Boosting oil cylinder

Abstract

The utility model discloses a reinforcement oil cylinder which comprises a cylinder bottom, a cylinder barrel, a guide sleeve and a piston rod. The hydraulic cylinder is characterized in that an inner cavity guide sleeve is fixedly arranged in the middle of the inner wall of the cylinder barrel, the piston rod penetrates through the inner cavity guide sleeve and the guide sleeve in a sliding mode, and a front piston and a rear piston are fixedly connected to the piston rod on the two axial sides of the inner cavity guide sleeve. A cavity extending oil port communicated with the front end face of the inner cavity guide sleeve and a cavity shrinking oil port communicated with the rear end face of the inner cavity guide sleeve are formed in the cylinder barrel, and an extending oil way communicated with the outer circumference of the piston rod between the inner cavity guide sleeve and the front piston and the rear end face of the piston rod is arranged in the piston rod. A retraction oil way communicated with the outer circumference of the piston rod in front of the rear piston and the outer circumference of the piston rod in front of the front piston is arranged in the piston rod; according to the utility model, the pushing force and pulling force of the piston rod during extension and retraction can be increased, and the requirements of heavy-load working conditions can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a force increasing oil cylinder. BACKGROUND

[0002] The existing oil cylinder comprises a cylinder bottom, a cylinder barrel, a guide sleeve and a piston rod connected with each other, only one piston is arranged on the piston rod, the thrust and the pulling force of the piston rod during extension and retraction are determined by oil pressure and the pressure receiving area of the piston, the thrust and the pulling force are limited under the condition of the oil pressure, and it is difficult to meet the needs of heavy load working conditions. SUMMARY

[0003] The utility model discloses in order to solve the technical problem of the prior art, provide a force increasing oil cylinder, it can increase the thrust and the pulling force of the piston rod during extension and retraction, can meet the needs of heavy load working conditions.

[0004] In order to achieve the above object, the utility model discloses a force increasing oil cylinder, which comprises a cylinder bottom, a cylinder barrel and a guide sleeve connected with each other and a piston rod, characterized in that an inner cavity guide sleeve is fixedly arranged in the middle of the inner wall of the cylinder barrel, the piston rod slides through the inner cavity guide sleeve and the guide sleeve, front and rear pistons are fixedly connected to the piston rod on the axial two sides of the inner cavity guide sleeve, the cylinder barrel is internally provided with an extension cavity oil port communicated with the front end face of the inner cavity guide sleeve and a retraction cavity oil port communicated with the rear end face of the inner cavity guide sleeve, the piston rod is internally provided with an extension oil path communicated between the outer circumference of the piston rod and the front end face of the piston rod between the inner cavity guide sleeve and the front piston, and the piston rod is internally provided with a retraction oil path communicated between the outer circumference of the front piston rod on the front side of the rear piston and the outer circumference of the front piston rod on the front side of the front piston.

[0005] The utility model discloses in order to solve the technical problem of the prior art, provide a force increasing oil cylinder, it can increase the thrust and the pulling force of the piston rod during extension and retraction, can meet the needs of heavy load working conditions.

[0006] As a further improvement of the utility model, the inner diameter of the cylinder barrel on the axial two sides of the inner cavity guide sleeve and the outer diameter of the piston rod are equal, the thrust and the pulling force generated by the two pistons are equal, and the piston rod can avoid bearing internal stress.

[0007] As a further improvement of the utility model, a groove is arranged in the center of the inner end face of the cylinder bottom, and the rear end of the extension oil path is connected with the groove, so that the oil pressure can quickly act on the front end face of the rear piston, and the response speed during extension is improved.

[0008] As a further improvement of the utility model, a sink groove is arranged in the front end face of the rear piston, and one end of the retraction oil path is connected with the sink groove, so that one end of the retraction oil path and the retraction cavity oil port are always connected, and the stroke of the piston rod is increased.

[0009] In summary, the utility model can increase the thrust and pull of the piston rod when it is extended and retracted, and can meet the needs of high-load working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the front view of the embodiment of the present utility model.

[0011] Figure 2 This is a front view of the piston rod in the extended state of the embodiment of the utility model. DETAILED DESCRIPTION

[0012] The present invention will be further described in detail below with reference to the accompanying drawings.

