;

[0018] ATTACHMENT Figure 4 It is the local structure schematic diagram of the oil drain valve in the utility model;

[0019] ATTACHMENT Figure 5 It is the structure schematic diagram of the oil drain valve core in the utility model.

[0020] Legend: 1, box; 2, foot switch; 3, hydraulic pump; 31, hydraulic valve block; 32, hydraulic seat; 4, pneumatic pump; 41, cylinder; 42, pneumatic piston; 43, pneumatic pump body; 44, pneumatic pump core; 45, sliding part; 46, air cavity; 47, ventilation groove; 5, oil drain valve; 51, oil drain valve seat; 52, oil drain valve stem; 53, oil drain valve core; 54, primary valve core; 55, spiral oil drain passage; 56, reset spring one; 57, reset spring two; 58, oil drain groove. DETAILED DESCRIPTION

[0021] Now we combine the drawings and make further description to the pneumatic hydraulic station with slow descending function.

[0022] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture shown in the drawings, and if the specific posture changes, the directional indications will also change accordingly.

[0023] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly; for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] Referring to Figures 1-5 A kind of pneumatic hydraulic station with slow drop function shown in the figure, including box 1, foot switch 2 being arranged on box 1, hydraulic pump 3 being arranged in box 1 and pneumatic pump 4 being arranged in box 1 for driving hydraulic pump 3 to act;The hydraulic pump 3 includes hydraulic valve block 31 installed in box 1 and hydraulic seat 32 installed on box 1;Characterized in that it further includes oil drain valve 5 for draining oil and slow drop function when draining oil is arranged on hydraulic seat 32 and hydraulic valve block 31;The oil drain valve 5 includes oil drain valve seat 51, oil drain valve stem 52, movable installation oil drain valve core 53 in oil drain valve seat 51, movable installation first valve core 54 in oil drain valve core 53 and spiral oil drain passage 55 for reducing oil return speed and achieving slow drop effect being arranged on the outside of oil drain valve core 53;

[0025] By setting first valve core 54 in oil drain valve core 53, when draining oil, first valve core 54 is opened first, small-flow oil return pressure relief is carried out through the gap between first valve core 54 and oil drain valve core 53, when oil drain valve stem 52 contacts oil drain valve core 53 and pushes oil drain valve core 53 to move downward to open oil drain valve core 53 in the process of continuously pushing first valve core 54 to open, medium is drained synchronously through oil drain valve core 53 and first valve core 54, and at the same time, spiral oil drain passage 55 is arranged on the outside of oil drain valve core 53, when draining oil, medium is drained through spiral oil drain passage 55, by the arrangement of spiral oil drain passage 55, the flow distance of medium is prolonged, the flow area of medium is reduced, and the flow speed of medium is reduced to achieve the effect of reducing oil return speed, when hydraulic equipment supports heavy objects, it can slowly descend, avoid the problem that the oil return speed is too fast and the descending speed of hydraulic equipment is too fast, and avoid the problem that the supported heavy objects fall due to the fast descending speed.

[0026] In one embodiment, the oil drain valve 5 further comprises a reset spring 56 for pushing the primary valve core 54 and the oil drain valve core 53 back to the original position, and a reset spring 57 for pushing the oil drain valve rod 52 back to the original position; the reset force of the reset spring 56 pushes the oil drain valve core 53 and the primary valve core 54 upwards to cut off the oil drain path, and the reset force of the reset spring 57 is used to push the oil drain valve rod 52 back to the original position.

[0027] In one embodiment, the end of the oil drain valve core 53 is further provided with an oil drain groove 58 for avoiding the oil drain valve rod 52 from blocking the oil hole after contacting the end of the oil drain valve core 53; through the arrangement of the oil drain groove 58, when the end of the oil drain valve rod 52 contacts the oil drain valve core 53 and pushes the oil drain valve core 53 downwards, the oil still flows through the oil path between the primary valve core 54 and the oil drain valve core 53 for oil drain, and in combination with the oil path between the oil drain valve core 53 and the oil drain valve seat 51, two oil return paths are formed, which can effectively reduce the oil return speed without making the oil return speed too slow to affect the working efficiency.

[0028] In one embodiment, the pneumatic pump 4 comprises a cylinder 41, a pneumatic piston 42 slidingly installed in the cylinder 41, a pneumatic pump body 43 connected with the hydraulic valve block 31, and a pneumatic pump core 44 having one end connected with the pneumatic piston 42 and the other end slidingly installed in the pneumatic pump body 43.

[0029] In one embodiment, the pneumatic piston 42 is provided with sliding portions 45 on both sides and in contact with the cylinder 41, and a gas cavity 46 is formed between the sliding portions 45 on both sides; the cylinder 41 is provided with a plurality of air communication grooves 47 for communicating the side cavity of the pneumatic piston 42 and the gas cavity 46; the length of the air communication groove 47 is greater than the length of the sliding portion 45; during the forward movement of the pneumatic piston 42, when the sliding portion 45 on the rear side moves to the air communication groove 47, the cavity on the left side of the pneumatic piston 42 can be communicated with the gas cavity 46.

