Space-saving spiral pull rod structure

Abstract

The utility model relates to a pull rod structure, in particular to a space-saving spiral pull rod structure. The spiral pull rod structure comprises a fixed pipe, a push rod, a fixed supporting assembly, a sliding supporting assembly, a transmission lead screw and a driving assembly, one end of the fixed pipe is open, the other end of the fixed pipe is provided with a shielding block, the push rod is sleeved with the fixed pipe, and the center axis of the fixed pipe and the center axis of the push rod are located on the same axis. The fixed supporting assembly is arranged at the end, close to the opening, of the outer circle face of the push rod, the sliding supporting assembly is arranged at the end, close to the shielding block, of the outer circle face of the push rod, one end of the push rod extends out of the opening of the fixed pipe, and the push rod is in threaded connection with a transmission lead screw. An inner needle roller thrust bearing and an outer needle roller thrust bearing are arranged on the inner side face and the outer side face of the shielding block respectively, and the transmission lead screw is rotationally connected into the inner needle roller thrust bearing and the outer needle roller thrust bearing. The spiral pull rod structure is small in occupied space, high in transmission precision and convenient to mount and dismount.

Description

Technical Field

[0001] The utility model relates to a pull rod structure, in particular to a space-saving spiral pull rod structure. Background Art

[0002] In the field of modern mechanical engineering, screw transmission mechanisms are widely used in many devices because they can accurately convert rotational motion into linear motion. Traditional screw transmission mechanisms have some shortcomings in practical applications, such as complex structure, large space occupation, limited transmission accuracy, and low efficiency.

[0003] With the rapid development of automation, the performance requirements for transmission mechanisms are increasing, including higher precision, smaller space occupation, more efficient transmission and more stable operation. To meet these requirements, the design of new screw transmission mechanisms has become a research hotspot, aiming to optimize the structure and improve the performance to adapt to a wider and more complex application scenarios. Utility Model Content

[0004] In order to overcome the above-mentioned defects, the purpose of the utility model is to provide a space-saving spiral pull rod structure, which occupies a small space, has high transmission accuracy, and is easy to install and disassemble.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A space-saving spiral pull rod structure comprises a fixed tube, a push rod, a fixed support assembly, a sliding support assembly, a transmission screw and a driving assembly. One end of the fixed tube is open, and a blocking block is arranged at the other end. A push rod is sleeved in the fixed tube, and the central axes of the fixed tube and the push rod are located on the same axis. The fixed support assembly is arranged on the outer cylindrical surface of the push rod close to the open end, and the sliding support assembly is arranged on the outer cylindrical surface of the push rod close to the blocking block end. One end of the push rod extends to the outside of the opening of the fixed tube. The push rod is threadedly connected with a transmission screw, and one end of the transmission screw passes through the blocking block and is connected to the driving assembly. An inner thrust needle roller bearing and an outer thrust needle roller bearing are respectively arranged on the inner and outer side surfaces of the blocking block, and the transmission screw is rotatably connected in the inner thrust needle roller bearing and the outer thrust needle roller bearing.

[0007] Preferably, the inner thrust needle roller bearing abuts against the support surface of the transmission screw, and a fixing nut is threadedly connected to the transmission screw, and the fixing nut abuts against the outer thrust needle roller bearing.

[0008] Preferably, the fixed support assembly comprises two groups of hole elastic retaining rings arranged in the fixed tube and a fixed support sleeve clamped between the two groups of hole elastic retaining rings, and the push rod passes through the hole elastic retaining ring and the fixed support sleeve.

[0009] Preferably, the sliding support assembly comprises a sliding support sleeve and an elastic retaining ring for the shaft, which are arranged on the outer cylindrical surface of the push rod. The elastic retaining ring for the shaft is arranged on the push rod, and the sliding support sleeve is engaged between the step surface at one end of the push rod close to the shielding block and the elastic retaining ring for the shaft.

[0010] Preferably, the driving assembly includes a driving shaft fixedly connected to the transmission screw, and a hand crank or a rotating motor arranged on the driving shaft.

[0011] Preferably, a transverse oil injection channel is opened at the central axis position of the transmission screw, and a longitudinal oil injection channel is correspondingly arranged at both ends of the transverse oil injection channel and between the two thrust needle roller bearings, and a grease nipple is connected to the longitudinal oil injection channel near one end of the drive assembly.

[0012] Preferably, a lug plate is arranged outside the fixed pipe.

