Anti-rotation inner guide oil cylinder of casting machine

Abstract

The anti-rotation inner guide oil cylinder of the casting machine comprises a cylinder body, a piston rod and a piston, a fixing hole is formed in the position, located in the center of one side of the cylinder body, of a rear end cover, a guide rod is fixedly connected into the fixing hole, and the cross section of the guide rod is in a drum shape; a through hole consistent with the cross section of the guide rod is formed in the center of the piston, the guide rod is slidably connected into the through hole of the piston, the other end of the guide rod is fixedly connected with a guide plate, the diameter of the guide plate is slightly smaller than the inner diameter of the piston rod, and a plurality of centering mechanisms are arranged on the outer side of the guide plate. And the centering mechanism is in contact with the inner wall of the piston rod. According to the oil cylinder, the piston and the piston rod can be effectively prevented from rotating in the lifting process through the guide rod, the guide rod is always located in the coaxial center position of the cylinder body through the centering mechanism, and the situation that the piston inclines and is stuck due to unstable oil pressure in the operation process is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic cylinders, and in particular relates to an anti-rotation inner oil guide cylinder for a casting machine. Background Art

[0002] The oil cylinder is mainly composed of basic components such as cylinder barrel, cylinder head, piston, piston rod, sealing device, buffer device and exhaust device. These components are precisely processed and assembled to ensure that the hydraulic cylinder can achieve high-precision motion control. In actual applications, the piston rod will rotate after the oil cylinder makes a long-term reciprocating motion, causing the earring connected to the piston rod to withdraw after a period of use, resulting in poor connection stability. In addition, the frequently rotating piston rod will cause damage to the dynamic seal and dustproof seal in the oil cylinder, causing the oil cylinder to leak. Therefore, frequent maintenance is required, affecting work efficiency and posing great safety hazards. In some working environments, the oil cylinder needs to be positioned circumferentially, that is, the piston rod cannot rotate circumferentially during the working process, so the anti-rotation of the piston rod becomes particularly important.

[0003] Existing piston rod anti-rotation cylinders are divided into two types: external guide type and internal guide type. The external guide type adds an anti-rotation device to the outside of the cylinder to prevent the piston rod from rotating under the control of external force. However, this method is difficult to install in occasions with limited installation space and has great limitations. The internal guide type adds a guide rod inside the cylinder to limit the rotation of the piston rod during the extension and retraction process through an eccentric or special-shaped guide rod.

[0004] The existing patent with the announcement number "CN 219865708 U" discloses "a new type of hydraulic cylinder capable of preventing the piston rod from rotating". A screw for screw connection is processed in the middle of the right rod end of the guide rod of the cylinder. The guide rod enters the oil chamber from the circular entrance of the cylinder body and is fastened to the bolt hole on the right wall of the oil chamber through the screw. A guide keyway is cut on the side wall of the guide rod. A hollow sleeve hole is processed in the middle of the right rod end of the piston rod. A flat key is fastened with bolts on the right wall of the piston rod. The right rod end of the piston rod with the piston sleeved enters the oil chamber from the circular entrance of the cylinder body. The sleeve hole of the piston rod can be inserted into the guide rod and the bottom of the flat key fastened to the right wall of the piston rod can be embedded in the guide keyway of the side wall of the guide rod. The guide rod, the guide keyway on the side wall of the guide rod and the flat key are combined to form a linear guide mechanism. The piston rod of the cylinder will not rotate axially when extending / retracting, and it omits the link of installing an anti-rotation rod on the outside of the piston rod, thereby saving space.

[0005] The oil cylinder has a keyway on the guide rod and adds a flat key on the inner side of the piston rod sleeved outside the guide rod, so that the flat key slides in the guide groove to prevent rotation. However, the flat key arranged inside increases the difficulty for the workers during installation, and it is not easy to repair the flat key when it is damaged. In addition, the one-sided guide groove will cause eccentricity in actual work, causing the piston rod to be skewed and stuck, and increasing the wear of the piston rod. Therefore, frequent maintenance and replacement of parts are required, which directly affects the working efficiency of the oil cylinder. Summary of the invention

[0006] The present invention aims to provide an anti-rotation inner-guide oil cylinder for a casting machine, so as to solve the problem that the piston rod of the existing inner-guide oil cylinder is easily worn and skewed during use, resulting in the need for frequent maintenance and affecting the working efficiency of the cylinder.

