Bearing bush pressing device and pressing method

Abstract

The invention belongs to the technical field of ball valve assembling devices, and particularly relates to a bearing bush pressing device and method. According to the technical scheme, the bearing bush pressing device comprises a plurality of lead screws connected to the end face of a valve body, the lead screws are provided with pressing devices used for pressing bearing bushes between the valve body and a valve shaft, the pressing devices are located on the sides, away from the valve body, of the bearing bushes, transmission mechanisms are arranged in the pressing devices, and the input ends of the transmission mechanisms are connected with electric torque wrenches; the output end of the transmission mechanism is in threaded connection with the lead screw. According to the bearing bush pressing device and method, the physical strength of workers can be greatly saved.

Description

Technical Field

[0001] The invention belongs to the technical field of ball valve assembly devices, and in particular relates to a bearing bush pressing device and a pressing method. Background Art

[0002] At present, during the assembly of ball valves, the bearing bushing on the valve shaft side is installed in the following way: install it on the valve body with 4 long screws, install the nut on the outside of the bearing bushing, rotate the nut with a wrench, and press the bearing bushing into the valve body (see Fig.14 , Fig.15 ). The bearing is heavy, and the clearance between it and the inner hole of the valve body and the valve shaft is small, resulting in large friction resistance. At the same time, the pressed-in part of the bearing is close to 1 meter, that is, the working stroke of the nut is close to 1 meter, which leads to high labor intensity for the workers. In addition, since two workers are required to use wrenches to turn the nut at the same time on the opposite sides, it is difficult for the two workers to keep the same rhythm, which will cause the bearing to be skewed during the pressing process, and then the bearing cannot be pressed in further. It is necessary to stop frequently for adjustment, and even damage the outer circle of the bearing or the inner circle of the valve body. The bearing needs to be taken out for repair, and the work efficiency is low. Summary of the invention

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

[0004] The technical solution adopted by the present invention is:

[0005] A bearing bushing clamping device includes a plurality of screw rods connected to the end surface of a valve body. A clamping device for pressing the bearing bushing between the valve body and the valve shaft is arranged on the screw rods. The clamping device is located on the side of the bearing bushing away from the valve body. A transmission mechanism is arranged in 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 screw rods.

[0006] The screw is connected to the valve body so that the screw does not rotate. When the electric torque wrench drives the transmission mechanism to operate, while keeping the housing of the compression device fixed, the transmission mechanism engages with the screw to transmit, so that the housing of the compression device moves linearly relative to the screw to press the bearing bush between the valve body and the valve shaft to complete the bearing bush assembly.

[0007] The bearing pressing device of the present invention is easy to install and has a simple structure. The screw rod is installed in the pressing device to apply pressure to the bearing, and the electric torque wrench is used to provide power, which greatly saves the physical strength of the workers; the other two electric torque wrenches provide the same torque, which can also ensure that the bearing can basically move synchronously, avoid the bearing from skewing, make the pressing process smoother, and improve work efficiency.

[0008] As a preferred solution of the present invention, a reaction arm is connected to the clamp, and a plurality of polished rods are also connected to the end surface of the valve body, and one end of the reaction arm away from the clamp rests on the polished rod. The long handle of the reaction arm rests on the polished rod to offset the torque acting on the housing, prevent the housing from rotating, and keep the clamp in a fixed posture. By setting the reaction arm and the polished rod, it is possible to avoid manually keeping the housing from rotating, thereby achieving the purpose of saving effort.

[0009] As a preferred embodiment of the present invention, the clamp includes a housing, the transmission mechanism includes a driving bevel gear and a passive bevel gear, the driving bevel gear is meshed with the passive bevel gear, the rotating shaft of the driving bevel gear and the rotating shaft of the passive bevel gear are both rotatably connected in the housing, the rotating shaft of the driving bevel gear is connected to the output end of the electric torque wrench, the rotating shaft of the passive bevel gear is threadedly connected to the screw, and the passive bevel gear is connected to a pressure head for pressing the bearing shell.

