CN204327649U - Oil hydraulic cylinder bearing pin - Google Patents

Abstract

The utility model discloses a pin shaft of a hydraulic cylinder, which relates to the technical field of hydraulic cylinder manufacturing, and comprises a pin body provided with a limiting plate and a large-diameter shaft section and a small-diameter shaft section sequentially connected to the limiting plate, and the pin body Fix the piston rod of the hydraulic cylinder on the first support and the second support by passing through the first support hole, the piston rod head hole and the second support hole in sequence; the pin shaft body is sleeved on its small diameter shaft section The first shaft sleeve matched with the second support hole is provided with a middle-diameter shaft section between the large-diameter shaft section and the small-diameter shaft section of the pin shaft body. The rod head holes are matched; an oil groove is arranged on the outer edge of the middle diameter shaft section of the pin body, and the oil groove communicates with the oil nipple located on the limit plate of the pin body through the oil hole. Compared with the prior art, the utility model avoids the phenomenon that the pin shaft body is easy to wear out bosses on the small-diameter shaft section after being used for a period of time; it is convenient to disassemble and install the pin shaft body during maintenance.

Description

Hydraulic cylinder pin

technical field

The utility model relates to the technical field of hydraulic cylinder manufacturing, in particular to a pin shaft of a hydraulic cylinder which is convenient for installation and disassembly.

Background technique

The vertical mill integrates crushing, drying, grinding, and grading transportation. It can grind block, granular, and powdery raw materials into required powdery materials. It is widely used in cement, electric power, metallurgy, chemical industry, and non-metallic mines. and other industries. The grinding roller of the vertical mill is connected with the hydraulic cylinder through the pressure bracket, and the hydraulic cylinder controls the pressure of the grinding roller during the operation of the vertical mill. The piston rod head of the hydraulic cylinder is installed on the two supports of the pressure bracket through the pin shaft. Between the seats, the pin plays an important role in connecting and transmitting loads. At present, the hydraulic cylinder pin shown in Figure 1 is often used. The hydraulic cylinder pin includes a pin body 22 provided with a limiting plate and a large-diameter shaft section and a small-diameter shaft section sequentially connected to the limiting plate. The pin body 22 fixes the hydraulic cylinder piston rod 24 on the first support 23 and the second support 26 by sequentially passing through the first support hole, the piston rod head hole and the second support hole; the pin body 22 The large-diameter shaft section of the pin shaft matches with the first bearing hole, and the pin shaft body 22 is sequentially fitted with a joint bearing 25 matching with the piston rod head hole and a shaft matching with the second bearing hole on the small-diameter shaft section. Sleeve 27; the limit plate of the pin shaft body 22 is fixed on the first support 23 by bolts 21, and a backing plate 28 and a lock nut 29 are installed at the position where the pin shaft body 22 passes through the second support 26 . This hydraulic cylinder pin has the following deficiencies in the production process: 1. Due to the frequent movements of the hydraulic cylinder and the vibration of the grinding rollers of the vertical mill, the mating surface between the small-diameter shaft section of the pin body and the joint bearing is easily worn, causing the pin to wear. The shaft body wears a boss at the joint A of the joint bearing and the bushing, which makes it difficult to disassemble the pin shaft of the hydraulic cylinder. It can only be removed by flame cutting, thereby damaging the piston rod, joint bearing, bushing and other parts, and it takes 4 It takes ~5 working days to complete the replacement of the pin shaft of the hydraulic cylinder; 2. Affected by the vibration of the grinding roller, the bolts connecting the limit plate and the first support are easy to loosen or even break, and the limit plate of the pin body and the first support The friction of the contact surface of the support increases. Since the material of the pin shaft body is stronger than the material of the first support, the surface of the inner hole of the first support is seriously damaged, and the first support and the pressurized support are of an integral structure, so that Replacing the pressurized bracket requires high maintenance costs and high production costs.

Utility model content

The technical problem to be solved by the utility model is to provide a pin shaft of a hydraulic cylinder, so as to solve the problem that the existing pin body easily wears out bosses on its small-diameter shaft section after a period of use, making it difficult to disassemble.

In order to solve the above-mentioned problems, the technical solution adopted by the utility model is: the pin shaft of this hydraulic cylinder includes a pin body provided with a limiting plate and a large-diameter shaft section and a small-diameter shaft section sequentially connected to the limiting plate. The pin shaft body fixes the piston rod of the hydraulic cylinder on the first support and the second support by sequentially passing through the first support hole, the piston rod head hole and the second support hole; The small-diameter shaft section is fitted with a first sleeve matching the second support hole, and a middle-diameter shaft section is provided between the large-diameter shaft section and the small-diameter shaft section of the pin body. The body matches the hole of the piston rod head through the spherical joint bearing set in the middle diameter shaft section; an oil groove is opened on the outer edge of the middle diameter shaft section of the pin body, and the oil groove is connected with the pin on the middle diameter shaft through the oil hole. The oil nipple on the limit plate of the shaft body is connected.

In the above-mentioned hydraulic cylinder pin technical solution, a more specific technical solution may also be: a second bushing matched with the first bearing hole is fitted on the large-diameter shaft section of the pin body; The limiting plate of the pin shaft body is fixedly connected with the first support by bolts.

