Synchronous displacement mechanism of small-indexing circular tightening machine
Through the rotating displacement plate and guide wheel structure, the rotational motion is converted into linear motion, which solves the problem of synchronous displacement of the small index circular tightening machine, and realizes stable synchronous displacement and high-precision rotation of the tightening shaft.
Patent Information
- Application Number
- CN202421580799.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-07-05
AI Technical Summary
During the tightening operation of existing small index circular tightening machines, the arrangement space of multiple tightening guns is limited, resulting in the inability to achieve synchronous displacement, and there is no space in the center to arrange the displacement mechanism, resulting in unstable rotation of the displacement plate and low accuracy.
The rotary displacement plate and guide wheel structure are adopted. Through the coordination of the arc-shaped cam groove and guide wheel, the rotational movement is converted into linear movement, achieving synchronous displacement of the tightening shaft, and ensuring stable rotation of the displacement plate through the cooperation of the dovetail groove and the ball head surface.
The synchronous displacement of the small index circular tightening machine is realized, the displacement accuracy and stability of the tightening shaft is improved, the problem of space limitations is solved, and the demand for large-size displacement is met.
Smart Images
Figure CN223172393U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bolt tightening machines, and particularly relates to a synchronous displacement mechanism of a small pitch circle type tightening machine. Background Art
[0002] During the vehicle assembly process, due to the structural reasons of the tightening gun itself, when it is necessary to meet the tightening operations of small pitch circle type tires, differential gears, etc., multiple tightening guns carried by the tightening machine itself must be arranged closely to meet the minimum size requirements, and there is no extra space (hollow) in the center for the arrangement of the rotating shaft and the displacement plate. Therefore, in this case, a multi-axis fixed non-displacement tightening machine is generally used or manual holding of the tightening gun for multi-point tightening is adopted. Content of the Utility Model
[0003] In view of the defects of the prior art, the utility model provides a synchronous displacement mechanism of a small pitch circle type tightening machine, which adopts a rotatable displacement plate in cooperation with a plurality of displacement modules to convert the rotational motion into a linear motion, thereby realizing the synchronous displacement of the tightening shaft.
[0004] To achieve the above object, the technical solution provided by the utility model is a synchronous displacement mechanism of a small pitch circle type tightening machine, which includes a displacement plate, a plurality of displacement modules, and a rotary drive assembly; the displacement plate is annular, and the displacement plate is provided with a plurality of arc-shaped cam grooves; a plurality of displacement modules are evenly distributed along the circumferential direction of the displacement plate, and the displacement module includes a tightening shaft, a slider mechanism connected to the tightening shaft, and a guide wheel connected to the slider mechanism. The tightening shaft penetrates through the central hole of the displacement plate, and the guide wheel cooperates with the arc-shaped cam groove; the rotary drive assembly is used to drive the displacement plate to rotate around the central axis of the displacement plate. When the displacement plate rotates, the guide wheel displaces in the arc-shaped cam groove, driving the slider mechanism to perform a linear displacement towards or away from the central position of the displacement plate, so that a plurality of the tightening shafts converge inward or expand outward.
[0005] Further, the rotary drive assembly includes a servo motor, a gear connected to the servo motor, and an arc-shaped rack portion meshing with the gear, and the arc-shaped rack portion is fixed to the displacement plate.
[0006] Further, the slider mechanism is slidably connected to a front substrate, and a plurality of positioning wheels are arranged on the front substrate. The plurality of positioning wheels are arranged around the displacement plate and cooperate with the outer circumferential surface of the displacement plate to limit the displacement plate and enable the displacement plate to rotate centrically.
[0007] Further, a dovetail groove is provided on the outer circumferential surface of the positioning wheel, and the outer circumferential surface of the displacement plate is set as a spherical surface, and the spherical surface cooperates with the dovetail groove.
[0008] Further, a V-shaped groove is formed on the outer circumferential surface of the positioning wheel, the outer circumferential surface of the displacement plate is arranged as a V-shaped convex surface, and a conical centering structure is formed between the V-shaped groove and the V-shaped convex surface.