[0010] When the electric torque wrench drives the active bevel gear to rotate, the active bevel gear drives the passive bevel gear to rotate. Since the screw and the housing do not rotate, the clamp moves linearly relative to the screw. The pressure head on the clamp pushes the bearing bush to move, so that the bearing bush is pressed between the valve body and the valve shaft.

[0011] As a preferred solution of the present invention, the rotating shaft of the active tapered bearing is connected to the housing through a ball bearing; the rotating shaft of the passive tapered gear is connected to the housing through an angular contact bearing, and a pressing ring for pressing the end face of the angular contact bearing is installed on the housing. The rotating shaft of the passive tapered gear is installed in the housing through a pair of angular contact bearings installed back to back, and is pre-tightened by the pressing ring. The angular contact bearing can withstand axial force and radial force.

[0012] As a preferred solution of the present invention, the housing is connected with a support cover, a copper sleeve is installed in the support cover, and the screw rod is sleeved in the copper sleeve. The support cover is equipped with a copper sleeve, and the inner circle of the copper sleeve matches the outer circle of the screw rod, which can improve the stress of the clamp.

[0013] As a preferred solution of the present invention, a spline structure is provided on the shell, a spline groove is provided at one end of the reaction arm, and the spline structure cooperates with the spline groove; a limit structure for blocking the reaction arm is provided on the shell, and the limit structure is located on the side of the reaction arm away from the bearing. In order to prevent the reaction force during the clamping process from causing the shell to rotate itself, an 18-sided spline structure is designed on the shell, and the spline structure cooperates with the spline groove at one end of the reaction arm. The limit structure on the shell causes the reaction arm to move along the screw rod along with the clamp.

[0014] As a preferred solution of the present invention, a rolling bearing is installed at one end of the reaction arm away from the clamp, and the polished rod contacts the rolling bearing. A rolling bearing is installed at the part where the long handle of the reaction arm contacts the polished rod to reduce the friction between the reaction arm and the polished rod and improve the transmission efficiency.

[0015] As a preferred embodiment of the present invention, the present invention further comprises an anti-torsion bracket, and the plurality of screw rods and the plurality of polished rods are all connected to the anti-torsion bracket. During the compression process of the bearing bush, the force acting on the screw rod and the polished rod will cause them to bend. In order to ensure the straightness of the polished rod and the screw rod, an anti-torsion bracket is installed at the end of the polished rod and the screw rod to increase the rigidity of the polished rod and the screw rod.

[0016] As a preferred solution of the present invention, a plurality of screw rods are grouped in two, and each group of screw rods is arranged at 180° with respect to the center of the bearing. When pressing the bearing, an operator stands on each side of the bearing, covers the power head of the electric torque wrench on the hexagon of the active bevel gear of the clamp, places the reaction force arm of the torque wrench on the housing of the clamp, and starts the wrench at the same time. Using the same type of electric torque wrench driven with the same torque can keep the clamps on both sides moving synchronously, greatly reducing the probability of scratching the bearing and the valve body.

[0017] A bearing bushing pressing method comprises the following steps:

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

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

[0020] S3: First, insert the reaction arm into the screw, then screw the clamp into the screw, and then insert the reaction arm into the spline structure of the clamp. Use a torque wrench to rotate the active bevel gear to make the clamp close to the bearing shell.

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

[0022] S5: An operator stands on each side of the bearing, puts the power head of the electric torque wrench on the hexagon of the active bevel gear of the clamp, puts the reaction force 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 the present invention are:

[0024] The bearing pressing device of the present invention is easy to install and has a simple structure. The screw rod is installed in the pressing device to apply pressure to the bearing, and the electric torque wrench is used to provide power, which greatly saves the physical strength of the workers; the other two electric torque wrenches provide the same torque, which can also ensure that the bearing can basically move synchronously, avoid the bearing from skewing, make the pressing process smoother, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of the assembly diagram of the present invention;

[0026] Figure 2It is a right side view of the assembly drawing of the present invention;

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

[0028] Figure 4 It is a right side view of the present invention;

[0029] Figure 5 It is the assembly drawing of the clamp and reaction arm;

[0030] Figure 6 is the front view of the compactor;

[0031] Figure 7 It is a right side view of the compactor;

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

[0033] Fig. 9 is a cross-sectional view of the shell;

[0034] Fig.10 It is a schematic diagram of the structure of the inverse ratio arm;

[0035] Fig.11 It is a cross-sectional view of the reaction arm structure;

[0036] Fig.12 It is a structural diagram of the screw rod;

[0037] Fig.13 It is a schematic diagram of the structure of the light rod;

[0038] Fig.14 It is a partial structural diagram of the ball valve;

[0039] Fig.15 It is a structural schematic diagram of an existing bearing bush press-fitting device.