[0030] In one embodiment, the air communication groove 47 is formed by stamping or integrally formed with the cylinder 41;

[0031] By directly integrally forming the air communication groove 47 on the cylinder 41 or by stamping, the air communication groove 47 does not need to be punched on the cylinder 41 to form a hole type air communication groove 47, so that the outer wall of the cylinder 41 does not need to be set thicker, and at the same time, the sealing performance of the hole is not needed to be worried about, the overall structure is simpler, the production process is simpler, and the production efficiency is high.

[0032] In use, when the hydraulic equipment is used, the pneumatic pump 4 is started by the foot switch 2, and the pneumatic pump 4 drives the hydraulic pump 3 to move to use the oil in the oil tank for the hydraulic equipment.

[0033] When oil is discharged, the foot switch 2 is stepped on, the downward extrusion of the oil discharge valve rod 52 is formed through the foot switch 2, the oil discharge valve rod 52 contacts the primary valve core 54 and forms a downward thrust to the primary valve core 54 in the process of moving downward, the oil passage between the primary valve core 54 and the oil discharge valve core 53 is opened, small flow oil return is carried out, pressure is released, in the process of continuous downward movement of the oil discharge valve rod 52, the end portion contacts the oil discharge valve core 53 and pushes the oil discharge valve core 53 to move downward, the oil passage between the oil discharge valve core 53 and the oil discharge valve seat 51 is opened, the oil is returned through the oil passage between the primary valve core 54 and the oil discharge valve seat 51 and the spiral oil discharge channel 55 on the oil discharge valve seat 51, slow oil return is carried out, and the stability when the hydraulic equipment is lowered is improved; the foot switch 2 is released after the hydraulic equipment is lowered to the position, the oil discharge valve core 53 is reset through the reset force of the reset spring two 57, the primary valve core 54 and the oil discharge valve core 53 are pushed to reset through the reset force of the reset spring one 56, and the oil discharge oil passage is cut off.

[0034] The protection scope of the utility model is not limited to the above embodiment and its transformation. The routine modification and replacement of the person skilled in the art based on the content of the embodiment all belong to the protection scope of the utility model.

Claims

1. A pneumatic hydraulic station with slow drop function, comprising a box (1), a foot switch (2) arranged on the box (1), a hydraulic pump (3) arranged in the box (1), and a pneumatic pump (4) arranged in the box (1) for driving the hydraulic pump (3) to act; the hydraulic pump (3) comprises a hydraulic valve block (31) installed in the box (1) and a hydraulic seat (32) installed on the box (1); characterized in that The oil drain valve (5) is arranged on the hydraulic seat (32) and the hydraulic valve block (31) for oil draining and slow descending during oil draining, and comprises an oil drain valve seat (51), an oil drain valve rod (52), an oil drain valve core (53) movably arranged in the oil drain valve seat (51), a primary valve core (54) movably arranged in the oil drain valve core (53), and a spiral oil drain channel (55) arranged outside the oil drain valve core (53) for reducing the oil return speed to achieve the slow descending effect.

2. The pneumatic-hydraulic station with slow descent function according to claim 1, characterized in that: The oil drain valve (5) further comprises a reset spring one (56) for pushing the primary valve core (54) and the oil drain valve core (53) to reset, and a reset spring two (57) for pushing the oil drain valve rod (52) to reset.

3. The pneumatic-hydraulic station with slow descent function according to claim 2, characterized in that: The oil drain valve core (53) is further provided with an oil drain groove (58) at the end thereof to avoid the oil drain valve rod (52) from blocking the oil hole after contacting the end of the oil drain valve core (53).

4. The pneumatic hydraulic station with slow-down function according to claim 1, characterized in that: The pneumatic pump (4) comprises a cylinder barrel (41), a pneumatic piston (42) slidably arranged in the cylinder barrel (41), a pneumatic pump body (43) connected with the hydraulic valve block (31), and a pneumatic pump core (44) having one end connected with the pneumatic piston (42) and the other end slidably arranged in the pneumatic pump body (43).

5. The pneumatic-hydraulic station with slow descent function according to claim 4, characterized in that: The pneumatic piston (42) is provided with sliding portions (45) in contact with the cylinder barrel (41) on both sides, and a gas cavity (46) is formed between the sliding portions (45) on both sides.

6. A pneumatic hydraulic station with slow-down function according to claim 5, characterized in that: The length of the air passage groove (47) is greater than the length of the sliding portion (45).

7. The pneumatic hydraulic station with slow-down function according to claim 6, characterized in that: The air passage groove (47) is formed by stamping or is integrally formed with the cylinder barrel (41).

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