[0007] The cam is an axially parallel pipe that is formed on the bottom of the cylinder and is connected with the piston rod at the bottom of the cylinder to form an axially parallel pipe connecting the piston rod and the piston rod.

[0008] The working principle of this scheme is as follows: when in use, the hydraulic oil enters the cylinder through the oil hole, and as the amount of oil increases, the piston at the bottom of the cylinder is lifted up, and the piston drives the piston rod to rise along the cylinder together. A guide rod runs through the center of the piston, and the piston also slides along the outside of the guide rod during the rising process. Because the guide rod is drum-shaped, the rotation direction of the piston is limited during the movement of the piston to prevent the piston from rotating. The guide plate at the top of the guide rod remains in the same position during the rising process of the piston rod, and the inner wall of the piston rod contacts with multiple centering mechanisms around the guide plate. Because the guide rod is long, the guide rod is prone to tilt during the lifting and lowering of the piston. The centering mechanism can always keep the guide rod in the center position, and the auxiliary piston always remains coaxial with the cylinder during the lifting process to prevent the piston from tilting during movement.

[0009] Beneficial effects: 1. The oil cylinder can effectively prevent the piston and the piston rod from rotating during the lifting process through the drum-shaped guide rod and the piston matched with the drum-shaped guide rod;

[0010] 2. The centering mechanism of the guide plate and the side wall of the guide plate can effectively assist the longer guide rod to always be located at the center position of the cylinder body, so that the piston is always in the center position when it moves, reducing the occurrence of piston tilting and jamming due to unstable oil pressure during operation;

[0011] 3. The centering mechanism contacts the inner wall of the piston rod and is slidably connected with the inner wall, which can effectively assist the sliding of the piston rod and reduce the wear of the piston rod during the lifting process;

[0012] 4. The removable rear end cover facilitates the maintenance of the cylinder and the replacement of internal parts

[0013] 5. When the piston moves to the uppermost end of the guide rod, the guide plate prevents the piston from separating from the guide rod, thereby limiting the movement position of the piston.

[0014] Furthermore, the centering mechanism includes a ball and a spring, the outer wall of the guide plate is provided with a plurality of grooves, the spring is fixedly connected to the bottom of the groove, the ball contacts the top of the spring, the groove is slightly smaller than the ball near the outer side, and the end of the ball away from the spring is higher than the side wall of the guide plate. When the piston rod slides, if an offset occurs, the side wall on one side of the piston rod will compress the ball and the spring, while the other side will be away from the ball. The ball and the spring can prevent the guide plate and the guide rod from deviating from the center position under the sliding of the piston rod, thereby causing the piston to tilt and jam during movement. Since the diameter of the ball is larger than the groove near the outer side, the ball can contact the external piston rod but will not be separated from the inside of the groove. Therefore, when the piston rod slides, the ball can also roll with it, which plays an auxiliary role in the sliding of the piston rod, making the sliding of the piston rod smoother and reducing the friction of the piston rod.

[0015] Furthermore, the cylinder body is divided into an upper cylinder body and a lower cylinder body, and the upper cylinder body and the lower cylinder body are detachably connected by fasteners. The inner diameter of the end of the upper cylinder body away from the lower cylinder body is consistent with the inner diameter of the piston rod, and the inner diameter of the end close to the lower cylinder body is consistent with the inner diameter of the lower cylinder body. The top of the lower cylinder body is higher than the top of the guide rod, and the guide plate is located in the upper cylinder body. The inner diameter of the upper cylinder body is consistent with the outer diameter of the piston rod, which can guide the piston rod when the piston rod extends out of the lower cylinder body, strengthen the lifting of the piston rod, and prevent the piston rod from bending and deforming due to excessive length when it is extended.

[0016] Furthermore, one end of the piston rod extending out of the cylinder body is fixedly connected to a connecting column, which has the same diameter as the piston rod and is slidably connected to the upper cylinder body, and one end of the connecting column away from the piston rod is fixedly connected to an end cap, which has a plurality of threaded holes near the periphery. The end cap and the connecting column facilitate the connection and use of the piston rod with an external machine.