[0040] In the figure: 1-valve body; 2-valve shaft; 3-bearing bush; 4-screw rod; 5-pressor; 6-transmission mechanism; 7-reaction arm; 8-light rod; 9-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 DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

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

[0044] The screw rod 4 is connected to the valve body 1, so that the screw rod 4 does not rotate. When the electric torque wrench drives the transmission mechanism 6 to operate, while keeping the housing 51 of the compression device 5 not rotating, the transmission mechanism 6 engages with the screw rod 4 for transmission, so that the housing 51 of the compression device 5 moves linearly relative to the screw rod 4, so as to press the bearing bush 3 into between the valve body 1 and the valve shaft 2, and complete the assembly of the bearing bush 3.

[0045] The bearing bushing clamping device of the present invention is easy to install and has a simple structure. The screw rod 4 is installed into the clamping device 5 to apply pressure to the bearing bush 3, and the electric torque wrench is used to provide power, which greatly saves the physical strength of the workers; the other two electric torque wrenches provide the same torque, which can also ensure that the bearing bush 3 can basically move synchronously, avoid the skewness of the bearing bush 3, make the pressing process smoother, and improve work efficiency.

[0046] Furthermore, the clamp 5 is connected with a reaction arm 7, and the end surface of the valve body 1 is also threadedly connected with four polished rods 8, and the end of the reaction arm 7 away from the clamp 5 leans against the polished rod 8. The long handle of the reaction arm 7 leans against the polished rod 8 to offset the torque acting on the housing 51, prevent the housing 51 from rotating itself, and keep the clamp 5 in a fixed posture. By setting the reaction arm 7 and the polished rod 8, it is possible to avoid manually keeping the housing 51 from rotating, thereby achieving the purpose of saving effort.

[0047] Specifically, the clamp 5 includes a shell 51, and the transmission mechanism 6 includes a driving bevel gear 61 and a passive bevel gear 62. The driving bevel gear 61 is meshed with the passive bevel gear 62. The rotating shaft of the driving bevel gear and the rotating shaft of the passive bevel gear 62 are both rotatably connected in the shell 51. The rotating shaft of the driving bevel gear 61 is connected to the output end of the electric torque wrench, and the rotating shaft of the passive bevel gear 62 is threadedly connected to the screw 4. The passive bevel gear 62 is threadedly connected with a pressure head 52 for pressing the bearing shell 3.

[0048] When the electric torque wrench drives the active bevel gear 61 to rotate, the active bevel gear 61 drives the passive bevel gear 62 to rotate. Since the screw rod 4 and the housing 51 do not rotate, the clamp 5 as a whole moves linearly relative to the screw rod 4. The pressure head 52 on the clamp 5 pushes the bearing bush 3 to move, so that the bearing bush 3 is pressed between the valve body 1 and the valve shaft 2.

[0049] The non-meshing end of the active bevel gear 61 is a hexagonal structure, which can be matched with the electric torque wrench sleeve. When the active bevel gear 61 is rotated with the electric torque wrench, the passive bevel gear 62 will be driven to rotate together. The inner hole of the passive bevel gear 62 is a trapezoidal thread, which cooperates with the screw 4 to convert the rotational motion into a linear motion, so that the clamp 5 moves linearly along the screw 4.

[0050] The housing 51 is provided with a mounting hole to facilitate the installation of the driving bevel gear 61. The mounting hole is sealed with a cover 58.

