A centering positioning mechanism

Abstract

This utility model discloses a centering positioning mechanism, relating to the field of positioning structures. The mechanism includes a centering base, a support rod fixed at the center of the base's bottom surface, a base plate fixed at the bottom of the support rod, and four symmetrical stabilizing rods between the centering base and the base plate to enhance the stability of the centering base. This centering positioning mechanism, through an adjustable screw and threaded hole mating structure, coupled with a liftable adjustment block, allows for convenient adjustment of the distance between the centering block and the pressure detection component after wear occurs. The adjustment block ensures accurate adjustment, achieving precise compensation for wear and effectively maintaining centering positioning accuracy after long-term use.

Description

Technical Field

[0001] This utility model relates to the field of positioning structures, and in particular to a centering positioning mechanism. Background Technology

[0002] Traditional mechanical centering and positioning mechanisms are prone to wear and tear due to repeated friction between components during long-term use, and their structural design lacks effective compensation and adjustment methods for this wear. As wear accumulates, the synchronous movement accuracy of the centering block gradually decreases, causing a misalignment between the workpiece center and the mechanism's reference center, resulting in a continuous deterioration in centering and positioning accuracy. This problem of wear not being corrected in a timely manner seriously affects the consistency of accuracy in subsequent machining, assembly, and other processes. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide a centering and positioning mechanism that solves the problem of decreased centering and positioning accuracy caused by the inability to compensate for wear and tear during long-term use of traditional mechanical centering and positioning mechanisms.

[0004] To address the problems in the existing technology, the technical solution of this utility model is as follows: A centering positioning mechanism includes a centering base, on which a plurality of sliding grooves are provided at equal angular intervals around its axis. A centering block is slidably connected in the sliding grooves. A pressure sensor is installed on the side of the centering block near the axis of the centering base through a linear adjustment assembly. The linear adjustment assembly is used to adjust the distance between the pressure sensor and the centering block. The sliding groove has a liftable adjustment block at one end near the centering base axis. Under normal conditions, the adjustment block is submerged in the sliding groove, and the lower end of the adjustment block protrudes from the bottom surface of the centering base. During adjustment, the adjustment block protrudes to the top surface of the centering base and faces the pressure sensor.

[0005] Optionally, the linear adjustment assembly includes a threaded hole on the upper end of the centering block, the axis of the threaded hole being perpendicular to the axis of the centering base. A screw is threaded into the threaded hole, a pressure sensor is fixed to the end of the screw, and a knob is fixed to the end of the screw away from the pressure sensor. The knob is in the shape of a flat cylinder, and its circumferential outer wall is provided with anti-slip textures at equal intervals.

[0006] Optionally, a connecting rod is fixed to the lower end of the adjustment block near the axis of the centering base. A limiting sleeve is fixed to one end of multiple connecting rods near the axis of the centering base. The limiting sleeve is slidably sleeved on the outside of the support rod at the center of the bottom surface of the centering base. The limiting sleeve is provided with a positioning component, which is used to limit the position of the limiting sleeve and the support rod. The limiting sleeve is a spline sleeve and the support rod is a spline shaft.

[0007] Optionally, the positioning component includes a pin that is slidably inserted into the side wall of the limiting sleeve through a sliding hole. The pin axis is perpendicular to the axis of the limiting sleeve. The end of the pin near the support rod is hemispherical, and a convex ring is formed on the outer side of the end of the pin away from the support rod. A spring is fitted onto the end of the pin near the convex ring. One end of the spring is fixed to the outer wall of the convex ring, and the other end is fixed to the outer wall of the limiting sleeve. Under the action of the spring, the pin always tends to slide towards the side closer to the support rod. Two slots are sequentially formed at the upper end of the support rod from top to bottom, and the positions of the slots correspond to the positions of the pin. Under normal conditions, the end of the pin abuts in the lower slot, and during adjustment, the end of the pin abuts in the upper slot.

[0008] Compared with the prior art, the advantages of this utility model are as follows: This utility model, by setting an adjustable screw and threaded hole mating structure, and with a height-adjustable adjustment block, can conveniently adjust the distance between the centering block and the pressure detection component after the centering positioning mechanism wears out. It can also ensure the accuracy of adjustment with the help of the adjustment block, achieve precise compensation for wear, and effectively maintain the centering positioning accuracy after long-term use. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0010] Figure 2 This is a diagram showing the positional relationship between the centering block and the slide groove in this utility model.

[0011] Figure 3 This is a schematic diagram showing the position of the support rod of this utility model.

