Automatic tightening equipment

Abstract

The present invention provides an automatic tightening device. The automatic tightening device comprises: a support body with an inner hole, a screwdriver bit connecting shaft passing through the inner hole, a pressure-torsion composite sensor and a motor, wherein the output shaft of the motor is connected to one end of the screwdriver bit connecting shaft, the screwdriver bit connecting shaft is connected to the support body through a bearing, the bearing and the support body are tightly fitted, the circumference of the pressure-torsion composite sensor is fixedly connected to the support body, and the upper end face of the pressure-torsion composite sensor is fixedly connected to the end face of the motor. By adopting a structure in which the circumference of the pressure-torsion composite sensor is fixedly connected to the support body, and the upper end face of the pressure-torsion composite sensor is fixedly connected to the end face of the motor, the automatic tightening device can simultaneously measure pressure and torque.

Description

Technical Field

[0001] The invention relates to the technical field of bolt tightening equipment, and in particular to an automatic tightening equipment. Background Art

[0002] In the actual application of automatic tightening technology, tightening pressure and torque are the two most important technical parameter indicators that affect the tightening accuracy. However, due to the structural characteristics of electric tightening devices, motor characteristic limitations, inconsistent operations and other usage factors, it is difficult to detect feedback through software and circuits in pressure testing. Therefore, most of the automatic tightening equipment on the market currently only stays on the detection of torque, which makes it difficult to ensure the quality of the operation. Summary of the invention

[0003] The invention provides an automatic tightening device, which is used to solve the defect that the automatic tightening device in the prior art can only detect torque, and realizes the simultaneous detection of pressure and torque by adopting a pressure-torsion composite sensor.

[0004] The present invention provides an automatic tightening device, comprising: a support body with an inner hole, a screwdriver bit connecting shaft passing through the inner hole, a compression-torsion composite sensor and a motor.

[0005] Among them, the output shaft of the motor passes through the pressure-torsion composite sensor and is connected to one end of the screwdriver bit connecting shaft, the screwdriver bit connecting shaft is connected to the support body through a bearing, the bearing and the support body are tightly fitted, the circumference of the pressure-torsion composite sensor is fixedly connected to the support body, and the upper end face of the pressure-torsion composite sensor is fixedly connected to the end face of the motor.

[0006] According to the automatic tightening equipment provided by the present invention, the upper end of the support body is provided with a boss, the first threaded holes are evenly distributed on the outer circumference of the boss, the outer circumference of the compression-torsion composite sensor is provided with second threaded holes, and bolts pass through the first threaded holes and the second threaded holes to connect the support body with the compression-torsion composite sensor.

[0007] The automatic tightening device provided according to the present invention also includes a bearing slide, which includes a mating ear, and the inner circumference of the boss is symmetrically provided with grooves, the mating ears of the bearing slide are matched with the grooves, and the inner diameter of the bearing slide is tightly matched with the bearing circumference.

[0008] The automatic tightening device provided according to the present invention further comprises a motor connecting shaft, and the bit connecting shaft is connected to the output shaft of the motor through the motor connecting shaft.

[0009] According to the automatic tightening device provided by the present invention, a motor shaft matching hole is formed at one end of the motor connecting shaft, and a primary shaft head is formed at the other end.

[0010] Among them, a secondary shaft head is formed at one end of the bit connecting shaft that cooperates with the motor connecting shaft, and the primary shaft head of the motor connecting shaft cooperates with the secondary shaft head of the bit connecting shaft.

[0011] According to the automatic tightening device provided by the present invention, the motor shaft matching hole of the motor connecting shaft is connected to the output shaft of the motor through a key.

[0012] The automatic tightening device provided according to the present invention further comprises a bushing, and the lower end of the bit connecting shaft is connected to the supporting body through the bushing.

[0013] The automatic tightening device provided according to the present invention further comprises a bushing retaining ring and a sealing ring, wherein the bushing retaining ring and the sealing ring are installed at the end of the bushing.

[0014] The automatic tightening device provided according to the present invention further comprises a gasket, which is installed between the motor and the compression-torsion composite sensor.

[0015] According to the automatic tightening device provided by the present invention, a bit connecting hole is formed at the lower end of the bit connecting shaft, and a bit is installed in the bit connecting hole.