[0009] Further, a plurality of linear tracks are arranged on the front substrate, and a channel for the displacement of the slider mechanism is formed between each group of linear tracks.
[0010] Further, five displacement modules are provided.
[0011] Further, five arc-shaped cam grooves are provided.
[0012] Further, three, four or six displacement modules are provided.
[0013] Further, a plurality of tightening shafts are distributed on an equal-diameter indexing circle, and the tightening shafts are configured to be capable of outputting rotational torque outward for tightening bolts.
[0014] The beneficial effects of the present utility model: There are a plurality of displacement modules and displacement plates provided. When the displacement plate rotates, the guide wheel moves in the arc-shaped cam groove, converting the rotational motion into a linear displacement, thereby realizing the synchronous displacement of the tightening shafts. Description of the Drawings
[0015] Figure 1 is a schematic structural diagram of a synchronous displacement mechanism of a small indexing circle type tightening machine in an inwardly retracted state in an embodiment of the present utility model;
[0016] Figure 2 is Figure 1 a sectional view taken along A-A in
[0017] Figure 3 is a schematic structural diagram of the cooperation between the positioning wheel and the displacement plate in an embodiment of the present utility model;
[0018] Figure 4 is a schematic structural diagram of a synchronous displacement mechanism of a small indexing circle type tightening machine in an outwardly expanded state in an embodiment of the present utility model;
[0019] Figure 5 is a schematic structural diagram of the cooperation between the positioning wheel and the displacement plate in another embodiment of the present utility model;
[0020] In the figure:
[0021] 100. Displacement plate, 110. Arc-shaped cam groove, 120. Ball head surface,
[0022] 200. Displacement module, 210. Tightening shaft, 220. Slider mechanism, 230. Guide wheel,
[0023] 300, rotary drive assembly, 310, servo motor, 320, gear, 330, arc rack,
[0024] 400, front base plate, 410, positioning wheel, 411, dovetail groove, 420, linear track. DETAILED DESCRIPTION
[0025] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0026] See also Figure 1 、 Figure 2 and Figure 3 , shows a schematic structural diagram of a synchronous displacement mechanism of a small-division circular tightening machine in one embodiment of the present invention, which is used for tightening operations such as automobile tires and differential gears, and includes a displacement plate 100, multiple displacement modules 200, and a rotary drive assembly 300; the displacement plate 100 is annular and has multiple arc-shaped cam grooves 110; the multiple displacement modules 200 are evenly distributed along the circumferential direction of the displacement plate 100, and the displacement module 200 includes a tightening shaft 210 and a slider mechanism 220 connected to the tightening shaft 210. , and the guide wheel 230 connected to the slider mechanism 220, the tightening shaft 210 passes through the center hole of the displacement plate 100, and the guide wheel 230 cooperates with the arc cam groove 110; the rotation drive assembly 300 is used to drive the displacement plate 100 to rotate about the central axis of the displacement plate 100. When the displacement plate 100 rotates, the guide wheel 230 is displaced in the arc cam groove 110, driving the slider mechanism 220 to move linearly toward or away from the center position of the displacement plate 100, so that the multiple tightening shafts 210 are retracted inward or expanded outward.
[0027] In the prior art, when the bolts are distributed in a small pitch circle, the tightening machine cannot achieve synchronous displacement; the above-mentioned small pitch circle tightening machine synchronous displacement mechanism is provided with multiple displacement modules 200 and displacement plates 100. The displacement plate 100 rotates and utilizes the guide wheel 230 to displace in the arc cam groove 110, converting the rotational motion into linear displacement, thereby achieving synchronous displacement of the tightening shaft 210.
