A bearing shell pressing device and a pressing method

Abstract

The present application belongs to the technical field of ball valve assembly device, and particularly relates to a bearing bush pressing device and a pressing method. The technical scheme is as follows: a bearing bush pressing device comprises a plurality of screws connected to the end face of a valve body, a presser for pressing the bearing bush into the valve body and the valve shaft is arranged on the screw, the presser is located on the side of the bearing bush away from the valve body, a transmission mechanism is arranged in the presser, the input end of the transmission mechanism is connected to an electric torque wrench, and the output end of the transmission mechanism is threadedly connected to the screw. The present application provides a bearing bush pressing device and a pressing method, and can greatly save the physical strength of workers.

Description

Technical Field

[0001] This invention belongs to the technical field of ball valve assembly devices, and specifically relates to a bearing clamping device and clamping method. Background Technology

[0002] Currently, in the ball valve assembly process, the bearing bush on the valve shaft side is installed as follows: four long screws are installed on the valve body, a nut is installed on the outside of the bearing bush, and the nut is rotated with a wrench to press the bearing bush into the valve body (see...). Figure 14 , Figure 15 The heavy weight of the bearing bush and the small clearance between it and the valve body bore and valve shaft result in high frictional resistance. Furthermore, the pressing-in portion of the bearing bush is nearly 1 meter, meaning the working stroke of the nut is close to 1 meter, leading to high labor intensity for workers. Additionally, since two workers are required to simultaneously turn the nut with wrenches on opposite sides, it is difficult for them to maintain a consistent rhythm, causing the bearing bush to tilt during pressing. This prevents further pressing and necessitates frequent stops for adjustment, and may even damage the outer circumference of the bearing bush or the inner circumference of the valve body, requiring the bearing bush to be removed for repair. This results in low work efficiency. Summary of the Invention

[0003] In order to solve the above-mentioned problems in the prior art, the purpose of this invention is to provide a bearing clamping device and clamping method, which can greatly save the physical strength of workers.

[0004] The technical solution adopted in this invention is as follows:

[0005] A bearing clamping device includes several lead screws connected to the end face of a valve body. Each lead screw is equipped with a clamping device for pressing the bearing into the space between the valve body and the valve shaft. The clamping device is located on the side of the bearing away from the valve body. A transmission mechanism is installed inside the clamping device. The input end of the transmission mechanism is connected to an electric torque wrench, and the output end of the transmission mechanism is threadedly connected to the lead screws.

[0006] The lead screw is connected to the valve body, so it does not rotate. When the electric torque wrench drives the transmission mechanism, while keeping the clamp housing stationary, the transmission mechanism engages with the lead screw, causing the clamp housing to move linearly relative to the lead screw, thus pressing the bearing bush between the valve body and the valve shaft, completing the bearing bush assembly.

[0007] The bearing clamping device of the present invention is easy to install and has a simple structure. The clamping device is inserted into the screw to apply pressure to the bearing, and the electric torque wrench provides power, which greatly saves the physical strength of the workers. In addition, the two electric torque wrenches provide the same torque, which can also ensure that the bearing can move basically synchronously, avoid the misalignment of the bearing, make the pressing process smoother, and improve work efficiency.

[0008] In a preferred embodiment of the present invention, a reaction arm is connected to the clamping device, and several smooth rods are also connected to the end face of the valve body. The end of the reaction arm away from the clamping device rests against the smooth rods. The long handle of the reaction arm rests against the smooth rods to counteract the torque acting on the housing, preventing the housing from rotating and keeping the clamping device in a fixed position. By setting up the reaction arm and smooth rods, manual maintenance of the housing to prevent rotation can be avoided, achieving the purpose of saving effort.

[0009] As a preferred embodiment of the present invention, the clamping device includes a housing, and the transmission mechanism includes a driving bevel gear and a driven bevel gear. The driving bevel gear meshes with the driven bevel gear. The shafts of both the driving bevel gear and the driven bevel gear are rotatably connected within the housing. The shaft of the driving bevel gear is connected to the output end of an electric torque wrench, and the shaft of the driven bevel gear is threadedly connected to a lead screw. A pressure head for clamping the bearing is connected to the driven bevel gear.

[0010] When the electric torque wrench drives the driving bevel gear to rotate, the driving bevel gear drives the driven bevel gear to rotate. Since neither the lead screw nor the housing rotates, the entire clamping device moves linearly relative to the lead screw. The pressure head on the clamping device pushes the bearing to move, pressing the bearing between the valve body and the valve shaft.