[0016] The automatic tightening device provided by the present invention can simultaneously measure pressure and torque by adopting a structure in which the circumference of the compression-torsion composite sensor is fixedly connected to the support body and the upper end face of the compression-torsion composite sensor is fixedly connected to the end face of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is an exploded view of the automatic tightening device provided by the present invention;

[0019] Figure 2 yes Figure 1 A local enlarged view of point A in FIG.

[0020] Reference numerals:

[0021] 100: support body; 101: boss; 102: bearing slide seat;

[0022] 103: bearing; 104: screwdriver bit connecting shaft; 105: bushing retaining ring;

[0023] 106: bushing; 107: sealing ring; 200: compression-torsion composite sensor;

[0024] 201: Motor connecting shaft; 300: Motor; 301: Gasket;

[0025] 302: output shaft; 110: groove; 120: mating ear;

[0026] 130: bit ejector; 140: ejector spring; 150: secondary shaft head;

[0027] 160: First-level shaft head. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0032] Combine the following Figure 1 and Figure 2 It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute a limitation on the present invention.

[0033] The embodiment of the present invention provides an automatic tightening device, which includes: a support body 100 with an inner hole, a screwdriver bit connecting shaft 104 passing through the inner hole, a compression-torsion composite sensor 200 and a motor 300 .

[0034] Specifically, the output shaft 302 of the motor 300 passes through the compression-torsion composite sensor 200 and is connected to one end of the screwdriver bit connecting shaft 104. The screwdriver bit connecting shaft 104 is connected to the support body 100 through the bearing 103. The bearing 103 is tightly fitted to the support body 100. The circumference of the compression-torsion composite sensor 200 is fixedly connected to the support body 100. The upper end surface of the compression-torsion composite sensor 200 is fixedly connected to the end surface of the motor 300.

[0035] In one embodiment of the present invention, the inner hole may be a stepped structure, and the motor 300 may be a reduction motor.

[0036] In one embodiment of the present invention, the upper end of the support body 100 is provided with a boss 101. First threaded holes are evenly distributed on the outer circumference of the boss 101. Second threaded holes are opened on the outer circumference of the compression-torsion composite sensor 200. Bolts pass through the first threaded holes and the second threaded holes to connect the support body 100 with the compression-torsion composite sensor 200.

[0037] In such Figure 1 and Figure 2 In the embodiment shown, the number of the first threaded holes and the second threaded holes is, for example, eight, that is, the number of the bolts is also eight. Of course, it should be understood that the number of the first threaded holes, the second threaded holes and the bolts can be set according to specific circumstances. Further, in one embodiment of the present invention, the compression-torsion composite sensor 200 is, for example, an "I"-shaped structure, which is used to test pressure and torque at the same time.

[0038] In other words, in this embodiment, the middle part of one end of the compression-twist composite sensor 200 that cooperates with the boss 101 is concave, so that it can fit with the boss 101, and other structures in the boss 101 can be placed in the concave part of the compression-twist composite sensor 200.

[0039] In one embodiment, a bit connection hole is formed at the lower end of the bit connection shaft 104, and a bit 400 is installed in the bit connection hole.

[0040] Specifically, a bit 400 is connected to the lower end of the bit connecting shaft 104, and the bit 400 is pressed on the bolt cap. The pressure is transmitted to the motor 300 through the bit connecting shaft 104, and the motor 300 is connected to the upper end surface of the pressure-torsion composite sensor 200. Therefore, the pressure is transmitted to the pressure-torsion composite sensor 200, and the pressure is measured by the pressure-torsion composite sensor 200.

[0041] When the screwdriver bit 400 starts to rotate, the torque is transmitted to the support body 100 through the screwdriver bit connecting shaft 104. The support body 100 is circumferentially connected to the compression-torsion composite sensor 200, so the torque is transmitted to the compression-torsion composite sensor 200, and the compression-torsion composite sensor 200 measures the torque.