[0012] Figure 4 This is a schematic diagram of the limiting sleeve structure of this utility model.

[0013] Figure 5 This is a schematic diagram of the pin structure of this utility model.

[0014] Reference numerals: 1. Centering base; 101. Slide groove; 2. Support rod; 3. Base plate; 4. Centering block; 401. Threaded hole; 5. Screw; 6. Knob; 7. Pressure sensor; 8. Adjustment block; 9. Connecting rod; 10. Limiting sleeve; 11. Pin; 12. Protruding ring; 13. Spring; 14. Slot. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] Please see Figures 1 to 5This embodiment provides a centering positioning mechanism, including a centering base 1, a support rod 2 fixed at the center of the bottom surface of the centering base 1, a base plate 3 fixed at the bottom of the support rod 2, and four stabilizing rods symmetrically arranged between the centering base 1 and the base, thereby enhancing the stability of the centering base 1.

[0017] The centering base 1 has four sliding grooves 101 spaced at equal angles around its axis. Centering blocks 4 are slidably connected in the sliding grooves 101. The support rod 2 is a spline shaft. A lifting sleeve is slidably sleeved on the outside of the support rod 2. The lifting sleeve is a spline sleeve. This ensures that the lifting sleeve can only slide up and down along the support rod 2 and cannot rotate relative to it. Four push bars are hinged at equal angles on the circumferential outer wall of the lifting sleeve. Each push bar is directly opposite a centering block 4. The upper end of the push bar is hinged to the bottom of the centering block 4. An electric push rod is fixed on the top surface of the base plate 3. The extended end of the electric push rod is fixed to the outer wall of the lifting sleeve. By driving the electric push rod to retract, the lifting sleeve is driven to descend. The push bars pull the four centering blocks 4 to slide along the sliding grooves 101 towards the side closer to the axis of the centering base 1, thereby achieving the centering and positioning effect of the parts.

[0018] A threaded hole 401 is provided at the upper end of the centering block 4. The axis of the threaded hole 401 is perpendicular to the axis of the centering base 1. A screw 5 is connected to the threaded hole 401. A pressure sensor 7 is fixed at the end of the screw 5 close to the axis of the centering base 1. A knob 6 is fixed at the end of the screw 5 away from the pressure sensor 7. The knob 6 is set in a flat cylindrical shape, and anti-slip textures are evenly spaced on its circumferential outer wall. When the four centering blocks 4 are driven to move closer together for centering and positioning, after centering is completed, the pressure sensor 7 presses against the outer wall of the positioned part. When the pressure value is greater than the set value, it indicates that the positioning is completed. Then the electric push rod extends to expand the four centering blocks 4.

[0019] This mechanical centering and positioning structure inevitably wears down with repeated use, leading to centering and positioning deviations. The connection between the pressure sensor 7 and the centering block 4 is achieved through the screw 5 and threaded hole 401. This allows the distance between the pressure sensor 7 and the centering block 4 to be adaptively adjusted after wear occurs, ensuring accurate centering and positioning of the parts. To guarantee accuracy during adjustment, four adjustment blocks 8 are equidistantly spaced around the centering base 1 along its axis. The positions of the four adjustment blocks 8 are fixed, allowing only lifting. Each adjustment block 8 faces a pressure sensor 7. After driving the four pressure sensors 7 together, rotating the knob 6 (the anti-slip texture increases friction and facilitates rotation) causes the screw 5 to rotate, pushing the pressure sensors 7 closer to the adjustment blocks 8 until they contact the outer wall of the adjustment blocks 8. This ensures that the pressure values ​​of the four pressure sensors 7 are adjusted to be consistent, completing the adjustment process and guaranteeing the accuracy of subsequent centering and positioning.

[0020] The adjustment block 8 is slidably mounted in the slide groove 101 near the axis of the centering base 1. Under normal conditions, the adjustment block 8 is submerged in the slide groove 101, with its lower end protruding from the bottom surface of the centering base 1. During adjustment, the adjustment block 8 protrudes to the top surface of the centering base 1 and faces the pressure sensor 7. A connecting rod 9 is fixed to the lower end of the adjustment block 8 near the axis of the centering base 1. A limiting sleeve 10 is fixed to one end of multiple connecting rods 9 near the axis of the centering base 1. The limiting sleeve 10 is also a spline sleeve and is slidably fitted on the outside of the support rod 2. By pushing the limiting sleeve 10 upward, the four adjustment blocks 8 can protrude from the top surface of the centering base 1 and face the pressure sensor 7, thus enabling the adjustment of the centering positioning structure.