[0013] The positive and beneficial effects of the utility model:

[0014] 1. The spiral pull rod structure of the utility model comprises a fixed tube, a push rod, a fixed support assembly, a sliding support assembly, a transmission screw and a driving assembly. The fixed tube supports the fixed support sleeve and the sliding support sleeve to ensure that the push rod can move along a straight line, and together with the inner thrust needle roller bearing and the outer thrust needle roller bearing, the transmission screw position is limited so that the transmission screw can smoothly realize rotational movement relative to the fixed tube. One end of the transmission screw is connected to the driving assembly, and the other end is threadedly connected to the push rod, so that the transmission screw and the threaded part of the push rod form a thread pair. The push rod is limited by the actuator and does not make circumferential rotational movement. When the driving assembly drives the transmission screw to rotate, it pushes the push rod to move forward or backward, thereby realizing the transmission function of the spiral pull rod in a limited space, occupying a small space, having high transmission accuracy, and having a simple structure, and convenient installation and disassembly of various components. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the spiral pull rod of the utility model;

[0016] Figure 2 This is a schematic diagram of the push rod structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the transmission screw structure of the utility model;

[0018] In the figure: 1-fixed tube, 2-push rod, 3-transmission screw, 4-drive shaft, 5-blocking block, 6-inner thrust needle roller bearing, 7-outer thrust needle roller bearing, 8-fixing nut, 9-fixing support sleeve, 10-elastic retaining ring for hole, 11-sliding support sleeve, 12-elastic retaining ring for shaft, 13-butter nipple, 14-ear plate, 15-step surface, 16-transverse oil injection channel, 17-longitudinal oil injection channel, 18-support surface. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with some specific embodiments.

[0020] See also Figure 1-3 A space-saving spiral pull rod structure includes a fixed tube 1, a push rod 2, a fixed support assembly, a sliding support assembly, a transmission screw 3 and a driving assembly. One end of the fixed tube 1 is open, and a blocking block 5 is arranged at the other end. The blocking block 5 is integrally formed with the fixed tube 1. The fixed tube 1 is sleeved with the push rod 2. The central axes of the fixed tube and the push rod are located on the same axis. The fixed tube 1 is also provided with a fixed support assembly and a sliding support assembly. The fixed support assembly is arranged on the outer circumferential surface of the push rod near the open end, and the sliding support assembly is arranged on the outer circumferential surface of the push rod near the blocking block end. One end of the push rod 2 extends to the fixed tube The open end is connected to the actuated mechanism to prevent it from rotating. An internal thread is arranged at one end of the push rod 2 near the shielding block 5, and an external thread matching the internal thread is arranged on the outer wall of the transmission screw 3. The push rod 2 is threadedly connected to the transmission screw 3. The transmission screw 3 and the internal thread of the push rod 2 form a transmission pair. The push rod is pushed to realize linear motion through the rotational movement of the transmission screw. One end of the transmission screw 3 passes through the shielding block 5 and is connected to the driving assembly. The inner and outer sides of the shielding block 5 are respectively provided with an inner thrust needle roller bearing 6 and an outer thrust needle roller bearing 7. The transmission screw 3 is rotatably connected in the inner thrust needle roller bearing 6 and the outer thrust needle roller bearing 7. The inner thrust needle roller bearing 6 and the outer thrust needle roller bearing 7 bear the axial thrust transmitted from the push rod 2 to the transmission screw 3, reduce the rotational resistance of the transmission screw 3, and play a supporting and positioning role for the transmission screw 3.

[0021] Furthermore, the inner thrust needle roller bearing 6 abuts against the transmission screw support surface 18, and the transmission screw 3 is also threadedly connected with a fixing nut 8, two fixing nuts 8 are provided, and the inner fixing nut 8 abuts against the outer thrust needle roller bearing 7. The fixing nut 8 further limits the axial movement of the transmission screw 3 relative to the fixed tube 1, and the axial clearance of the thrust needle roller bearing can be adjusted through the two fixing nuts, so that the transmission screw 3 can rotate flexibly and achieve self-locking.

[0022] Furthermore, the fixed support assembly includes two sets of hole elastic circlips 10 fixed in the fixed tube 1 and a fixed support sleeve 9 clamped between the two sets of hole elastic circlips 10, and the push rod 2 passes through the hole elastic circlips 10 and the fixed support sleeve 9. The hole elastic circlips limit the fixed support sleeve to prevent the fixed support sleeve from moving relative to the fixed tube. The fixed support sleeve is installed at the end of the fixed tube to support the push rod to translate smoothly without bending.

[0023] Furthermore, the sliding support assembly includes a sliding support sleeve 11 and a shaft elastic circlip 12 arranged on the outer circumferential surface of the push rod 2, the shaft elastic circlip 12 is fixed to the push rod 2, and the sliding support sleeve 11 is engaged between the step surface 15 at one end of the push rod close to the shielding block and the shaft elastic circlip 12. The shaft elastic circlip and the step surface of the push rod jointly limit the sliding support sleeve relative to the push rod. The sliding support sleeve supports the rear end of the push rod and forms a straight line with the fixed support sleeve, supporting the push rod so that the push rod does not move radially during the entire linear motion process, and also ensures that the transmission screw does not bend.