[0051] The rotating shaft of the active tapered bearing is connected to the housing 51 through a ball bearing 53; the rotating shaft of the passive tapered gear 62 is connected to the housing 51 through an angular contact bearing 54, and a pressing ring 55 for pressing the end face of the angular contact bearing 54 is installed on the housing 51. The rotating shaft of the passive tapered gear 62 is installed in the housing 51 through a pair of angular contact bearings 54 installed back to back, and is pre-tightened by the pressing ring 55. The angular contact bearing 54 can withstand axial force and radial force.

[0052] The housing 51 is connected with a support cover 56, in which a copper sleeve 57 is installed, and the screw rod 4 is sleeved in the copper sleeve 57. The support cover 56 is provided with a copper sleeve 57, and the inner circle of the copper sleeve 57 matches the outer circle of the screw rod 4, which can improve the stress condition of the presser 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, and the spline structure 511 cooperates with the spline groove 71; the housing 51 is provided with a limiting structure 512 for blocking the reaction arm 7, and the limiting structure 512 is located on the side of the reaction arm 7 away from the bearing bush 3. In order to prevent the reaction force during the clamping process from causing the housing 51 to rotate itself, an 18-sided spline structure 511 is designed on the housing 51, and the spline structure 511 cooperates with the spline groove 71 at one end of the reaction arm 7. The limiting structure 512 on the housing 51 will make the reaction arm 7 move along the screw 4 along with the clamp 5.

[0054] In order to reduce the friction between the reaction arm 7 and the polished rod 8, a rolling bearing 72 is installed at one end of the reaction arm 7 away from the clamp 5, and the polished rod 8 contacts the rolling bearing 72. The rolling bearing 72 is installed at the part where the long handle of the reaction arm 7 contacts the polished rod 8 to reduce the friction between the reaction arm 7 and the polished rod 8 and improve the transmission efficiency.

[0055] The present invention also includes an anti-torsion bracket 9, and the four screw rods 4 and the four smooth rods 8 are all connected to the anti-torsion bracket 9. During the compression process of the bearing bush 3, the force acting on the screw rods 4 and the smooth rods 8 will cause them to bend. In order to ensure the straightness of the smooth rods 8 and the screw rods 4, the anti-torsion bracket 9 is installed at the ends of the smooth rods 8 and the screw rods 4 to increase the rigidity of the smooth rods 8 and the screw rods 4.

[0056] It should be noted that one screw rod 4 and one polished rod 8 form a group, and there are 4 groups in total, which are evenly distributed along the circumference with the bearing bush 3 as the center. In this embodiment, four screw rods 4 and four polished rods 8 are evenly distributed along the circumference with the bearing bush 3 as the center.

[0057] When press-fitting the bearing bush 3, an operator stands on each side of the bearing bush 3, covers the power head of the electric torque wrench on the hexagon of the driving bevel gear 61 of the clamp 5, puts the reaction force arm of the torque wrench on the housing 51 of the clamp 5, and starts the wrench at the same time. Using the same type of electric torque wrench to drive with the same torque can keep the clamps 5 on both sides moving synchronously, greatly reducing the probability of grinding damage to the bearing bush 3 and the valve body 1.

[0058] The bearing bushing pressing method of this embodiment comprises the following steps:

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

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

[0061] S3: First, insert the reaction arm 7 into the screw rod 4, then screw the clamp 5 into the screw rod 4, and then insert the reaction arm 7 into the spline structure 511 of the clamp 5, and use a torque wrench to rotate the active bevel gear 61 to make the clamp 5 close to the bearing bush 3;

[0062] S4: Install the anti-torsion bracket 9 on the screw rod 4 and the polished rod 8;

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

[0064] Since the reaction force arm of the electric torque wrench itself is against the housing 51 , the operator does not need to bear the reaction force generated by the torque wrench, and only needs to keep the electric torque wrench from being separated from the tightener 5 , which is very convenient and labor-saving.

[0065] The bearing bushing clamping device of the present invention can greatly reduce the labor intensity of installing and pressing the bearing bushing 3 and improve work efficiency. At the same time, due to the same type of torque wrench, the same torque setting can keep the clamping device 5 moving synchronously, greatly reducing the probability of grinding and scratching the bearing bushing 3 and the valve body 1.

