Monorail hoist brake oil cylinder

Abstract

The utility model discloses a monorail hoist brake oil cylinder which comprises a cylinder bottom, a cylinder barrel, a guide sleeve, a piston rod and a piston, the cylinder bottom and the cylinder barrel are connected, the piston rod and the piston are integrally connected, the cylinder bottom is fixedly connected with a rear baffle, the cylinder bottom is provided with a rodless cavity oil way, the front end of the piston rod is connected with a rod head, the rod head is fixedly connected with a front baffle, and a rod cavity oil way is arranged in the rod head. A brake spring is sleeved outside the cylinder barrel between the front baffle and the rear baffle, a stepped hole is formed in the piston rod, an oil supplementing one-way valve seat is arranged in the rear section of the stepped hole, and a pilot oil cavity positioned on the front side of a sealing surface of the oil supplementing one-way valve seat and outside a valve core is arranged in an inner cavity of the oil supplementing one-way valve seat; an oil way for connecting the stepped hole with the front end surface of the piston is arranged in the front section of the piston; a one-way valve group is arranged in the oil way; a section of axial oil passing groove is formed in the outer circle of the front section of the piston; radial oil passing holes communicated with the oil passing groove and the pilot oil cavity are formed in the piston and the oil supplementing one-way valve seat; the utility model has the advantages of simple structure, easy processing and manufacturing, and good reliability.

Description

Technical Field

[0001] The utility model relates to a brake oil cylinder, in particular to a brake oil cylinder used for a monorail crane. Background Art

[0002] With the continuous development of modern mines, various advanced equipment are widely used in coal production. Among the many mining transportation equipment, monorail cranes play an important role. Their safe and efficient operation is crucial to improving the overall mining efficiency. As a key component in the monorail crane system, the brake cylinder, its performance and reliability are directly related to the safety of personnel and transportation efficiency. The existing monorail crane brake cylinder, such as Figure 1As shown, it includes a connected cylinder bottom 31 and a cylinder barrel 32, a guide sleeve 33, an integrally connected piston rod 34 and a piston 35, the cylinder bottom 31 is welded and fixedly connected with a rear baffle 36, the cylinder bottom 31 is provided with a rodless chamber oil circuit 37, the front end of the piston rod 34 is connected with a front baffle 38, the front baffle 38 is welded and fixedly connected with a rod head 39, a rod chamber oil circuit 40 is provided in the rod head 39, a brake spring 41 is provided on the cylinder barrel between the front baffle 38 and the rear baffle 36, a stepped hole 42 is provided in the piston rod 34, the front end of the stepped hole 42 is connected with the rod chamber oil circuit 40, an oil replenishment one-way valve seat 43 is provided in the rear section of the stepped hole 42, and the oil replenishment one-way valve seat 43 A positioning sleeve 45 connected to the piston rod 34 by several screws 44 is provided at the rear side, a valve core 46 matching with its sealing surface is provided in the inner cavity of the oil replenishment check valve seat 43, a pilot oil chamber 47 located on the side of its sealing surface and outside the valve core is provided in the inner cavity of the oil replenishment check valve seat 43, a return spring 48 is provided between the valve core 46 and the end face of the stepped hole, a pressure feedback oil circuit 49 connected to the pilot oil chamber 47 is provided in the piston 35 and the oil replenishment check valve seat 43, and the entrance of the pressure feedback oil circuit 49 is located at the front end face of the piston 35; the piston rod 34 is fixedly connected to the check valve seat 50, and the stepped hole 42 in the piston rod 34 is connected to the check valve through the oil hole 51 The oil circuit in the seat 50 is connected, and a one-way valve group 52 is provided in the oil circuit; a connecting oil circuit 53 connected to the inlet of the pressure feedback oil circuit 49 is also provided in the one-way valve seat 50; when oil enters the rod chamber oil circuit 40, the oil passes through the stepped hole 42 and the oil hole 51 to push open the one-way valve group 52, and push the piston rod 34 to retract. At this time, the brake spring 41 plays a damping role; when the rod chamber oil circuit 40 stops entering oil and is connected to the oil return port, the piston rod 34 extends under the action of the brake spring 41 and generates a certain pressure in the rod chamber. At this time, the one-way valve group 52 is closed, and the oil pressure in the rod chamber acts on the pilot oil chamber through the connecting oil circuit 53 and the pressure feedback oil circuit 49 47. Push open the valve core 46, and the oil in the rod chamber flows back to the oil tank through the rodless chamber oil circuit 37. The disadvantages of this structure are: 1) The setting of the one-way valve seat 50 and its internal seal makes the structure complicated and prone to internal leakage; 2) The pressure feedback oil circuit 49 needs to be provided with more process holes, which is not only difficult to process, but also requires welding to seal the ends of the process holes. In addition, there are many welding points between the cylinder bottom 31 and the rear baffle 36, and the front baffle 38 and the rod head 39. The piston rod 34 is connected to the positioning sleeve 45 by screws 44, and the brake spring 41 will generate considerable vibration during operation, which is easy to cause cracking of the welding points and loosening of the screws 44, affecting reliability. Summary of the invention