[0011] In a preferred embodiment of the present invention, the shaft of the active bevel bearing is connected to the housing via a ball bearing; the shaft of the passive bevel gear is connected to the housing via an angular contact bearing, and a pressure ring is mounted on the housing to press against the end face of the angular contact bearing. The shaft of the passive bevel gear is mounted inside the housing via a pair of back-to-back angular contact bearings and is pre-tightened by the pressure ring. The angular contact bearing can withstand axial and radial forces.

[0012] In a preferred embodiment of the present invention, a support cover is connected to the housing, and a copper sleeve is installed inside the support cover, with the lead screw sleeved inside the copper sleeve. The copper sleeve inside the support cover, with its inner circle fitting with the outer circle of the lead screw, can improve the stress distribution on the clamping device.

[0013] In a preferred embodiment of the present invention, the housing is provided with a spline structure, and one end of the reaction arm is provided with a spline groove, the spline structure and the spline groove cooperating; the housing is provided with a limiting structure for blocking the reaction arm, the limiting structure being located on the side of the reaction arm away from the bearing bush. To prevent the reaction force during the clamping process from causing the housing to rotate, an 18-sided spline structure is designed on the housing, which cooperates with the spline groove at one end of the reaction arm. The limiting structure on the housing causes the reaction arm to move along the lead screw along with the clamping device.

[0014] In a preferred embodiment of the present invention, a rolling bearing is installed at the end of the reaction arm away from the clamping device, and the polished rod contacts the rolling bearing. The rolling bearing is installed at the point where the long shank of the reaction arm contacts the polished rod to reduce friction between the reaction arm and the polished rod and improve transmission efficiency.

[0015] As a preferred embodiment of the present invention, the present invention further includes an anti-torsion bracket, wherein a plurality of lead rods and a plurality of guide rods are connected to the anti-torsion bracket. During the bearing clamping process, the force acting on the lead rods and guide rods will cause them to bend. In order to ensure the straightness of the guide rods and lead rods, anti-torsion brackets are installed at the ends of the guide rods and lead rods to increase their rigidity.

[0016] In a preferred embodiment of the present invention, several lead screws are arranged in pairs, with each pair of lead screws arranged at 180° to the center of the bearing bush. During bearing bush pressing, an operator stands on each side of the bearing bush, places the power head of an electric torque wrench onto the hexagonal drive bevel gear of the clamping device, places the reaction arm of the torque wrench on the housing of the clamping device, and simultaneously activates the wrench. Using electric torque wrenches of the same model with the same torque ensures synchronized movement of the clamping devices on both sides, significantly reducing the probability of wear and tear between the bearing bush and the valve body.

[0017] A method for clamping bearing bushes includes the following steps:

[0018] S1: Insert the bearing bush into a small section of the valve shaft and adjust the flange plane of the bearing bush to be parallel to the valve body plane;

[0019] S2: Screw in the lead screw and polished rod on the end face of the valve body;

[0020] S3: First, put the reaction arm into the screw, then screw the clamping device into the screw, then put the reaction arm into the spline structure of the clamping device, and use a torque wrench to rotate the driving bevel gear to make the clamping device fit tightly against the bearing.

[0021] S4: Install the anti-torsion bracket on the lead screw and the guide rod;

[0022] S5: An operator stands on each side of the bearing bush, places the power head of the electric torque wrench on the hexagon of the driving bevel gear of the clamp, places the reaction arm of the electric torque wrench on the housing of the clamp, and starts the wrench at the same time.

[0023] The beneficial effects of this invention are as follows:

[0024] The bearing clamping device of the present invention is easy to install and has a simple structure. The clamping device is inserted into the screw to apply pressure to the bearing, and the electric torque wrench provides power, which greatly saves the physical strength of the workers. In addition, the two electric torque wrenches provide the same torque, which can also ensure that the bearing can move basically synchronously, avoid the misalignment of the bearing, make the pressing process smoother, and improve work efficiency. Attached Figure Description

[0025] Figure 1 This is the front view of the assembly drawing of the present invention;

[0026] Figure 2This is the right view of the assembly drawing of the present invention;

[0027] Figure 3 This is the front view of the present invention;

[0028] Figure 4 This is the right view of the present invention;

[0029] Figure 5 It is an assembly drawing of the clamping device and the reaction arm;

[0030] Figure 6 This is the front view of the clamp;

[0031] Figure 7 This is the right view of the clamp;

[0032] Figure 8 This is a cross-sectional view of the clamp;

[0033] Figure 9 This is a cross-sectional view of the shell;

[0034] Figure 10 This is a schematic diagram of the inverse proportional arm;

[0035] Figure 11 This is a cross-sectional view of the reaction arm section structure;

[0036] Figure 12 This is a schematic diagram of the lead screw structure;

[0037] Figure 13 This is a schematic diagram of the smooth rod structure;

[0038] Figure 14 This is a partial structural diagram of a ball valve;

[0039] Figure 15 This is a schematic diagram of the existing bearing press-fitting device.

