Push rod sliding assembly and linear driving module using same

Abstract

The utility model discloses a push rod sliding assembly and a linear driving module using the same, and the push rod sliding assembly comprises a sliding seat which is provided with a through hole penetrating through a pair of corresponding side end walls; an internal thread part is formed at one end of the through hole; at least one limiting hole vertically connected with the internal thread part is also formed in the sliding seat; the push rod is provided with a hollow cavity penetrating through the two shaft side ends of the push rod, an external thread connecting part suitable for being connected with the internal thread part is pre-arranged on the outer side wall of one end of the push rod, and at least one limiting groove matched with the limiting hole is further formed in the side wall of the external thread connecting part; and the at least one limiting piece is suitable for penetrating through the limiting hole and then abutting against the limiting groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to transmission technical field especially, it relates to a push rod sliding assembly and use its linear drive module. BACKGROUND

[0002] The electric cylinder in the linear drive module is the equipment that turns the rotation of servo motor into linear motion, the motor drives the ball screw to rotate after deceleration transmission, the ball nut converts the rotation of ball screw into linear motion, and the push rod outputs thrust and pull force, and the best advantages of servo motor - accurate speed control, accurate number of revolutions control, accurate torque control are changed into accurate speed control, accurate position control and accurate thrust control.

[0003] For the push rod in the linear drive module, the prior art generally matches it with the screw nut, for example, the electric cylinder split type nut push rod structure disclosed in the announcement no. CN218152215U, and for example, the fixed shaft type screw motor disclosed in the announcement no. CN207218450U, this kind of mode can fix the push rod, but for the screw nut, it needs to realize linear motion through the precise matching with the screw rod. Based on this, the structure for matching the push rod is processed and formed on the screw nut, on the one hand, the machining difficulty is great, and the matching precision of the screw nut and the screw rod may be affected; on the other hand, there is a large gap between the screw nut and the guide rail, so that the radial swing of the push rod is large. Therefore, the announcement no. CN215733868U discloses a high-load high-rigidity torsion electric cylinder, the push rod in which is connected with the sliding seat, so that the machining difficulty of the screw nut is reduced.

[0004] Based on the above situation, the push rod is not directly matched with the screw nut, so the matching precision between the push rod and the sliding seat directly affects the running precision of the push rod, that is, if there is a radial gap between the sliding seat and the push rod, it will directly cause the radial swing of the push rod during running. Therefore, for the matching mode between the push rod and the sliding seat in the above situation, it is also necessary to simultaneously consider the problems of reducing the machining difficulty and improving the matching precision between the push rod and the sliding seat. UTILITY MODEL CONTENTS

[0005] The first object of the utility model is to provide a push rod sliding assembly to solve the technical problem of considering reducing the machining difficulty and improving the matching precision between the push rod and the sliding seat.

[0006] The second object of the utility model is to provide a linear drive module to solve the technical problem of considering reducing the machining difficulty and improving the running precision of the push rod.

[0007] The push rod sliding assembly of the utility model is realized as follows:

[0008] A push rod sliding assembly, comprising:

[0009] A sliding seat having a through hole passing through a pair of corresponding side end walls thereof, an internally threaded portion being formed at one end of the through hole, and at least one limiting hole being provided in the sliding seat and being connected perpendicularly to the internally threaded portion;

[0010] A push rod having a hollow cavity passing through two shaft side ends thereof, and an externally threaded connecting portion being provided on an outer side wall of one end of the push rod and being adapted to be connected to the internally threaded portion, at least one limiting groove being further provided on a side wall of the externally threaded connecting portion and being adapted to cooperate with the limiting hole;

[0011] At least one limiting member being adapted to abut against the limiting groove after penetrating through the limiting hole.

[0012] In an optional implementation of the present application, the limiting member cooperates with the limiting hole in a clearance fit.

[0013] In an optional implementation of the present application, the limiting member is adapted to cooperate with the limiting hole in a threaded fit.

[0014] In an optional implementation of the present application, the limiting member is further adapted to be reinforced in the limiting hole by glue.

[0015] In an optional implementation of the present application, the externally threaded connecting portion is provided with two limiting grooves which are symmetrically arranged with respect to the shaft center of the push rod; and

[0016] The sliding seat is provided with two limiting holes which one-to-one cooperate with the two limiting grooves;

[0017] Each of the limiting holes is adapted to cooperate with one limiting member.