Further, the joint between the medium-diameter shaft section and the small-diameter shaft section of the pin body is located in the joint bearing hole.

Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

1. The utility model is provided with a middle-diameter shaft section between the large-diameter shaft section and the small-diameter shaft section of the pin shaft body, and the joint bearing of the pin shaft body fitted with the middle-diameter shaft section is matched with the head hole of the piston rod; There is an oil groove on the outer edge of the middle diameter shaft section of the shaft body, and the oil groove communicates with the oil nipple arranged on the limit plate of the pin shaft body through the oil hole. Since the joint bearing is set on the middle-diameter shaft section of the pin shaft body, it avoids the phenomenon that the pin shaft body is easy to wear out the boss on the small-diameter shaft section after a period of use; it is convenient to disassemble and install the pin shaft body during maintenance. It takes 2 working days to complete and can be disassembled without damaging the parts. Lubricating oil is delivered to the oil groove through the oil hole, so that the contact surface of the joint bearing and the pin shaft body is lubricated, and the service life of the pin shaft body is prolonged.

2. On the large-diameter shaft section of the pin shaft body, a second bushing matching the first bearing hole is fitted; to protect the first bearing hole from wear, if the second bushing is worn, it can be replaced to avoid Replacement of pressurized brackets reduces maintenance costs and lowers production costs.

Description of drawings

Fig. 1 is a structural schematic diagram of a conventional hydraulic cylinder pin.

Fig. 2 is a schematic structural view of an embodiment of the utility model.

Fig. 3 is a schematic structural view of the pin body of the embodiment of the utility model.

Detailed ways

Below in conjunction with accompanying drawing embodiment the utility model is described in further detail:

A hydraulic cylinder pin as shown in Fig. 2 and Fig. 3 includes a pin body 2 provided with a limiting plate and a large-diameter shaft section and a small-diameter shaft section sequentially connected to the limiting plate, and the pin body 2 passes through the Fix the hydraulic cylinder piston rod 4 on the first support 3 and the second support 6 through the first support hole, the piston rod head hole and the second support hole in turn, and pass through the second support 6 A backing plate 8 and a lock nut 9 are installed at the center; the pin shaft body 2 is fitted with a first sleeve 7 matching the hole of the second support on its small-diameter shaft section, and the first sleeve 7 protrudes from the second support 6; the middle-diameter shaft section is connected between the large-diameter shaft section and the small-diameter shaft section of the pin shaft body 2, and the pin shaft body 2 cooperates with the piston rod head hole through the joint bearing 5 set by the middle-diameter shaft section , one end surface of the joint bearing 5 offsets the large-diameter shaft section, and the other end surface protrudes from the middle-diameter shaft section to offset the first bushing 7; the joint between the middle-diameter shaft section and the small-diameter shaft section of the pin body 2 is located in the joint bearing hole Inside; on the large-diameter shaft section of the pin shaft body 2, the second bushing 10 matched with the first bearing hole is set, and the inner holes and outer circles at both ends of the first bushing 7 and the second bushing 10 are set There is a 3×3 chamfer; the limit plate of the pin shaft body 2 is fixedly connected with the first support 3 through the bolt 1, and an oil groove is opened on the outer edge of the middle diameter shaft section of the pin shaft body 2, and the oil groove passes through the oil hole and the mounting The oil nipple 11 on the limit plate of the pin body 2 communicates.

The joint bearing 5 of the utility model is set on the medium-diameter shaft section of the pin shaft body 2, which avoids the phenomenon that the pin shaft body 2 is easy to wear out the boss on the small-diameter shaft section after a period of use; the pin shaft is disassembled and installed during maintenance The body 2 is convenient, it only takes 2 working days to complete, and the parts will not be damaged when disassembled. Lubricating oil is delivered to the oil groove through the oil hole, so that the contact surface of the joint bearing and the pin shaft body is lubricated, and the service life of the pin shaft body is prolonged.

Claims (3)

1. an oil hydraulic cylinder bearing pin, comprise the pin body (2) of large footpath shaft part and the path shaft part being provided with limiting board and be attached at successively on this limiting board, described pin body (2) is by being fixed on hydraulic cylinder piston rod (4) on the first bearing (3) and the second bearing (6) through the first bearing hole, piston rod head hole and the second bearing hole successively; Described pin body (2) is set with the first axle sleeve (7) matched with described second bearing hole on its path shaft part, it is characterized in that: between the large footpath shaft part and path shaft part of described pin body (2), be provided with central diameter shaft part, described pin body (2) is matched with described piston rod head hole by the joint shaft bearing (5) that wherein footpath shaft part is set with; Have oil groove in the central diameter shaft part outer rim of described pin body (2), described oil groove is communicated with the oil nozzle (11) on the limiting board being located at described pin body (2) by oilhole.

2. oil hydraulic cylinder bearing pin according to claim 1, is characterized in that: on the large footpath shaft part of described pin body (2), be set with the second axle sleeve (10) matched with described first bearing hole; The limiting board of described pin body (2) is fixedly connected with described first bearing (3) by bolt (1).

3. oil hydraulic cylinder bearing pin according to claim 1 and 2, is characterized in that: central diameter shaft part and the path shaft part joint of described pin body (2) are positioned at described joint shaft bearing bore.