[0040] In the diagram: 1-Valve body; 2-Valve shaft; 3-Bearing bush; 4-Screw rod; 5-Pressure device; 6-Transmission mechanism; 7-Reaction arm; 8-Smooth rod; 9-Anti-torsion bracket; 51-Housing; 52-Pressure head; 53-Ball bearing; 54-Angular contact bearing; 55-Pressure ring; 56-Support cover; 57-Copper sleeve; 58-Sealing cover; 61-Driving bevel gear; 62-Passive bevel gear; 71-Spline groove; 72-Rolling bearing; 511-Spline structure; 512-Limiting structure. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0043] like Figures 1 to 13 As shown, the bearing clamping device of this embodiment includes four screws 4 threaded to the end face of the valve body 1. Each screw 4 is provided with a clamping device 5 for pressing the bearing 3 between the valve body 1 and the valve shaft 2. The clamping device 5 is located on the side of the bearing 3 away from the valve body 1. A transmission mechanism 6 is provided inside the clamping device 5. The input end of the transmission mechanism 6 is connected to an electric torque wrench, and the output end of the transmission mechanism 6 is threaded to the screws 4.

[0044] The lead screw 4 is connected to the valve body 1, so the lead screw 4 will not rotate. When the electric torque wrench drives the transmission mechanism 6, while keeping the housing 51 of the clamping device 5 from rotating, the transmission mechanism 6 engages with the lead screw 4, so that the housing 51 of the clamping device 5 moves linearly relative to the lead screw 4, thereby pressing the bearing 3 into the space between the valve body 1 and the valve shaft 2, thus completing the assembly of the bearing 3.

[0045] The bearing clamping device of the present invention is easy to install and has a simple structure. The clamping device 5 is inserted into the screw 4 to apply pressure to the bearing 3, and the electric torque wrench provides power, which greatly saves the physical strength of the workers. In addition, the two electric torque wrenches provide the same torque, which can also ensure that the bearing 3 can move in a basically synchronous manner, avoid the misalignment of the bearing 3, make the pressing process smoother, and improve work efficiency.

[0046] Furthermore, a reaction arm 7 is connected to the clamping device 5, and four smooth rods 8 are threaded onto the end face of the valve body 1. The end of the reaction arm 7 away from the clamping device 5 rests against the smooth rods 8. The long handle of the reaction arm 7 rests against the smooth rods 8 to counteract the torque acting on the housing 51, preventing the housing 51 from rotating and keeping the clamping device 5 in a fixed position. The arrangement of the reaction arm 7 and the smooth rods 8 eliminates the need for manual maintenance to prevent the housing 51 from rotating, thus saving effort.

[0047] Specifically, the clamping device 5 includes a housing 51, and the transmission mechanism 6 includes a driving bevel gear 61 and a driven bevel gear 62. The driving bevel gear 61 meshes with the driven bevel gear 62. The shafts of the driving bevel gear and the driven bevel gear 62 are rotatably connected inside the housing 51. The shaft of the driving bevel gear 61 is connected to the output end of the electric torque wrench, and the shaft of the driven bevel gear 62 is threadedly connected to the lead screw 4. A pressure head 52 for clamping the bearing shell 3 is threadedly connected to the driven bevel gear 62.

[0048] When the electric torque wrench drives the driving bevel gear 61 to rotate, the driving bevel gear 61 drives the driven bevel gear 62 to rotate. Since neither the lead screw 4 nor the housing 51 rotates, the clamping device 5 moves linearly relative to the lead screw 4. The pressure head 52 on the clamping device 5 pushes the bearing 3 to move, pressing the bearing 3 between the valve body 1 and the valve shaft 2.