[0042] In one embodiment of the present invention, the automatic tightening device further includes a bearing slide 102. The bearing slide 102 includes a mating ear 120, and grooves 110 are symmetrically formed on the inner circumference of the boss 101. Accordingly, the mating ears 120 are symmetrically distributed on the outer circumference of the bearing slide 102. The mating ears 120 of the bearing slide 102 are mated with the grooves 110. The screwdriver bit connecting shaft 104 can drive the bearing 103 and the bearing slide 102 to perform axial linear motion along the grooves 110 under the action of the axial top force of the screwdriver bit 400.

[0043] At the same time, the inner diameter of the bearing slide 102 is tightly matched with the bearing 103 in the circumferential direction.

[0044] In general, the bearing 103 is tightly assembled with the screwdriver bit connecting shaft 104 and the bearing slide 102. The tight fit between the bearing 103 and the screwdriver bit connecting shaft 104 enables the screwdriver bit connecting shaft 104 to rotate under the support of the bearing 103. The tight fit between the bearing 103 and the bearing slide 102 enables the circumferential fixation of the bearing 103 to prevent it from rotating under the drive of the screwdriver bit connecting shaft 104.

[0045] In one embodiment of the present invention, a stepped hole is formed inside the bit connecting shaft 104, and a bit ejector pin 130 and an ejector spring 140 are installed in the stepped hole. The bit ejector pin 130 has a raised blocking ring. One end of the bit ejector pin 130 is installed in the stepped hole of the bit connecting shaft 104. The stepped hole and the blocking ring are limited to the extreme position. Moreover, the end surface of the bit ejector pin 130 contacts the bit 400.

[0046] Specifically, the ejector spring 140 is installed in a tight fit manner on the other end of the bit ejector 130, i.e., on the side of the blocking ring, and the ejector spring 140 is limited by the blocking ring. The cooperation between the bit ejector 130 and the ejector spring 140 plays an auxiliary role in adjusting the axial height of the bit 400 during installation and operation.

[0047] In one embodiment of the present invention, the automatic tightening device further includes a motor connecting shaft 201 , and the bit connecting shaft 104 is connected to the output shaft 302 of the motor 300 via the motor connecting shaft 201 .

[0048] In the embodiment of the present invention, a motor shaft matching hole is formed at one end of the motor connecting shaft 201, and a primary shaft head 160 is formed at the other end. The structure of the primary shaft head 160 is a structure left by cutting off two sides of the cylinder at two parallel surfaces in the axial direction of the cylinder, that is, the end face of the primary shaft head 160 includes two symmetrical arc segments and two symmetrical straight line segments.

[0049] Furthermore, the motor connecting shaft 201 passes through the compression-torsion composite sensor 200 and is connected to the screwdriver connecting shaft 104, and one end of the screwdriver connecting shaft 104 that cooperates with the motor connecting shaft 201 forms a secondary shaft head 150. The secondary shaft head 150 includes two D-shaped columns, the plane sides of the two D-shaped columns are opposite and there is a gap in the middle. A stepped hole is opened in the gap.

[0050] The primary shaft head 160 of the motor connecting shaft 201 cooperates with the secondary shaft head 150 of the screwdriver connecting shaft 104, and the cooperation is specifically as follows: the primary shaft head 160 of the motor connecting shaft 201 is placed in the interval between the two D-shaped cylinders of the secondary shaft head 150, and the plane sides of the two D-shaped cylinders are in contact with the plane where the straight line segments of the end faces of the primary shaft head 160 are located. Thus, the radial runout problem during the transmission process between the motor connecting shaft 201 and the screwdriver connecting shaft 104 is solved.

[0051] In one embodiment of the present invention, the diameter of the circle where the primary shaft head 160 of the motor connecting shaft 201 is located is greater than the diameter of the circle where the secondary shaft head 150 is located. More specifically, the length of the contact end faces of the plane sides of the two D-shaped cylinders of the secondary shaft head 150 in the radial direction is less than the length of the straight line segment of the end face of the primary shaft head 160. The self-adjustment function of the screwdriver bit connecting shaft 104 and the motor connecting shaft 201 in the radial direction is realized.

[0052] Furthermore, after the primary shaft head 160 is matched with the bit connecting shaft 104 , the primary shaft head 160 presses the bit ejector pin 130 and the ejector pin spring 140 into the stepped hole of the bit connecting shaft 104 .