[0018] The linear driving module of the present application is realized as follows:

[0019] A linear driving module, comprising: the push rod sliding assembly, a screw nut provided in the through hole of the sliding seat, and a screw rod cooperating with the screw nut; wherein

[0020] The screw rod is adapted to partially penetrate through the through hole and extend into the hollow cavity of the push rod;

[0021] The screw rod is further connected to a motor assembly at an end thereof away from the push rod.

[0022] In an optional implementation of the present application, the screw nut is a backlash-free nut.

[0023] In an optional implementation of the present application, the linear driving module further comprises a linear ball sliding rail and sliding block structure connected to the sliding seat.

[0024] In optional implementation of the utility model, the linear driving module further comprises an adapter plate in sliding fit with the push rod.

[0025] The adapter plate is provided with a sliding sleeve in sliding fit with the push rod.

[0026] In optional implementation of the utility model, the push rod is provided with an adapter at one end away from the sliding seat.

[0027] The utility model has the advantages that: the push rod sliding assembly and the linear driving module using the same of the utility model are directly connected with the sliding seat, thereby avoiding the problem of great machining difficulty and possible influence on the cooperation precision of the screw rod nut and the screw rod caused by direct connection of the screw rod nut and the push rod. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a whole structure schematic view of the linear driving module of the utility model;

[0029] Figure 2 It is an internal structure schematic view of the linear driving module of the utility model;

[0030] Figure 3 It is an exploded structure schematic view of the linear driving module of the utility model;

[0031] Figure 4 It is a local structure schematic view of the linear driving module of the utility model Figure 1 ;

[0032] Figure 5 It is a local structure schematic view of the linear driving module of the utility model Figure 2 ;

[0033] Figure 6 It is a sectional structure schematic view of the linear driving module of the utility model.

[0034] In the figure: push rod 1, hollow cavity 11, external thread connection part 12, adapter 13, limiting groove 14, sliding seat 2, through hole 21, internal thread part 22, limiting hole 23, limiting piece 3, screw rod 4, screw rod nut 5, plastic nut 51, flange nut 52, motor assembly 6, linear ball sliding rail slider structure 7, adapter plate 81, bottom plate 82, motor mounting plate 83, cover 84, sliding sleeve 9. DETAILED DESCRIPTION

[0035] In order to make the content of the utility model more easily be clearly understood, the following according to specific embodiment and combining with the drawings, the utility model is further explained in detail.

[0036] Embodiment 1:

[0037] Please refer to Figures 1 to 6 As shown in the figure, the embodiment provides a push rod sliding assembly, comprising: the sliding seat 2 and the push rod 1 used in cooperation, the push rod 1 can move synchronously with the sliding seat 2, in order to ensure that the push rod 1 running track is accurate and reliable, then need to ensure that the push rod 1 and the sliding seat 2 form accurate cooperation, thereby to prevent the push rod 1 from swinging or shaking along its axial and / or radial during operation. For this, the embodiment is designed as follows:

[0038] First, the sliding seat 2, combining with the drawings, taking the cuboid structure as an example, is convenient for processing. A pair of corresponding side end walls extending to the through hole 21 along the axial direction of the push rod 1 is formed in the cuboid-shaped sliding seat 2. One end of the through hole 21 along the axial direction of the push rod 1 is formed with an internal thread part 22 for connecting with the push rod 1, and at least one limiting hole 23 perpendicular to the internal thread part 22 is further provided in the sliding seat 2, and each limiting hole 23 extends to the side end surface of the sliding seat 2 perpendicular to the axial direction of the push rod 1.

[0039] Here, combining with the drawings, an optional case is taken as an example, two limiting holes 23 are arranged in the sliding seat 2, which are symmetrically arranged relative to the axis of the push rod 1, the two limiting holes 23 are respectively communicated with the through hole 21, and the connecting line between the two limiting holes 23 is preferably perpendicular to the axis of the push rod 1, which has low processing difficulty.

[0040] Secondly, the push rod 1 has a hollow cavity 11 through both axial side ends, and the outer side wall of one end of the push rod 1 is provided with an external thread connection part 12 suitable for connecting with the internal thread part 22, and at least one limiting groove 14 matched with the limiting hole 23 is further provided on the side wall of the external thread connection part 12; that is, one limiting hole 23 corresponds to one limiting groove 14, when the external thread connection part 12 is matched with the internal thread part 22 in place, the connecting hole is just matched with the limiting groove 14, and at this time, the limiting piece 3 is penetrated through the limiting hole 23 and abuts against the limiting groove 14. In this way, the cooperation of the push rod 1 and the sliding seat 2 is reliable in both axial and radial directions of the push rod 1.

