Built-in stop valve lifting oil cylinder of heavy forklift

Abstract

The utility model relates to the technical field of lifting oil cylinders, and discloses a built-in stop valve lifting oil cylinder of a heavy forklift, which comprises a stop pipe, a supplement mechanism, a guide sleeve, a guide structure, a cylinder body, a channel hole, an oil pipe, an assembly cover and a movable rod. The hollow groove between the guide structure and the cylinder body circulates corresponding to the sealing pipe, so that a lubricant in the box body enters the hollow groove from the circulation block and keeps a lubricating effect with the inner wall of the cylinder body under the sealing movement of the piston, and when the piston reciprocates to the rightmost end of the cylinder body, the hollow groove correspondingly circulates with the sealing pipe again, so that the effect of supplementing the lubricant is realized; and the left end and the right end of the movable rod achieve the effect of stabilizing the outer side pressure through a hollow groove and a second hollow groove, then the pressure balance state is kept for translation pushing when the movable rod moves in a sealed mode, and the situation that the friction between the moving position of the movable rod and the cylinder body is increased is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to lifting oil cylinder technical field, concretely is a heavy duty fork truck built -in cut -out valve lifting oil cylinder. BACKGROUND

[0002] The cut -out valve drives the valve flap movement through the actuator (such as pneumatic diaphragm, piston or electromagnetic device), realizes the quick cut -off or connection of fluid, and the cut -out valve connected oil cylinder is arranged in the heavy duty fork truck, and the oil cylinder is driven by the flow of fluid, so that the lifting oil cylinder of the heavy duty fork truck realizes the lifting movement by the action of hydraulic pressure, and the operator controls the change of lifting position by operating the operating lever of the fork truck, but the piston reciprocating motion needs lubricating oil to lubricate, avoids producing too big friction, and the lubricating oil is easy to mix into the oil cylinder under each activity of the piston, and it is easy to make lubricating oil slowly reduce, thereby increasing the friction resistance, increasing the friction force of the piston hydraulic pressure movement of the lifting oil cylinder, and when the piston rod is pushed, the periphery of the moving position is easy to be extruded by the unbalanced hydraulic oil, and the problem of the piston rod friction cylinder inner wall is easy to cause. CONTENT

[0003] The utility model provides a heavy duty fork truck built -in cut -out valve lifting oil cylinder, it overcomes the insufficient described in the background art.

[0004] The utility model solves the technical problem by adopting the technical scheme of:

[0005] A heavy duty fork truck built -in cut -out valve lifting oil cylinder, including stop pipe, supplementary mechanism, guide sleeve, guide structure, cylinder body, passageway hole, oil pipe, assembly cover and movable rod, the guide sleeve and assembly cover are fixed at the left and right sides of the cylinder body respectively, the movable rod, the guide structure is slidably connected inside the cylinder body, the stop pipe is arranged at the side of guide structure, and the stop pipe and guide structure are fixed at one end of the movable rod, the movable rod left end is slidably connected inside the guide sleeve, the oil pipe is arranged at one side of the cylinder body, the passageway hole is arranged in the assembly cover, the passageway hole is internally provided with an explosion -proof valve, the supplementary mechanism is arranged inside the cylinder body, and the supplementary mechanism is located at the corresponding position outside the guide structure;

[0006] The supplementary mechanism is provided with a box, a flow block and a sealing pipe, the flow block is arranged inside the sealing pipe, and the lowermost end of the flow block is located on the same straight line with the inner wall of the cylinder body, the sealing pipe is arranged inside the cylinder body, and the sealing pipe is connected with the box at the outer end, the outlet position of the box is provided with a sealing rod, a lubricant is sealed and filled in the box, and the lubricant is drained to the outside of the guide structure through the flow block.

[0007] A preferred technical solution: The passage hole introduces hydraulic oil, and the pressure of the hydraulic oil is controlled through the explosion-proof valve, so that the hydraulic oil pushes the right end of the movable rod at the passage hole position. At this time, the hydraulic oil introduced into the cylinder is pushed out, and the movable rod is in a hydraulic pushing state.

[0008] A preferred technical solution: The right end of the movable rod is in the shape of a smaller diameter cylinder, and the right end of the movable rod is limited by the stop tube and the guide structure, so that the right end of the movable rod translates in the cylinder.

[0009] A preferred technical solution: The flow block includes a cross, a pipe, a check valve, a cylindrical rod, and a limiting plate. The cross is arranged inside the pipe. The cylindrical rod is arranged in a stepped manner under the cross and is arranged in a circular array around the cross. The limiting plate is arranged inside the pipe and has an angle consistent with the stepped angle of the cylindrical rod. The check valve is arranged inside the pipe and is located on the same central axis as the limiting plate. The pipe is arranged inside the sealing pipe.