[0017] Furthermore, the side wall of the connecting column is provided with an exhaust plug, which is connected to the inside of the cylinder body. When in use, air may infiltrate the oil, and if the air remains in the oil cylinder, it will affect the normal operation of the oil cylinder. The setting of the exhaust plug can ensure that the air can be discharged smoothly, thereby avoiding the adverse effects of air on the hydraulic system.

[0018] Furthermore, the side wall of the upper cylinder body is fixedly connected with a plurality of mounting plates, and the plurality of mounting plates are provided with mounting holes. The mounting plates facilitate the installation of the oil cylinder and external equipment, and facilitate the fixing of the oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an anti-rotation inner oil guide cylinder of a casting machine of the present invention;

[0020] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 for Figure 1 Cross-section along BB. DETAILED DESCRIPTION

[0022] The following is further described in detail through specific implementation methods:

[0023] The figure marks in the drawings of the specification include: end cover 1, connecting column 2, mounting plate 3, upper cylinder body 4, oil hole 5, lower cylinder body 6, piston rod 7, piston 8, rear end cover 9, guide rod 10, centering mechanism 11, ball 112, spring 113, guide plate 12, exhaust plug 13.

[0024] The embodiment is basically as shown in the attached Figure 1 to Figure 3As shown: an anti-rotation inner oil guide cylinder of a casting machine, comprising an upper cylinder body 4, a lower cylinder body 6, a piston rod 7 and a piston 8. The upper cylinder body 4 and the lower cylinder body 6 are detachably connected by fasteners. An oil hole 5 is provided at a position of the upper cylinder body 4 near the lower cylinder body 6. The inner diameter of one end of the upper cylinder body 4 near the lower cylinder body 6 is the same as that of the lower cylinder body 6. The inner diameter of one end of the upper cylinder body 4 away from the lower cylinder body 6 is slightly smaller than the inner diameter of the lower cylinder body 6. The end of the lower cylinder body 6 away from the upper cylinder body 4 is fixedly connected with a rear end cover 9. Two mounting plates 3 are fixedly connected to the periphery of the upper cylinder body 4. The mounting plates 3 are symmetrical to each other. Both mounting plates 3 are provided with mounting holes. The piston rod 7 is slidably connected to the upper cylinder body 4. The interior of the upper cylinder body 4 and the lower cylinder body 6, the interior of the piston rod 7 is hollow, and the outer diameter of the piston rod 7 is consistent with the smaller inner diameter of the upper cylinder body 4, the end of the piston rod 7 close to the rear end cover 9 is fixedly connected to the piston 8, the outer diameter of the piston 8 is consistent with the inner diameter of the lower cylinder body 6, the rear end cover 9 is located at the center of one side of the lower cylinder body 6. A fixing hole is opened, and a guide rod 10 is fixedly connected in the fixing hole. The cross section of the guide rod 10 is drum-shaped. A through hole with the same cross section as the guide rod 10 is opened in the center of the piston 8. The guide rod 10 passes through the through hole of the piston 8 and is slidably connected to the piston 8. The top end of the guide rod 10 extends to be flush with the top end of the lower cylinder body 6;

[0025] The end of the guide rod 10 away from the piston 8 is fixedly connected to a guide plate 12, and the outer wall of the guide plate 12 is provided with four grooves in a circular array. A spring 113 is fixedly connected to the bottom of the groove, and a ball 112 is provided at the top of the spring 113. The position of the groove near the top is slightly smaller than the ball 112, and the ball 112 can slide in the groove. When the ball 112 is lifted by the spring 113, the top of the ball 112 can extend out of the groove and contact the inner wall of the piston rod 7;

[0026] One end of the piston rod 7 away from the rear end cover 9 extends out of the upper cylinder body 4 and is fixedly connected to a connecting column 2. The side wall of the connecting column 2 is provided with an exhaust plug 13, and the exhaust plug 13 is connected to the interior of the cylinder body. The end of the connecting column 2 away from the piston rod 7 is fixedly connected to the end cover 1, and a plurality of threaded holes are opened near the periphery of the end cover 1.