[0041] Based on the above, it should be noted that the cooperation between the limiting piece 3 and the limiting hole 23: the optional case is that the limiting piece 3 and the limiting hole 23 are clearance fit. The optional case is that the limiting piece 3 is suitable for threaded cooperation with the limiting hole 23. For the above two cooperation modes, the limiting piece 3 and the limiting hole 23 can be reinforced by glue, so as to ensure that the limiting piece 3 and the limiting groove 14 form reliable and stable abutting cooperation.

[0042] In summary, for the cooperation between the sliding seat 2 and the push rod 1 of the embodiment, the limiting piece 3 is combined by threaded cooperation, so that the push rod 1 and the sliding seat 2 form reliable cooperation in the radial direction and the axial direction along the push rod 1, thereby preventing the push rod 1 from swinging in the axial direction or the radial direction during the movement of the sliding seat 2, thereby improving the accuracy of the operation process of the push rod 1.

[0043] Embodiment 2:

[0044] Please refer to Figures 1 to 5 On the basis of the push rod sliding assembly of embodiment 1, the linear driving module provided by the embodiment comprises the push rod sliding assembly of embodiment 1, a screw nut 5 arranged in the through hole 21 of the sliding seat 2, and a lead screw 4 cooperating with the screw nut 5. The lead screw 4 is adapted to partially penetrate the through hole 21 and extend into the hollow cavity 11 of the push rod 1. The end of the lead screw 4 away from the push rod 1 is also connected with a motor assembly 6. As for the motor assembly 6, any mature means in the prior art can be selected as long as it can drive the lead screw 4 to rotate. The specific structure of the motor assembly 6 is not absolutely limited in the embodiment.

[0045] Based on the above, in addition, the screw nut 5 and the sliding seat 2 are fixedly assembled together, so that the sliding seat 2 can move synchronously with the screw nut 5. The cooperation between the screw nut 5 and the sliding seat 2 can be connected by means of, for example but not limited to, a screw. When the lead screw 4 rotates under the action of the motor, the sliding seat 2 and the screw nut 5 move along the axial direction of the lead screw 4, thereby driving the push rod 1 connected with the sliding seat 2 to move along the axial direction of the lead screw 4, so as to output the pushing force and the pulling force through the push rod 1.

[0046] On the basis of the above structure, it needs to be explained that in order to improve the accuracy of the axial movement trajectory of the screw nut 5 along the screw rod 4, prevent the gap between the screw nut 5 and the screw rod 4 due to wear during long-term use, and affect the accuracy of the output thrust and pulling force process of the push rod 1, the screw nut 5 of the embodiment adopts a backlash nut, which can adopt a backlash nut disclosed in the prior art such as but not limited to the disclosed backlash nut with the announcement number CN217842560U or the torsional spring backlash nut with the announcement number CN211398465U. The specific structure and implementation principle of the embodiment are not absolutely limited. Roughly speaking, the backlash nut here includes a plastic nut 51, a flange nut 52, and an elastic assembly arranged between the plastic nut 51 and the flange nut 52; the plastic nut 51 is built into the sliding seat 2, and the flange nut 52 is located outside the sliding seat 2, and one side end of the flange nut 52 abuts against the side end wall of the sliding seat 2 facing the motor assembly 6. In this case, the flange nut 52 is fixed to the sliding seat 2 by screws, thereby realizing the fastening cooperation between the entire screw nut 5 and the sliding seat 2.

[0047] In addition, it also needs to be explained that the linear driving module of the embodiment further includes a linear ball slide rail slider structure 7 connected with the sliding seat 2. As for the linear ball slide rail slider structure 7 here, any mature means in the prior art can be selected, such as but not limited to the linear ball slide rail with four rows of steel balls disclosed in the announcement number CCN2307653Y, and the specific structure and implementation principle of the embodiment is not absolutely limited. By adopting the linear ball slide rail slider structure 7 here, the sliding precision is high, and the sliding seat 2 is not easy to produce unintended swinging along the radial direction of the push rod 1 when driving the push rod 1 to move.

[0048] It also needs to be explained that in order to reliably transmit the thrust and pulling force of the push rod 1, an adapter 13 is arranged at the end of the push rod 1 away from the sliding seat 2, which is used to cooperate with the force receiving end, thereby realizing the reliable cooperation between the push rod 1 and the force receiving end.