[0010] A preferred technical solution: The limiting plate is divided into four and is arranged in a triangular pyramid shape. The top angle of the four limiting plates is 120°, and the four limiting plates are pressed against each other.

[0011] A preferred technical solution: The guide structure includes a first sealing ring, a guide ring, a stop ring, a first hollow groove, and a piston. The stop ring and the first sealing ring are arranged on the inside and outside of the piston, respectively. The guide ring is arranged outside the piston. The first hollow groove is located outside the piston. The first sealing ring and the guide ring are sealed in the cylinder, so that a sealed space is formed between the first hollow groove and the cylinder. When the piston is blocked by the assembled cover, the replenishment mechanism flows the lubricant into the sealed space corresponding to the first hollow groove.

[0012] A preferred technical solution: The guide sleeve is provided with a second sealing ring, a second hollow groove, and a second stop ring on the inside. The second sealing ring is sealed with the outside of the movable rod. The second stop ring is in sliding contact with the outside of the movable rod. There is a sealing gap between the second hollow groove and the movable rod. The second stop ring and the second sealing ring balance the pressure on the outside of the movable rod through the sealing gap.

[0013] Compared with the prior art, the technical solution has the following advantages:

[0014] The first hollow groove between the guide structure and the cylinder body corresponds to the sealing pipe flow, so that the lubricant in the box body enters the first hollow groove from the flow block, and the lubrication effect with the inner wall of the cylinder body is maintained under the sealing activity of the piston, when the piston reciprocatingly moves to the rightmost end of the cylinder body, the first hollow groove flows again corresponding to the sealing pipe, the effect of supplementing the lubricant is realized, the loss of the lubricant after the movement of the movable rod is avoided, and the excessive friction between the movable rod and the guide structure caused by too little lubricant is prevented.

[0015] When the right end of the movable rod is pushed by the hydraulic oil pressure in the utility model, the piston is driven to move in the cylinder body through the connection of the blocking ring, at this time, the pressure balance of the outer side of the piston is realized through the sealing between the first sealing ring and the guide ring, and the guide sleeve position of the left end of the movable rod is sealed and moved through the second sealing ring and the second blocking ring and the movable rod, the pressure balance of the movable rod is realized through the second hollow groove, and then the left and right ends of the movable rod realize the effect of stable pressure on the outer side through the first hollow groove and the second hollow groove, and the pressure of the left and right ends of the movable rod is stable, and then the pressure balance state is maintained when the movable rod is sealed and moved, so that the friction between the movable rod and the cylinder is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described below in combination with the drawings and examples.

[0017] Figure 1 It is the overall view of the utility model.

[0018] Figure 2 It is the plane schematic view of the supplement mechanism.

[0019] Figure 3 It is the three-dimensional section schematic view of the flow block.

[0020] Figure 4 It is the local enlarged schematic view of the guide structure.

[0021] Figure 5 It is the local enlarged schematic view of the guide sleeve.

[0022] In the drawing: stop pipe-1, supplement mechanism-2, guide sleeve-3, guide structure-4, cylinder body-5, channel hole-6, oil pipe-7, assembly cover-8, movable rod-9, box body-21, flow block-22, sealing pipe-23, cross-221, through pipe-222, check valve-223, cylindrical rod-224, limit plate-225, first sealing ring-41, guide ring-42, blocking ring-43, first hollow groove-44, piston-45, second sealing ring-31, second hollow groove-32, second blocking ring-33. DETAILED DESCRIPTION

[0023] As Figures 1 to 5As shown, the utility model discloses a kind of built-in cut-off valve lifting oil cylinder of heavy fork truck, including stop pipe 1, supplementary mechanism 2, guide sleeve 3, guide structure 4, cylinder 5, channel hole 6, oil pipe 7, assembling cover 8 and movable rod 9, the guide sleeve 3 and assembling cover 8 are respectively fixed in the left and right sides of the cylinder 5, the movable rod 9, the guide structure 4 is slidably fitted inside cylinder 5, the stop pipe 1 is arranged in the side of guide structure 4, and stop pipe 1 and guide structure 4 are fixed in one end of movable rod 9, the movable rod 9 left end is slidably fitted inside guide sleeve 3, the oil pipe 7 is arranged in one side of cylinder 5, the channel hole 6 is arranged in assembling cover 8, the channel hole 6 is internally provided with explosion-proof valve, the supplementary mechanism 2 is arranged inside cylinder 5, and supplementary mechanism 2 is located at the corresponding position outside guide structure 4.

[0024] The supplementary mechanism 2 is provided with a box 21, a flow block 22 and a sealing pipe 23, the flow block 22 is arranged inside the sealing pipe 23, and the lowermost end of the flow block 22 is located on the same straight line with the inner wall of the cylinder 5, the sealing pipe 23 is arranged inside the cylinder 5, and the sealing pipe 23 is connected with the box 21 at the outer end, the outlet position of the box 21 is provided with a sealing rod, a lubricant is sealed and filled in the box 21, and the lubricant is drained to the outside of the guide structure 4 through the flow block 22.