[0027] The specific implementation process is as follows: when in use, the hydraulic oil is introduced into the upper cylinder body 4 and the lower cylinder body 6 from the oil hole 5, and the piston 8 and the piston rod 7 are lifted up and away from the rear end cover 9. Because the guide rod 10 passes through the center of the piston 8, the piston 8 is prevented from rotating under the guidance of the fixed guide rod 10. The centering mechanism 11 around the guide plate 12 at the top of the guide rod 10 compresses or relaxes the inside of the piston rod 7 relative to the ball 112 when the piston rod 7 is offset, so that the guide rod 10 can avoid being offset due to the offset of the piston rod 7, so that the piston rod 7 is always in the coaxial center of the cylinder body, and the piston 8 is prevented from being skewed and stuck due to the offset of the guide rod 10 when it moves. Moreover, because the ball 112 can rotate freely in the groove, when the piston rod 7 slides, the freely rolling ball 112 is equivalent to a pulley, which can assist the movement of the piston rod 7 and reduce the wear of the piston rod 7. The guide plate 12 also limits the lifting position of the piston 8 to prevent the piston 8 from leaving the stroke of the guide rod 10.

[0028] The upper cylinder body 4 can guide the piston rod 7 when the piston rod 7 is extended too long, thereby preventing the piston rod 7 from bending due to excessive extension; the end cover 1 and the mounting plate 3 can be connected to external equipment, which is convenient for the installation and use of the cylinder.

[0029] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An anti-rotation inner oil guide cylinder for a casting machine, comprising a cylinder body, a piston rod and a piston, wherein the side wall of the cylinder body is provided with an oil hole, the bottom of the cylinder body is detachably connected with a rear end cover, the piston rod is sleeved in the cylinder body and is coaxially slidably connected with the cylinder body, the end of the piston rod away from the rear end cover extends out of the cylinder body, the piston rod is hollow inside, the piston is fixedly connected to the end of the piston rod close to the rear end cover, and is slidably connected with the cylinder body, characterized in that: The rear end cover is provided with a fixing hole at the center of one side of the cylinder body, and a guide rod is fixedly connected in the fixing hole. The cross-section of the guide rod is drum-shaped. A through hole consistent with the cross-section of the guide rod is provided in the center of the piston. The guide rod is slidably connected to the through hole of the piston. The other end of the guide rod is fixedly connected to a guide plate. The diameter of the guide plate is slightly smaller than the inner diameter of the piston rod. A plurality of centering mechanisms are provided on the outer side of the guide plate, and the centering mechanisms are in contact with the inner wall of the piston rod.

2. The anti-rotation inner oil guide cylinder of a casting machine according to claim 1, characterized in that: The centering mechanism includes a ball and a spring. The outer wall of the guide plate is provided with a plurality of grooves. The spring is fixedly connected to the bottom of the groove. The ball contacts the top of the spring. The position of the groove close to the outside is slightly smaller than the ball, and the end of the ball away from the spring is higher than the side wall of the guide plate.

3. The anti-rotation inner oil guide cylinder of a casting machine according to claim 2, characterized in that: The cylinder body is divided into an upper cylinder body and a lower cylinder body, and the upper cylinder body and the lower cylinder body are detachably connected by fasteners. The inner diameter of the end of the upper cylinder body away from the lower cylinder body is consistent with the inner diameter of the piston rod, and the inner diameter of the end close to the lower cylinder body is consistent with the inner diameter of the lower cylinder body. The top end of the lower cylinder body is higher than the top end of the guide rod, and the guide plate is located in the upper cylinder body.

4. The anti-rotation inner oil guide cylinder of a casting machine according to claim 3, characterized in that: One end of the piston rod extending out of the cylinder body is fixedly connected to a connecting column, the connecting column has the same diameter as the piston rod and is slidably connected to the upper cylinder body, and the end of the connecting column away from the piston rod is fixedly connected to an end cover, and a plurality of threaded holes are opened near the periphery of the end cover.

5. The anti-rotation inner oil guide cylinder of a casting machine according to claim 4, characterized in that: The side wall of the connecting column is provided with an exhaust plug, and the exhaust plug is communicated with the inside of the cylinder body.

6. The anti-rotation inner oil guide cylinder of a casting machine according to claim 5, characterized in that: A plurality of mounting plates are fixedly connected to the side wall of the upper cylinder body, and each of the plurality of mounting plates is provided with mounting holes.

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