[0049] Finally, for the operation process of the push rod 1, the end matched with the sliding seat 2 cannot support the reliable operation of the whole push rod 1, therefore, the linear driving module of the embodiment further comprises an adapter plate 81 matched with the push rod 1; the adapter plate 81 is preformed with a sliding sleeve 9 matched with the push rod 1, the sliding sleeve 9 can be made of, for example, but not limited to, plastic, which can form the sliding match between the push rod 1 and reduce the noise and abrasion of the outer surface of the push rod 1 during the sliding process. Based on this, it is also necessary to point out that the linear ball sliding rail sliding block structure 7 of the embodiment is fixed on a bottom plate 82, the adapter plate 81 is connected with the bottom plate 82 vertically, and the motor mounting plate 83 is vertically connected at the end of the bottom plate 82 away from the adapter plate 81 to realize the fixation of the motor assembly 6, and the screw rod 4 is connected with the motor assembly 6 after penetrating the motor mounting plate 83.

[0050] Based on the above situation, and based on the protection of the sliding seat 2 and the linear ball sliding rail sliding block structure 7, the dust and impurities during long-term use are prevented, the bottom plate 82 is further provided with a cover 84, and the sliding seat 2 and the linear ball sliding rail sliding block structure 7 are arranged in the accommodating interval formed by the cover 84 and the bottom plate 82.

[0051] In summary, through the cooperation of the anti-backlash nut and the linear ball sliding rail sliding block structure 7, the cooperation precision of the screw rod nut 5 and the screw rod 4, and the accuracy of the movement track of the sliding seat 2 during the movement process of the screw rod nut 5 are fully ensured.

[0052] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above is only a specific embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0053] In the description of the utility model, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation of the utility model.

[0054] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication or two element mutual action relationship.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned terms in the utility model according to specific circumstances.

[0055] In the description of the utility model, it is to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on is based on the orientation or position relationship shown in the drawing, or the orientation or position relationship of the utility model product when it is usually placed, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.In addition, the terms "first", "second", "third" and so on are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0056] In addition, the terms "horizontal", "vertical", "overhang" and so on do not mean that the component must be absolutely horizontal or overhanging, but can be slightly inclined.For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0057] In the utility model, unless another definite provision and limitation, the first feature above or below the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.Furthermore, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature.The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A push rod sliding assembly, characterized in that, include: A sliding seat has through holes penetrating a pair of corresponding side end walls; an internal thread is formed at one end of the through hole; and at least one limiting hole is provided in the sliding seat that is perpendicularly connected to the internal thread. A push rod has a hollow cavity extending through its two axial ends, and the outer side wall of one end of the push rod is pre-set with an external threaded connection part suitable for connecting with an internal threaded part. The side wall of the external threaded connection part is also provided with at least one limiting groove that mates with a limiting hole. At least one limiting element is adapted to abut against the limiting groove after passing through the limiting hole.

2. The push rod sliding assembly according to claim 1, characterized in that, The limiting member is clearance-fitted with the limiting hole.

3. The push rod sliding assembly according to claim 1, characterized in that, The limiting element is adapted to engage with the threaded limiting hole.

4. The push rod sliding assembly according to claim 2 or 3, characterized in that, The limiting member is also suitable for being reinforced in the limiting hole with adhesive.

5. The push rod sliding assembly according to claim 1 or 2, characterized in that, The external threaded connection portion is provided with two limiting grooves symmetrically arranged relative to the axis of the push rod; and The sliding seat is provided with two limiting holes that cooperate one-to-one with the two limiting grooves; Each of the aforementioned limiting holes is adapted to a limiting element.

6. A linear drive module, characterized in that, include: The push rod sliding assembly as described in any one of claims 1 to 5, the lead screw nut disposed in the through hole of the sliding seat, and the lead screw that cooperates with the lead screw nut; in The lead screw is adapted to extend into the hollow cavity of the push rod after partially penetrating the through hole; The end of the lead screw away from the push rod is also connected to the motor assembly.

7. The linear drive module according to claim 6, characterized in that, The lead screw nut is a backlash-free nut.

8. The linear drive module according to claim 6 or 7, characterized in that, The linear drive module also includes a linear ball bearing slide rail slider structure connected to the sliding seat.

9. The linear drive module according to claim 6, characterized in that, The linear drive module also includes an adapter plate that slides with the push rod; The adapter plate is pre-installed with a sliding sleeve for sliding cooperation with the push rod.

10. The linear drive module according to claim 6 or 9, characterized in that, An adapter is provided at the end of the push rod away from the sliding seat.

Images