[0025] And the channel hole 6 introduces hydraulic oil, and the pressure of the hydraulic oil is controlled through the explosion-proof valve, so that the hydraulic oil pushes the right end of the movable rod 9 at the position of the channel hole 6, at this time, the hydraulic oil introduced into the cylinder 5 through the oil pipe 7 is pushed out, so that the movable rod 9 is in a hydraulic pushing state.

[0026] And the right end of the movable rod 9 is in the shape of a smaller diameter cylinder, and the right end of the movable rod 9 is limited by the stop pipe 1 and the guide structure 4, so that the right end of the movable rod 9 translates inside the cylinder 5.

[0027] The flow block 22 includes a cross 221, a pipe 222, a check valve 223, a cylindrical rod 224 and a limiting plate 225, the cross 221 is arranged inside the pipe 222, the cylindrical rod 224 is provided with three, arranged in a ladder shape on the lower side of the cross 221, and the cylindrical rod 224 is arranged in a ring array around the cross 221, the limiting plate 225 is arranged inside the pipe 222, and the angle of the limiting plate 225 is consistent with the ladder angle of the cylindrical rod 224, the check valve 223 is arranged inside the pipe 222, and the check valve 223 is located on the same central axis with the limiting plate 225, and the pipe 222 is arranged inside the sealing pipe 23.

[0028] And the limiting plate 225 is divided into four, arranged in a triangular pyramid shape, the top angle of the intersection of the four limiting plates 225 is 120°, and the four limiting plates 225 are sealed against each other.

[0029] The guiding structure 4 comprises a first sealing ring 41, a guide ring 42, a blocking ring 43, a first hollow groove 44 and a piston 45, the blocking ring 43 and the first sealing ring 41 are arranged on the inner and outer sides of the piston 45 respectively, the guide ring 42 is arranged on the outer side of the piston 45, the first hollow groove 44 is located on the outer side of the piston 45, the first sealing ring 41 and the guide ring 42 are in sealing movement in the inner side of the cylinder body 5, so that the first hollow groove 44 and the cylinder body 5 form a sealed space, when the piston 45 is blocked by the assembling cover 8, the supplement mechanism 2 circulates lubricant in the sealed space corresponding to the first hollow groove 44.

[0030] The first sealing ring 41 is in an overturned "V" shape structure and is made of rubber material and has elasticity, and the first sealing ring 41 elastically abuts between the piston 45 and the cylinder body 5, so that the sealing movement effect is realized.

[0031] The connecting position of the piston 45 and the movable rod 9 is fastened by a fastening screw, and the movable rod 9 and the piston 45 are synchronously moved.

[0032] The inner side of the guide sleeve 3 is provided with a second sealing ring 31, a second hollow groove 32 and a second blocking ring 33, the outer side of the movable rod 9 is in sealing movement with the second sealing ring 31, the second blocking ring 33 abuts on the outer side of the movable rod 9 and slides, and there is a sealing gap between the second hollow groove 32 and the movable rod 9, so that the second blocking ring 33 and the second sealing ring 31 balance the pressure on the outer side of the movable rod 9.

[0033] In the utility model, the hydraulic oil passes through the explosion-proof valve and extrudes the right end of the movable rod 9, so that the guiding structure 4 drives the guiding structure 4 to move in the cylinder body 5, the movable rod 9 is translated through the sealing movement between the left end of the assembling cover 8 and the inner side of the guide sleeve 3, then the hydraulic oil in the inner side of the cylinder body 5 is discharged from the oil pipe 7, the movable pressure of the hydraulic oil connected with the oil pipe 7 and the passage hole 6 is controlled, the effect that the hydraulic oil drives the movable rod 9 is realized, when the guiding structure 4 is located at the rightmost end, the first hollow groove 44 between the guiding structure 4 and the cylinder body 5 corresponds to the circulation of the sealing pipe 23, the lubricant in the box body 21 enters the first hollow groove 44 from the circulation block 22, and the lubrication effect of the inner wall of the cylinder body 5 is maintained under the sealing movement of the piston 45, when the piston 45 reciprocally moves to the rightmost end of the cylinder body 5, the first hollow groove 44 again corresponds to the circulation of the sealing pipe 23, so that the effect that the lubricant is supplemented is realized.