[0013] like Figure 1 As shown, a booster oil cylinder of this embodiment comprises a connected cylinder bottom 1, a cylinder barrel 2 and a guide sleeve 3, and a piston rod 4; an inner cavity guide sleeve 5 is integrally fixed in the middle of the inner wall of the cylinder barrel 2, and the piston rod 4 slides through the inner cavity guide sleeve 5 and the guide sleeve 3, and a front piston 6 and a rear piston 7 are fixed to the piston rod 4 on both sides of the axial direction of the inner cavity guide sleeve 5. The inner diameter of the cylinder barrel and the outer diameter of the piston rod on both sides of the axial direction of the inner cavity guide sleeve 5 are equal; the cylinder barrel 1 is provided with an extension cavity oil port 8 communicated with the front end face of the inner cavity guide sleeve 5, and a rear piston 7 is fixed to the piston rod 4 on both sides of the axial direction of the inner cavity guide sleeve 5. A retraction oil port 9 communicates with the rear end face of the sleeve 5, and an extension oil passage 10 is provided in the piston rod 4, which connects the outer circumference of the piston rod 4 between the inner cavity guide sleeve and the front piston and the rear end face of the piston rod. A groove 12 is provided at the center of the inner end face of the cylinder bottom 1, and the rear end of the extension oil passage 10 is connected to the groove 12; a retraction oil passage 11 is provided in the piston rod 4, which connects the outer circumference of the piston rod 4 on the front side of the rear piston and the outer circumference of the piston rod 4 on the front side of the front piston, and a sink groove 13 is provided on the front end face of the rear piston 7, and the front end of the retraction oil passage 11 is connected to the sink groove 13.

[0014] The utility model has a front piston 6 and a rear piston 7 fixedly connected to the piston rod 4. When in use, the oil inlet of the extension chamber oil port 8 acts on the rear end surfaces of the front piston 6 and the rear piston 7 through the extension oil passage 10, pushing the piston rod 4 to extend (such as Figure 2 As shown); the oil inlet of the retraction chamber oil port 9 acts on the front end surfaces of the front piston 6 and the rear piston 7 through the retraction oil passage 11, pushing the piston rod 4 to retract; the thrust and pull of the two pistons can be superimposed on the piston rod 4, which can increase the thrust and pull of the piston rod 4 when extending and retracting, and can meet the needs of high-load working conditions; the inner diameter of the cylinder and the outer diameter of the piston rod on both axial sides of the inner cavity guide sleeve 5 are equal, and the thrust and pull generated by the two pistons are equal, which can prevent the piston rod 4 from being subjected to internal stress;

[0015] The groove 12 facilitates the rapid action of oil pressure on the end face of the rear piston 7, thereby improving the response speed when extending; the sunken groove 13 ensures that the front end of the retraction oil passage 11 is always connected to the shrinkage cavity oil port 9, thereby increasing the stroke of the piston rod.

Claims

1. A booster oil cylinder, comprising a connected cylinder bottom, a cylinder barrel, a guide sleeve, and a piston rod; characterized in that An inner cavity guide sleeve is fixedly provided in the middle of the inner wall of the cylinder, and the piston rod slides through the inner cavity guide sleeve and the guide sleeve, and a front piston and a rear piston are fixedly connected to the piston rod on both axial sides of the inner cavity guide sleeve. An extension cavity oil port communicating with the front end face of the inner cavity guide sleeve and a retraction cavity oil port communicating with the rear end face of the inner cavity guide sleeve are provided in the cylinder, an extension oil path connecting the outer circumference of the piston rod between the inner cavity guide sleeve and the front piston and the rear end face of the piston rod is provided in the piston rod, and a retraction oil path connecting the outer circumference of the piston rod on the front side of the rear piston and the outer circumference of the piston rod on the front side of the front piston is provided in the piston rod.

2. A booster cylinder according to claim 1, characterized in that The inner diameter of the cylinder and the outer diameter of the piston rod on both axial sides of the inner cavity guide sleeve are equal.

3. A booster cylinder according to claim 1 or 2, characterized in that A groove is provided at the center of the inner end surface of the cylinder bottom, and the rear end extending out of the oil passage is connected to the groove.

4. A booster cylinder according to claim 3, characterized in that A sink groove is provided on the front end surface of the rear piston, and one end of the retraction oil passage is connected to the sink groove.

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