[0053] In one embodiment of the present invention, the motor shaft matching hole of the motor connecting shaft 201 is connected to the output shaft 302 of the motor 300 via a key.

[0054] In one embodiment of the present invention, the automatic tightening device further includes a bushing 106 , and the lower end of the bit connecting shaft 104 is connected to the support body 100 via the bushing 106 .

[0055] In one embodiment of the present invention, the automatic tightening device further includes a bushing retaining ring 105 and a sealing ring 107 , and the bushing retaining ring 105 and the sealing ring 107 are installed at the end of the bushing 106 .

[0056] Specifically, the bushing 106 is fixed by the bushing retaining ring 105, providing axial positioning and auxiliary support for the rotation and linear motion of the screwdriver bit connecting shaft 104. The sealing ring 107 is used to provide protection for the bushing 106. The bushing 106 is preferably a ball bushing.

[0057] In one embodiment of the present invention, the automatic tightening device further includes a gasket 301 , and the gasket 301 is installed between the motor 300 and the compression-torsion composite sensor 200 .

[0058] Therefore, in order to detect pressure and torque simultaneously during the tightening process to ensure the accuracy and quality of the tightening operation, the above multi-degree-of-freedom self-adjusting automatic tightening equipment based on the pressure-torsion composite sensor is designed. The equipment realizes the simultaneous detection of pressure and torque during the automatic tightening operation, and its unique transmission structure design greatly reduces the transmission error, providing efficient guarantee for the operation accuracy and stability.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic tightening device, characterized in that: include: A support body with an inner hole, a screwdriver bit connecting shaft passing through the inner hole, a compression-torsion composite sensor and a motor, The output shaft of the motor passes through the pressure-torsion composite sensor and is connected to one end of the screwdriver bit connecting shaft, the screwdriver bit connecting shaft is connected to the support body through a bearing, the bearing and the support body are tightly fitted, the circumference of the pressure-torsion composite sensor is fixedly connected to the support body, and the upper end surface of the pressure-torsion composite sensor is fixedly connected to the end surface of the motor; The upper end of the support body is provided with a boss, the outer circumference of the boss is evenly distributed with first threaded holes, the outer circumference of the compression-torsion composite sensor is provided with second threaded holes, and bolts pass through the first threaded holes and the second threaded holes to connect the support body with the compression-torsion composite sensor; It also includes a bearing slide, the bearing slide includes a matching ear, and the inner circumference of the boss is symmetrically provided with grooves, the matching ears of the bearing slide are matched with the grooves, and the inner diameter of the bearing slide is tightly matched with the bearing circumference; a motor shaft matching hole is formed at one end of the motor connecting shaft, and a primary shaft head is formed at the other end, wherein a secondary shaft head is formed at the end of the screwdriver connecting shaft that matches the motor connecting shaft, and the primary shaft head of the motor connecting shaft matches the secondary shaft head of the screwdriver connecting shaft; the middle part of the end of the compression-torsion composite sensor that matches the boss is recessed, and the primary shaft head of the motor connecting shaft is placed in the interval between the two D-shaped cylinders of the secondary shaft head, and the planar sides of the two D-shaped cylinders are in contact with the plane where the straight line segment of the end face of the primary shaft head is located.

2. The automatic tightening device according to claim 1, characterized in that: It also includes a motor connecting shaft, and the bit connecting shaft is connected to the output shaft of the motor through the motor connecting shaft.

3. The automatic tightening device according to claim 1, characterized in that: The motor shaft matching hole of the motor connecting shaft is connected to the output shaft of the motor through a key.

4. The automatic tightening device according to claim 1, characterized in that: It also includes a bushing, and the lower end of the bit connecting shaft is connected to the support body through the bushing.

5. The automatic tightening device according to claim 4, characterized in that: It also includes a bushing retaining ring and a sealing ring, wherein the bushing retaining ring and the sealing ring are installed at the end of the bushing.

6. The automatic tightening device according to claim 1, characterized in that: It also includes a gasket, which is installed between the motor and the compression-torsion composite sensor.

7. The automatic tightening device according to claim 1, characterized in that: A bit connecting hole is formed at the lower end of the bit connecting shaft, and a bit is installed in the bit connecting hole.

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