[0034] The utility model discloses, the first hollow groove 44 is in sealed state, and the easy generation negative pressure adsorption force after sealing activity makes the spacing plate 225 present downward opening and closing state, and lubricant is conveniently circulated and enters the first hollow groove 44, when the first hollow groove 44 is separated from corresponding sealing pipe 23, the hydraulic oil of piston 45 right -hand end is extruded spacing plate 225 under pressure, and spacing plate 225 keeps the conical state under the ladder block of cross 221 lower end cylindrical rod 224, and under the pressure of hydraulic oil, and spacing plate 225 is blocked by cylindrical rod 224 and mutually presses and seals, avoid the activity of movable rod 9 and cause lubricant loss after activity, prevent that lubricant is too little and cause movable rod 9 and guide structure 4 between the friction too big.

[0035] The utility model discloses, the right -hand end of movable rod 9 is pushed when being driven by hydraulic oil pressure, and piston 45 is driven in cylinder body 5 through the connecting of baffle ring 43, when, through the sealing between first sealing washer 41 and guide ring 42, realize the pressure balance of the outside of piston 45, and the position of guide bushing 3 left -hand end of movable rod 9, through the sealing activity of second sealing washer 31 and second baffle ring 33 and movable rod 9, through second hollow groove 32 carries out pressure balance to movable rod 9, and then movable rod 9 left and right two ends realize the effect that the outside pressure is stable through first hollow groove 44 and second hollow groove 32, and make movable rod 9 left and right two ends pressure stable, then keep pressure balance state and translate and push when movable rod 9 sealing activity, avoid the friction of movable rod 9 and cylinder body 5 and increase.

[0036] The above, only for the preferred embodiment of the utility model has been, therefore can not be limited by this to limit the range of the utility model implementation, namely the equivalent change and modification that the utility model patent range and the content of specification made, all should still belong to the range that the utility model covers.

Claims

1. A heavy-duty fork truck built-in cut valve lift cylinder, characterized by, Including stop pipe, supplementary mechanism, guide sleeve, guide structure, cylinder, channel hole, oil pipe, assembly cover and movable rod, the guide sleeve and assembly cover are fixed on the left and right sides of the cylinder respectively, the movable rod, the guide structure is slidingly fitted inside the cylinder, the stop pipe is arranged on the side of the guide structure, and the stop pipe and the guide structure are fixed on one end of the movable rod, the left end of the movable rod is slidingly fitted inside the guide sleeve, the oil pipe is arranged on one side of the cylinder, the channel hole is arranged in the assembly cover, the inside of the channel hole is provided with an explosion-proof valve, the supplementary mechanism is arranged inside the cylinder, and the supplementary mechanism is located at the corresponding position outside the guide structure; The supplementary mechanism is provided with a box body, a flow block and a sealing pipe, the flow block is arranged inside the sealing pipe, and the lowermost end of the flow block is located on the same straight line with the inner wall of the cylinder, the sealing pipe is arranged inside the cylinder, and the sealing pipe is connected with the box body at the outer end, a sealing rod is arranged at the outlet position of the box body, a lubricant is sealed and filled in the box body, and the lubricant is drained to the outside of the guide structure through the flow block.

2. The heavy-duty fork truck built-in cut valve lift cylinder according to claim 1, characterized in that, The flow block comprises a cross, a pipe, a check valve, a cylindrical rod and a limiting plate, the cross is arranged inside the pipe, the cylindrical rod is arranged in a stepped manner at the lower side of the cross, and the cylindrical rod is arranged in a circular array around the cross, the limiting plate is arranged inside the pipe, and the angle of the limiting plate is consistent with the stepped angle of the cylindrical rod, the check valve is arranged inside the pipe, and the check valve is located on the same central axis as the limiting plate, and the pipe is arranged inside the sealing pipe.

3. The heavy-duty fork truck built-in cut valve lift cylinder according to claim 2, characterized in that, The limiting plate is divided into four parts and is arranged in a triangular pyramid shape, the top angle of the intersection of the four limiting plates is 120°, and the four limiting plates are sealed against each other.

4. The heavy-duty fork truck built-in cut valve lift cylinder according to claim 3, characterized in that, The guide structure comprises a first sealing ring, a guide ring, a check ring, a first hollow groove and a piston, the check ring and the first sealing ring are arranged on the inner and outer sides of the piston respectively, the guide ring is arranged on the outer side of the piston, the first hollow groove is located on the outer side of the piston, the first sealing ring and the guide ring are sealingly movable inside the cylinder, so that a sealed space is formed between the first hollow groove and the cylinder, when the piston is blocked by the assembly cover, the supplementary mechanism flows lubricant into the sealed space corresponding to the first hollow groove.

5. The heavy-duty fork truck built-in cut valve lift cylinder according to claim 4, wherein, The inside of the guide sleeve is provided with a second sealing ring, a second hollow groove and a second check ring, the outer side of the movable rod is sealingly movable with the second sealing ring, the second check ring abuts against the outer side of the movable rod to slide, and there is a sealing gap between the second hollow groove and the movable rod, and the second check ring and the second sealing ring balance the pressure on the outer side of the movable rod through the sealing gap.

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