[0003] The purpose of the utility model is to provide a monorail crane brake cylinder in view of the above-mentioned deficiencies in the prior art, which has not only a relatively simple structure, but also is easy to manufacture and has good reliability.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a monorail crane brake oil cylinder, including a connected cylinder bottom and cylinder barrel, a guide sleeve, an integrally connected piston rod and a piston, the cylinder bottom is fixedly connected to a rear baffle, the cylinder bottom is provided with a rodless chamber oil circuit, the front end of the piston rod is connected to a rod head, the rod head is fixedly connected to a front baffle and is provided with a rod chamber oil circuit, a brake spring is arranged on the outer sleeve of the cylinder barrel between the front baffle and the rear baffle, a stepped hole is arranged in the piston rod, the front end of the stepped hole is connected to the rod chamber oil circuit, an oil replenishment one-way valve seat is arranged in the rear section of the stepped hole, and the oil replenishment one-way valve seat A positioning sleeve connected to the piston is provided on the rear side, a valve core matched with its sealing surface is provided in the inner cavity of the oil-supply one-way valve seat, a pilot oil chamber located on the front side of its sealing surface and outside the valve core is provided in the inner cavity of the oil-supply one-way valve seat, and a return spring is provided between the valve core and the end face of the stepped hole; the characteristics are: an oil circuit connecting the stepped hole and the front end face of the piston is provided in the front section of the piston, and a one-way valve group is provided in the oil circuit; an axial oil groove is provided on the outer circle of the front section of the piston, and the piston and the oil-supply one-way valve seat are provided with radial oil holes connecting the oil groove and the pilot oil chamber.

[0005] The utility model eliminates the one-way valve seat, sets the one-way valve group in the piston, and does not need to set a seal. In addition, it is connected with the pilot oil chamber through the oil groove and the radial oil hole, and does not need other process holes and welding points. Not only is the structure relatively simple, easy to process and manufacture, but also there is no welding cracking point, and its reliability is good;

[0006] As a further improvement of the utility model, the positioning sleeve is placed in the stepped hole on the rear side of the oil replenishment one-way valve seat, the positioning sleeve is connected to the piston through a plurality of radial cylindrical pins, and a support ring is provided on the radial outer side of the cylindrical pins; under vibration conditions, the positioning sleeve and the piston rod connected by the cylindrical pins will not loosen, which can improve reliability;

[0007] As a further improvement of the utility model, the positioning sleeve is placed in the stepped hole on the rear side of the oil replenishment check valve seat, and the positioning sleeve is connected to the piston through a plurality of radial set screws; this can also improve reliability;

[0008] As a further improvement of the utility model, the cylinder bottom is integrally connected to the rear baffle; the rod head is integrally connected to the front baffle; the welding points can be eliminated to avoid cracking of the welding points;

[0009] In summary, the utility model has not only a relatively simple structure and is easy to manufacture, but also has good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the front view of the existing monorail crane brake cylinder.

[0011] Figure 2 It is the front view of the embodiment of the utility model.

[0012] Figure 3 The hydraulic principle diagram of the embodiment of the utility model. DETAILED DESCRIPTION

[0013] The utility model will be further described in detail below in conjunction with the accompanying drawings.

[0014] like Figures 2 to 3 As shown, a monorail crane brake oil cylinder of this embodiment comprises a connected cylinder bottom 1 and cylinder barrel 2, a guide sleeve 3, an integrally connected piston rod 4 and a piston 5, the cylinder bottom 1 is integrally fixedly connected with a rear baffle 6, the cylinder bottom 1 is provided with a rodless chamber oil circuit 7, the front end of the piston rod 4 is connected with a rod head 8, the rod head 8 is integrally fixedly connected with a front baffle 9 and is provided with a rod chamber oil circuit 10, a brake spring 11 is disposed on the outer sleeve of the cylinder barrel 2 between the front baffle 9 and the rear baffle 6; a stepped hole 12 is provided in the piston rod 4, the front end of the stepped hole 12 is connected to the rod chamber oil circuit 10, an oil replenishment one-way valve seat 13 is provided in the rear section of the stepped hole 12, a positioning sleeve 17 is provided in the stepped hole 12 on the rear side of the oil replenishment one-way valve seat 13, and the oil replenishment one-way valve seat 13 is provided with a positioning sleeve 17. A valve core 14 cooperating with its sealing surface is provided in the inner cavity of the seat 13, a pilot oil chamber 15 located on the front side of its sealing surface and outside the valve core 14 is provided in the inner cavity of the oil replenishment one-way valve seat 13, a return spring 16 is provided between the valve core 14 and the end face of the stepped hole, a positioning sleeve 17 is connected to the piston 5 through several radial cylindrical pins 18, and a support ring 19 is provided on the radial outer side of the cylindrical pin 18; an oil passage 20 connecting the stepped hole 12 and the front end face of the piston 5 is provided in the front section of the piston 5, and a one-way valve group 21 is provided in the oil passage 20; an axial oil groove 22 is provided on the outer circle of the front section of the piston 5, and the piston 5 and the oil replenishment one-way valve seat 13 are provided with radial oil holes 23 connecting the oil groove 22 and the pilot oil chamber 15.