[0021] A pin 11 is slidably inserted into the side wall of the limiting sleeve 10 through a sliding hole. The axis of the pin 11 is perpendicular to the axis of the limiting sleeve 10. The end of the pin 11 near the support rod 2 is hemispherical. A convex ring 12 is formed on the outer side of the end of the pin 11 away from the support rod 2. A spring 13 is sleeved on the end of the pin 11 near the convex ring 12. One end of the spring 13 is fixed to the outer wall of the convex ring 12, and the other end is fixed to the outer wall of the limiting sleeve 10. Under the action of the spring 13, the pin 11 always has a tendency to slide towards the side closer to the support rod 2. Two slots 14 are opened from top to bottom on the upper end of the support rod 2. The positions of the slots 14 correspond to the positions of the pins 11.

[0022] Under normal conditions, the end of the pin 11 abuts against the lower slot 14. During debugging, the end of the pin 11 abuts against the upper slot 14. This achieves the limitation of the position of the limiting sleeve 10, thus completing the fixation of the position of the debugging block 8 under normal conditions and during testing. When it is necessary to switch it from the normal state to the testing state, pull the two opposing debugging blocks 8 upwards, so that the pin 11 overcomes the elastic force of the spring 13 and slides out of the slot 14 until the pin 11 is aligned with the upper slot 14 and inserted, so that the debugging block 8 protrudes from the top surface of the centering base 1.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A centering and positioning mechanism, comprising a centering base (1), wherein the centering base (1) is provided with a plurality of sliding grooves (101) spaced at equal angles around its axis, and a centering block (4) is slidably connected within the sliding grooves (101), characterized in that, A pressure sensor (7) is installed on the side of the centering block (4) near the centering base (1) via a linear adjustment assembly. The linear adjustment assembly is used to adjust the distance between the pressure sensor (7) and the centering block (4). The slide (101) has a liftable adjustment block (8) at one end near the axis of the centering base (1). Under normal conditions, the adjustment block (8) is submerged in the slide (101). During adjustment, the adjustment block (8) protrudes to the top surface of the centering base (1) and faces the pressure sensor (7).

2. The centering mechanism of claim 1, wherein, The linear adjustment assembly includes a threaded hole (401) on the upper end of the centering block (4), the axis of the threaded hole (401) is perpendicular to the axis of the centering base (1), a screw (5) is threaded into the threaded hole (401), a pressure sensor (7) is fixed to the end of the screw (5), and a knob (6) is fixed to the end of the screw (5) away from the pressure sensor (7).

3. The centering mechanism of claim 2, wherein, The knob (6) is set in a flat cylindrical shape, and its outer circumferential wall is provided with anti-slip texture at equal intervals.

4. The centering mechanism of claim 1, wherein, Under normal conditions, the lower end of the debugging block (8) protrudes from the bottom surface of the centering base (1).

5. The centering mechanism of claim 4, wherein, The lower end of the debugging block (8) is fixed with a connecting rod (9) near the axis of the centering base (1). Multiple connecting rods (9) are fixed with a limiting sleeve (10) at one end near the axis of the centering base (1). The limiting sleeve (10) is slidably sleeved on the outside of the support rod (2) at the center of the bottom surface of the centering base (1). The limiting sleeve (10) is provided with a positioning component, which is used to limit the position of the limiting sleeve (10) and the support rod (2).

6. The centering mechanism of claim 5, wherein, The limiting sleeve (10) is a spline sleeve, and the support rod (2) is a spline shaft.

7. The centering mechanism of claim 5, wherein, The positioning component includes a pin (11) that is slidably inserted into the side wall of the limiting sleeve (10) through a sliding hole. The axis of the pin (11) is perpendicular to the axis of the limiting sleeve (10). The end of the pin (11) near the support rod (2) is hemispherical. A convex ring (12) is formed on the outer side of the end of the pin (11) away from the support rod (2). A spring (13) is sleeved on the end of the pin (11) near the convex ring (12). One end of the spring (13) is fixed to the outer wall of the convex ring (12), and the other end is fixed to the outer wall of the limiting sleeve (10). Under the action of the spring (13), the pin (11) always has a tendency to slide towards the side closer to the support rod (2). Two slots (14) are opened from top to bottom on the upper end of the support rod (2). The positions of the slots (14) correspond to the positions of the pins (11).

8. The centering mechanism of claim 7, wherein, Normally, the end of the pin (11) abuts against a slot (14) below, and during debugging, the end of the pin (11) abuts against a slot (14) above.

Images