[0049] The non-meshing end of the driving bevel gear 61 has a hexagonal structure and can be engaged with the sleeve of an electric torque wrench. When the driving bevel gear 61 is rotated with the electric torque wrench, it will drive the driven bevel gear 62 to rotate together. The inner hole of the driven bevel gear 62 has a trapezoidal thread, which engages with the lead screw 4 to convert the rotational motion into linear motion, so that the clamping device 5 moves linearly along the lead screw 4.

[0050] The housing 51 is designed with mounting holes to facilitate the installation of the drive bevel gear 61. The mounting holes are sealed with a cover 58.

[0051] The active bevel bearing's shaft is connected to the housing 51 via a ball bearing 53; the passive bevel gear 62's shaft is connected to the housing 51 via an angular contact bearing 54. A pressure ring 55 is mounted on the housing 51 to press against the end face of the angular contact bearing 54. The passive bevel gear 62's shaft is mounted inside the housing 51 via a pair of back-to-back angular contact bearings 54, and is pre-tightened by the pressure ring 55. The angular contact bearings 54 can withstand axial and radial forces.

[0052] A support cover 56 is connected to the housing 51, and a copper sleeve 57 is installed inside the support cover 56. The lead screw 4 is sleeved inside the copper sleeve 57. The copper sleeve 57 is installed inside the support cover 56, and the inner circle of the copper sleeve 57 fits with the outer circle of the lead screw 4, which can improve the stress condition of the clamping device 5.

[0053] Furthermore, the housing 51 is provided with a spline structure 511, and one end of the reaction arm 7 is provided with a spline groove 71, with the spline structure 511 engaging with the spline groove 71. The housing 51 is also provided with a limiting structure 512 to block the reaction arm 7, located on the side of the reaction arm 7 away from the bearing shell 3. To prevent the reaction force during the clamping process from causing the housing 51 to rotate, an 18-sided spline structure 511 is designed on the housing 51, which engages with the spline groove 71 at one end of the reaction arm 7. The limiting structure 512 on the housing 51 causes the reaction arm 7 to move along the lead screw 4 along with the clamping device 5.

[0054] To reduce the friction between the reaction arm 7 and the guide rod 8, a rolling bearing 72 is installed at the end of the reaction arm 7 away from the clamping device 5, and the guide rod 8 contacts the rolling bearing 72. The rolling bearing 72 is installed at the point where the long handle of the reaction arm 7 contacts the guide rod 8 to reduce the friction between the reaction arm 7 and the guide rod 8 and improve transmission efficiency.

[0055] The invention also includes an anti-torsion bracket 9, to which four lead screws 4 and four guide rods 8 are connected. During the clamping process of the bearing bush 3, the force acting on the lead screws 4 and guide rods 8 will cause them to bend. In order to ensure the straightness of the guide rods 8 and lead screws 4, anti-torsion brackets 9 are installed at the ends of the guide rods 8 and lead screws 4 to increase their rigidity.

[0056] It should be noted that one lead screw 4 and one guide rod 8 form a group, totaling 4 groups, which are evenly distributed around the bearing 3 as the center along the circumference. In this embodiment, all four lead screws 4 and four guide rods 8 are evenly distributed around the bearing 3 as the center along the circumference.

[0057] When pressing the bearing shell 3, one operator stands on each side of the bearing shell 3. The power head of the electric torque wrench is placed on the hexagon of the driving bevel gear 61 of the clamping device 5, and the reaction arm of the torque wrench is placed on the housing 51 of the clamping device 5. The wrench is then activated simultaneously. Using electric torque wrenches of the same model with the same torque can keep the clamping devices 5 on both sides moving synchronously, greatly reducing the probability of damage between the bearing shell 3 and the valve body 1.

[0058] The bearing clamping method of this embodiment includes the following steps:

[0059] S1: Insert the bearing shell 3 into a small section of the valve shaft 2, and adjust the flange plane of the bearing shell 3 to be parallel to the plane of the valve body 1;

[0060] S2: Screw screw 4 and smooth rod 8 into the end face of valve body 1;

[0061] S3: First, put the reaction arm 7 into the screw 4, then screw the clamp 5 into the screw 4, and then put the reaction arm 7 into the spline structure 511 of the clamp 5. Use a torque wrench to rotate the driving bevel gear 61 so that the clamp 5 is tightly against the bearing 3.

[0062] S4: Install the anti-torsion bracket 9 onto the lead screw 4 and the guide rod 8;

[0063] S5: An operator stands on each side of the bearing 3, places the power head of the electric torque wrench on the hexagon of the driving bevel gear 61 of the clamping device 5, places the reaction arm of the electric torque wrench on the housing 51 of the clamping device 5, and starts the wrench at the same time.