[0024] Furthermore, the driving assembly includes a driving shaft 4 fixedly connected to the transmission screw 3, and a hand crank or a rotary motor arranged on the driving shaft 4. The driving shaft is rigidly connected to one end of the transmission screw by an elastic cylindrical pin, and the driving shaft is driven to rotate by the hand crank or the rotary motor, and the driving shaft rotates to drive the transmission screw to rotate.

[0025] Furthermore, a transverse oil injection channel 16 is provided at the central axis of the transmission screw, and a longitudinal oil injection channel 17 is provided at both ends of the transverse oil injection channel 16 and between the two thrust needle roller bearings, and a grease nipple 13 is connected to the longitudinal oil injection channel near one end of the driving component. Oil is injected through the grease nipple 13 to lubricate the thrust needle roller bearing and the screw transmission pair.

[0026] Furthermore, a lug plate 14 is arranged outside the fixed pipe 1. The lug plate 14 is used to fix the spiral pull rod structure of the utility model on the external equipment.

[0027] The method for using the space-saving spiral pull rod structure of the utility model is as follows: first, an inner thrust needle roller bearing is installed on the transmission screw, and then installed into the fixed tube and passed through the blocking block, and the other end is installed with an outer thrust needle roller bearing and a fixing nut in sequence, and then a sliding support sleeve and an elastic retaining ring for the shaft are installed on the push rod, and threadedly connected with the transmission screw, and finally an elastic retaining ring for the hole and a fixed support sleeve are installed, a driving assembly is installed on the transmission screw, and the actuator is connected to the push rod, and the disassembly process is the opposite of the above steps.

[0028] The fixed tube is fixed to the external equipment through the ear plate, and the driving assembly drives the driving shaft to rotate, thereby driving the transmission screw to make circumferential rotational motion relative to the fixed tube. The other end of the transmission screw is threadedly connected to the push rod, and the other end of the push rod is connected to the actuator. The push rod is limited by the actuator and does not make circumferential rotational motion, so that the transmission screw and the threaded part of the push rod form a thread pair. When the transmission screw rotates, it pushes the push rod to move forward or backward.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A space-saving spiral pull rod structure, characterized in that: The invention comprises a fixed tube (1), a push rod (2), a fixed support assembly, a sliding support assembly, a transmission screw (3) and a driving assembly. One end of the fixed tube (1) is open, and the other end is provided with a blocking block (5). The fixed tube (1) is sleeved with a push rod (2). The central axes of the fixed tube (1) and the push rod (2) are located on the same axis. The fixed support assembly is arranged at the end of the outer cylindrical surface of the push rod (2) close to the open end. The sliding support assembly is arranged at the end of the outer cylindrical surface of the push rod (2) close to the blocking block (5). One end of the push rod (2) extends outside the open end of the fixed tube. The push rod (2) is threadedly connected with a transmission screw (3). One end of the transmission screw (3) passes through the blocking block (5) and is connected to the driving assembly. An inner thrust needle roller bearing (6) and an outer thrust needle roller bearing (7) are respectively arranged on the inner and outer side surfaces of the blocking block (5). The transmission screw (3) is rotatably connected in the inner thrust needle roller bearing (6) and the outer thrust needle roller bearing (7).

2. The space-saving spiral tie rod structure according to claim 1, characterized in that: The inner thrust needle roller bearing (6) abuts against the transmission screw support surface (18), and a fixing nut (8) is also threadedly connected to the transmission screw (3), and the fixing nut (8) abuts against the outer thrust needle roller bearing (7).

3. The space-saving spiral tie rod structure according to claim 2, characterized in that: The fixed support assembly comprises two groups of hole elastic retaining rings (10) arranged in the fixed tube (1) and a fixed support sleeve (9) clamped between the two groups of hole elastic retaining rings (10), and the push rod (2) passes through the hole elastic retaining ring (10) and the fixed support sleeve (9).

4. The space-saving spiral tie rod structure according to claim 3, characterized in that: The sliding support assembly comprises a sliding support sleeve (11) arranged on the outer cylindrical surface of the push rod (2) and a shaft elastic retaining ring (12); the shaft elastic retaining ring (12) is arranged on the push rod (2); the sliding support sleeve (11) is engaged between a step surface (15) at one end of the push rod (2) close to the shielding block (5) and the shaft elastic retaining ring (12).

5. The space-saving spiral tie rod structure according to claim 4, characterized in that: The driving assembly comprises a driving shaft (4) fixedly connected to the transmission screw (3), and a hand crank or a rotating motor arranged on the driving shaft (4).

6. The space-saving spiral tie rod structure according to any one of claims 1 to 5, characterized in that: A transverse oil injection channel (16) is provided at the central axis of the transmission screw, and a longitudinal oil injection channel (17) is provided at both ends of the transverse oil injection channel (16) and between the two thrust needle roller bearings, respectively. A grease nipple (13) is connected to the longitudinal oil injection channel near one end of the drive assembly.

7. The space-saving spiral tie rod structure according to claim 6, characterized in that: A lug plate (14) is arranged outside the fixed tube (1).

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