[0015] When in use: the rodless chamber oil circuit 7 is connected to the oil tank; when the rod chamber oil circuit 10 flows into oil, the oil enters the stepped hole 12 in the piston rod 4 to close the valve core 14, and the oil pushes the one-way valve group 21 through the oil circuit 20 to push the piston rod 4 back, and the brake spring 11 plays a damping role at this time; when the rod chamber oil circuit 10 is cut off and connected to the oil return port, the piston rod 3 extends under the action of the brake spring 11 and generates a certain pressure in the rod chamber of the cylinder 2, and the one-way valve group 21 is closed at this time, and the oil pressure in the rod chamber acts on the pilot oil chamber 15 through the oil groove 22 and the radial oil hole 23, pushing the valve core 14, and the oil in the rod chamber flows back to the oil tank through the inner cavity of the oil replenishment one-way valve seat 13, the inner hole of the positioning sleeve 17, the rodless chamber, and the rodless chamber oil circuit 7;

[0016] The utility model cancels the original one-way valve seat, sets the one-way valve group 21 in the piston 5, and does not need to set a seal. In addition, it is connected with the pilot oil chamber 15 through the oil groove 22 and the radial oil hole 23, and does not need other process holes and sealing welding points. The positioning sleeve 17 is connected with the piston rod 4 through the cylindrical pin 18, and there is no threaded connection. The support ring 19 can prevent the cylindrical pin 18 from withdrawing. Not only is the structure relatively simple, but also it is easy to process and manufacture. Even if the brake spring 11 generates considerable vibration during operation, it has good reliability because there is no welding cracking point and thread loosening.

[0017] The present invention is not limited to the above-mentioned embodiments. For example, the positioning sleeve 17 and the piston rod 4 may also be connected via a plurality of radial set screws, which can also improve reliability.

Claims

1. A brake oil cylinder for a monorail crane, comprising a cylinder bottom and a cylinder barrel connected together, a guide sleeve, a piston rod and a piston connected in one piece, a rear baffle fixedly connected to the cylinder bottom, a rodless chamber oil circuit provided at the cylinder bottom, a rod head connected to the front end of the piston rod, the rod head fixedly connected to the front baffle and provided with a rod chamber oil circuit, a brake spring is provided on the cylinder barrel outer sleeve between the front baffle and the rear baffle, a stepped hole is provided in the piston rod, the front end of the stepped hole is connected to the rod chamber oil circuit, an oil replenishment one-way valve seat is provided in the rear section of the stepped hole, a positioning sleeve connected to the piston is provided at the rear side of the oil replenishment one-way valve seat, a valve core matched with its sealing surface is provided in the inner cavity of the oil replenishment one-way valve seat, a pilot oil chamber located on the side of its sealing surface and outside the valve core is provided in the inner cavity of the oil replenishment one-way valve seat, and a return spring is provided between the valve core and the end face of the stepped hole; it is characterized in that: An oil circuit connecting the stepped hole and the front end surface of the piston is provided in the front section of the piston, and a one-way valve group is provided in the oil circuit; an axial oil groove is provided on the outer circle of the front section of the piston, and the piston and the oil replenishing one-way valve seat are provided with radial oil holes connecting the oil groove and the pilot oil chamber.

2. The monorail crane brake cylinder according to claim 1, characterized in that: The positioning sleeve is placed in the stepped hole on the rear side of the oil replenishing one-way valve seat, and the positioning sleeve is connected to the piston through a plurality of radial cylindrical pins, and a support ring is provided on the radial outer side of the cylindrical pins.

3. A monorail crane brake cylinder according to claim 1 or 2, characterized in that: The positioning sleeve is placed in the stepped hole at the rear side of the oil replenishing one-way valve seat, and the positioning sleeve is connected to the piston through a plurality of radial set screws.

4. The monorail crane brake cylinder according to claim 1, characterized in that: The cylinder bottom is integrally connected to the rear baffle; the rod head is integrally connected to the front baffle.

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