[0064] Since the reaction arm of the electric torque wrench rests on the housing 51, the operator does not need to bear the reaction force generated by the torque wrench. He only needs to keep the electric torque wrench from detaching from the clamping device 5, which is very convenient and labor-saving.

[0065] Using the bearing clamping device of the present invention will greatly reduce the labor intensity of installing bearing 3 and improve work efficiency; at the same time, since the same torque wrench of the same model and the same torque setting can keep the clamping device 5 moving synchronously, the probability of bearing 3 and valve body 1 being damaged is greatly reduced.

[0066] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A bearing clamping device, characterized in that: Includes several lead screws (4) connected to the end face of the valve body (1), and a clamping device (5) for pressing the bearing (3) into the valve body (1) and the valve shaft (2) is provided on the lead screw (4). The clamping device (5) is located on the side of the bearing (3) away from the valve body (1). A transmission mechanism (6) is provided inside the clamping device (5). The input end of the transmission mechanism (6) is connected to an electric torque wrench, and the output end of the transmission mechanism (6) is threadedly connected to the lead screw (4). The clamping device (5) is connected to a reaction arm (7), and several smooth rods (8) are also connected to the end face of the valve body (1). The end of the reaction arm (7) away from the clamping device (5) rests against the smooth rod (8). The clamping device (5) includes a housing (51), and the transmission mechanism (6) includes a driving bevel gear (61) and a driven bevel gear (62). The driving bevel gear (61) meshes with the driven bevel gear (62). The shafts of the driving bevel gear and the driven bevel gear (62) are rotatably connected inside the housing (51). The shaft of the driving bevel gear (61) is connected to the output end of the electric torque wrench, and the shaft of the driven bevel gear (62) is threadedly connected to the lead screw (4). A pressure head (52) for clamping the bearing shell (3) is connected to the driven bevel gear (62). The shaft of the active bevel gear is connected to the housing (51) via a ball bearing (53); the shaft of the passive bevel gear (62) is connected to the housing (51) via an angular contact bearing (54), and a pressure ring (55) for pressing the end face of the angular contact bearing (54) is installed on the housing (51).

2. The bearing clamping device according to claim 1, characterized in that: A support cover (56) is connected to the housing (51), and a copper sleeve (57) is installed inside the support cover (56). The lead screw (4) is sleeved inside the copper sleeve (57).

3. The bearing clamping device according to claim 1, characterized in that: The housing (51) is provided with a spline structure (511), and one end of the reaction arm (7) is provided with a spline groove (71). The spline structure (511) and the spline groove (71) cooperate. The housing (51) is provided with a limiting structure (512) for blocking the reaction arm (7). The limiting structure (512) is located on the side of the reaction arm (7) away from the bearing (3).

4. The bearing clamping device according to claim 1, characterized in that: The reaction arm (7) is equipped with a rolling bearing (72) at the end away from the clamping device (5), and the smooth rod (8) is in contact with the rolling bearing (72).

5. The bearing clamping device according to claim 3, characterized in that: It also includes an anti-torsion bracket (9), and several lead screws (4) and several smooth rods (8) are all connected to the anti-torsion bracket (9).

6. The bearing clamping device according to claim 1, characterized in that: Several lead screws (4) are arranged in pairs, with each pair of lead screws (4) arranged at 180° to the center of the bearing (3).

7. A method for clamping bearing bushes, using the bearing bush clamping device according to claim 5, characterized in that: Includes the following steps: S1: Insert the bearing shell (3) into a small section of the valve shaft (2), and adjust the flange plane of the bearing shell (3) to be parallel to the plane of the valve body (1); S2: Screw in the lead screw (4) and polished rod (8) on the end face of the valve body (1); S3: First, put the reaction arm (7) into the screw (4), then screw the clamp (5) into the screw (4), then put the reaction arm (7) into the spline structure (511) of the clamp (5), and use a torque wrench to rotate the driving bevel gear (61) so that the clamp (5) is tightly against the bearing (3). S4: Install the anti-torsion bracket (9) on the lead screw (4) and the smooth rod (8); S5: An operator stands on each side of the bearing (3), puts the power head of the electric torque wrench on the hexagon of the drive bevel gear (61) of the clamping device (5), puts the reaction arm of the electric torque wrench on the housing (51) of the clamping device (5), and starts the wrench at the same time.

Images