[0066] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A bearing bushing clamping device, characterized in that: The invention comprises a plurality of screw rods (4) connected to the end surface of a valve body (1), wherein a compression device (5) for pressing a bearing bush (3) between the valve body (1) and a valve shaft (2) is arranged on the screw rods (4), the compression device (5) is located on the side of the bearing bush (3) away from the valve body (1), and a transmission mechanism (6) is arranged inside the compression 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 screw rods (4).

2. A bearing bushing pressing device according to claim 1, characterized in that: The clamp (5) is connected to a reaction arm (7), and the end surface of the valve body (1) is also connected to a plurality of polished rods (8), and one end of the reaction arm (7) away from the clamp (5) rests on the polished rod (8).

3. A bearing bushing pressing device according to claim 2, characterized in that: The pressing device (5) comprises a housing (51), and the transmission mechanism (6) comprises a driving bevel gear (61) and a driven bevel gear (62). The driving bevel gear (61) meshes with the driven bevel gear (62). The rotating shaft of the driving bevel gear and the rotating shaft of the driven bevel gear (62) are both rotatably connected in the housing (51). The rotating shaft of the driving bevel gear (61) is connected to the output end of the electric torque wrench, and the rotating shaft of the driven bevel gear (62) is threadedly connected to the screw rod (4). The driven bevel gear (62) is connected to a pressing head (52) for pressing the bearing bush (3).

4. A bearing bushing pressing device according to claim 3, characterized in that: The rotating shaft of the active tapered bearing is connected to the housing (51) via a ball bearing (53); the rotating shaft of the passive tapered gear (62) is connected to the housing (51) via an angular contact bearing (54), and a pressing ring (55) for pressing the end face of the angular contact bearing (54) is installed on the housing (51).

5. A bearing bushing pressing device according to claim 3, characterized in that: The housing (51) is connected to a support cover (56), a copper sleeve (57) is installed in the support cover (56), and the screw rod (4) is sleeved in the copper sleeve (57).

6. A bearing bushing pressing device according to claim 2, characterized in that: The housing (51) is provided with a spline structure (511), one end of the reaction arm (7) is provided with a spline groove (71), and the spline structure (511) cooperates with the spline groove (71); the housing (51) is provided with a limiting structure (512) for blocking the reaction arm (7), and the limiting structure (512) is located on a side of the reaction arm (7) away from the bearing bush (3).

7. A bearing bushing pressing device according to claim 2, characterized in that: A rolling bearing (72) is installed at one end of the reaction arm (7) away from the clamp (5), and the polished rod (8) is in contact with the ball bearing (72) (53).

8. A bearing bushing pressing device according to claim 2, characterized in that: It also includes an anti-torsion bracket (9), and a plurality of screw rods (4) and a plurality of polished rods (8) are all connected to the anti-torsion bracket (9).

9. A bearing bushing pressing device according to claim 1, characterized in that: The plurality of screw rods (4) are arranged in groups of two, and each group of screw rods (4) is arranged at 180 degrees with respect to the center of the bearing bush (3).

10. A bearing bushing pressing method, using the bearing bushing pressing device according to claim 3, characterized in that: The following steps are involved: S1: Install the bearing (3) into a small section of the valve shaft (2) and adjust the flange plane of the bearing (3) to be parallel to the plane of the valve body (1); S2: screwing the screw rod (4) and the polished rod (8) into the end surface of the valve body (1); S3: First, insert the reaction arm (7) into the screw rod (4), then screw the pressure device (5) into the screw rod (4), and then insert the reaction arm (7) into the spline structure (511) of the pressure device (5), and use a torque wrench to rotate the driving bevel gear (61) so that the pressure device (5) is close to the bearing bush (3); S4: Install the anti-torsion bracket (9) on the screw rod (4) and the smooth rod (8); S5: An operator stands on each side of the bearing (3), covers the power head of the electric torque wrench on the hexagon of the active bevel gear (61) of the presser (5), places the reaction force arm of the electric torque wrench on the housing (51) of the presser (5), and starts the wrench at the same time.

Images