[0028] It should be noted that since the bolts are distributed on the small pitch circle, it means that the corresponding multiple tightening shafts 210 are also distributed within a small range. In this embodiment, a guide wheel 230 is provided. By matching the guide wheel 230 distributed on the large-diameter pitch circle with the arc-shaped cam groove 110 on the displacement plate 100, the displacement of the tightening shafts 210 distributed on the small pitch circle is synchronously driven. This structure is more suitable for small pitch circle type tightening machines and can adapt to the working conditions of bolts distributed on the small pitch circle.
[0029] In one embodiment, the rotary drive assembly 300 includes a servo motor 310, a gear 320 connected to the servo motor 310, and an arc-shaped rack portion 330 meshing with the gear 320. The arc-shaped rack portion 330 is fixed to the displacement plate 100. Refer to Figure 1 , specifically, the gear 320 can be arranged inside the arc-shaped rack portion 330. In other embodiments, the gear 320 is arranged outside the arc-shaped rack portion 330, as long as it can drive the displacement plate 100 to rotate.
[0030] When the tightening operation is synchronously displaced, without the center rotating shaft for centering, the rotation action of the displacement plate 100 is less reliable and the rotation axis is prone to deviation. In order to enable the displacement plate 100 to rotate stably and be centered, in one embodiment, the slider mechanism 220 is slidably connected to the front substrate 400. A plurality of positioning wheels 410 are provided on the front substrate 400. The plurality of positioning wheels 410 are arranged around the displacement plate 100 and cooperate with the outer circumferential surface of the displacement plate 100 to limit the displacement plate 100 and enable the displacement plate 100 to rotate centered.
[0031] Refer to Figure 4 , in one embodiment, a dovetail groove 411 is formed on the outer circumferential surface of the positioning wheel 410, and the outer circumferential surface of the displacement plate 100 is set as a spherical head surface 120. The spherical head surface 120 cooperates with the dovetail groove 411.
[0032] The above-mentioned synchronous displacement mechanism of the small pitch circle type tightening machine adopts the form of an outer spherical guiding displacement plate combined with a dovetail groove positioning wheel arranged at multiple points on the circumference. Without the center rotating shaft for centering, a reliable rotation action of the displacement plate 100 is achieved. The structure of the arc-shaped cam groove 110 and the guide wheel 230 (cam follower) is used to meet the need for large-size displacement. The spherical head surface 120 and the dovetail groove 411 have a high degree of fit when the displacement plate 100 is in use. When the two cooperate, there must be two tangents of the spherical head surface 120 that cooperate with the dovetail groove 4Il when the displacement plate 100 rotates / sways, ensuring the rotation accuracy and reducing wear.
[0033] Refer to Figure 5 , in another embodiment, a V-shaped groove is formed on the outer circumferential surface of the positioning wheel 410, and the outer circumferential surface of the displacement plate 100 is set as a V-shaped convex surface to center the displacement plate 100 by using the principle of conical surface centering.
[0034] In one embodiment, multiple sets of linear rails 420 are provided on the front substrate 400, with channels formed between each set of linear rails 420 for movement of the slider mechanism 220. This arrangement allows the linear rails 420 to guide the slider mechanism 220 in the middle, enabling it to move linearly without deviation, thereby improving the stability of the mechanism's operation.
[0035] Preferably, in one embodiment, five displacement modules 200 are provided.
[0036] Based on the above embodiment, five arc-shaped cam grooves 110 are provided.
[0037] It should be noted that each displacement module 200 is provided with a tightening shaft 210 and a guide wheel 230. The number of guide wheels 230 is the same as the number of arcuate cam grooves 110, and there is a one-to-one correspondence between them. Furthermore, three, four, or six displacement modules 200 can be provided, thus forming a three-axis, four-axis, or six-axis displacement, and can even be applied to displacement with more axes.
[0038] In one embodiment, a plurality of tightening shafts 210 are distributed on a pitch circle of equal diameter, and the tightening shafts 210 are configured to output rotational torque outward for tightening bolts.
[0039] The synchronous displacement mechanism of the above-mentioned small-division circular tightening machine adopts a combination of a slider mechanism 220 and a guide wheel 230 to extend the guiding relationship outward, thereby changing the original structure of displacement guided by the tightening shaft, thereby solving the problem that there is no space to arrange the displacement mechanism in the center of the tightening machine when small-division circular tightening is required; the combination of the arc cam groove 110 and the guide wheel 230 solves the problem that the displacement groove direction and the shaft displacement direction form a dead angle under large displacement distance, thereby causing poor displacement, consumption of motor power and even jamming. The combination of the dovetail groove 411 and the ball head surface 120, that is, the outer circumferential surface of the displacement plate 100 is set to the ball head surface 120, and the surrounding positioning wheels 410 use the dovetail groove 411. This solves the problem that when synchronous displacement is required for small-division circular tightening, the center of the tightening machine is forced to be hollow, thereby making it impossible to arrange the central rotating axis, resulting in the displacement plate being unable to rotate precisely and concentrically.
[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.
[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0042] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0043] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.
Claims
1. A synchronous displacement mechanism for a small pitch circle type tightening machine, characterized in that: including a displacement plate, which is annular, and the displacement plate is provided with a plurality of arc cam grooves; a plurality of displacement modules, which are evenly distributed along the circumferential direction of the displacement plate. The displacement module includes a tightening shaft, a slider mechanism connected to the tightening shaft, and a guide wheel connected to the slider mechanism. The tightening shaft penetrates through the central hole of the displacement plate, and the guide wheel is matched with the arc cam groove; a rotation driving assembly, which is used to drive the displacement plate to rotate around the central axis of the displacement plate. When the displacement plate rotates, the guide wheel displaces in the arc cam groove, driving the slider mechanism to perform a linear displacement towards or away from the central position of the displacement plate, so that the plurality of tightening shafts converge inwards or expand outwards.
2. The synchronous displacement mechanism of a small pitch circle type tightening machine according to claim 1, characterized in that: The rotation driving assembly includes a servo motor, a gear connected to the servo motor, and an arc rack portion meshed with the gear. The arc rack portion is fixed to the displacement plate.
3. The synchronous displacement mechanism of a small pitch circle type tightening machine according to claim 1, characterized in that: The slider mechanism is slidably connected to a front substrate. A plurality of positioning wheels are arranged on the front substrate. The plurality of positioning wheels are arranged around the displacement plate and cooperate with the outer circumferential surface of the displacement plate to limit the displacement plate and enable the displacement plate to rotate centrically.
4. The synchronous displacement mechanism of a small pitch circle type tightening machine according to claim 3, characterized in that: A dovetail groove is formed on the outer circumferential surface of the positioning wheel, and the outer circumferential surface of the displacement plate is set as a spherical surface, and the spherical surface is matched with the dovetail groove.
5. The synchronous displacement mechanism of a small pitch circle type tightening machine according to claim 3, characterized in that: A V-shaped groove is formed on the outer circumferential surface of the positioning wheel, and the outer circumferential surface of the displacement plate is set as a V-shaped convex surface, and the V-shaped groove and the V-shaped convex surface form a conical centering structure.
6. The synchronous displacement mechanism of a small pitch circle type tightening machine according to claim 3, characterized in that: A plurality of groups of linear tracks are arranged on the front substrate, and a channel for the displacement of the slider mechanism is formed between each group of linear tracks.
7. A synchronous displacement mechanism of a small pitch circle type tightening machine according to any one of claims 1-6, characterized in that: There are five displacement modules.
8. A synchronous displacement mechanism of a small pitch circle type tightening machine according to claim 7, characterized in that: There are five arc cam grooves.
9. A synchronous displacement mechanism for a small pitch circle type tightening machine according to any one of claims 1-6, characterized in that: The displacement module is provided with three, four or six.
10. A synchronous displacement mechanism of a small pitch circle type tightening machine according to any one of claims 1-6, characterized in that: The plurality of tightening shafts are distributed on an equidiameter pitch circle, and the tightening shafts are configured to be able to output rotational torque outwards for tightening bolts.