A protective mechanism for a rotating shaft during axial reciprocating swing

Abstract

The present invention discloses a protective mechanism for the axial reciprocating swing of a rotating shaft, wherein two rotating arms are fixed on a limiting shaft, the two limiting arms are respectively placed on one side of a rotating arm and are rotatably connected to the limiting shaft, the limiting surface is on the rotation path of the rotating surface on the rotating arm rotating around the axis of the limiting shaft, the slide is between the two limiting arms, the two sliders are arranged in parallel, and are fixed to the slide at different positions along the sliding direction by sliding, the two connecting blocks are respectively slidably connected to a limiting arm and are hinged with the sliders on the corresponding sides; the two sliders at different positions are respectively driven by the corresponding connecting blocks and the limiting arms so that the limiting surface on the limiting arm is at different circumferential positions when the rotating surface rotates. The position adjustment of the limiting arm in the present invention is achieved by sliding displacement, which is achieved by the transformation of linear and rotational motions, and has a wide adjustment range and is flexible to use.

Description

Technical field:

[0002] The invention relates to a protective mechanism for an axially reciprocating swing of a rotating shaft. Background technology:

[0004] When a mechanical reciprocating swinging structure based on a rotating shaft as the rotation center is in use, a limit protection structure is often provided at the extreme position of the swinging to prevent the swinging action from exceeding a limited range during the execution of the machine.

[0005] The existing limit protection structure generally fixes a limit block on the rotating shaft, and then sets two limit pins on the circumferential path of the limit block rotating along the axis of the rotating shaft, and the two limit pins are correspondingly located at the upper swing limit position and the lower swing limit position on the circumferential path of the limit block. When the limit block rotates to the position of the limit pin, it is limited by the limit pin to prevent the machine from moving beyond the range during the reciprocating swing process.

[0006] When this structure is in use, the position change of the limit pin is generally that a plurality of limit holes are provided on a preset rotation path (i.e., on the circumferential path of the above-mentioned limit block). When a certain position is required to be limited, the limit pin is threadedly connected to the hole at the corresponding position. The limit of this structure is limited by the position of the preset hole, that is, the final limited position can only be determined based on the position of the hole, so it has poor flexibility in use and a limited adjustment range. Summary of the invention:

[0008] The present invention aims to solve the problems existing in the prior art and provides a protection mechanism for the axial reciprocating swing of a rotating shaft.

[0009] The technical solutions adopted in the present invention include: a protection mechanism for the axial reciprocating swing of a rotating shaft, comprising a limit shaft, a slider, a slide, a connecting block, a rotating arm provided with a rotating surface and a limit arm provided with a limit surface, the two rotating arms are fixed on the limit shaft, the two limit arms are respectively placed on one side of a rotating arm and are rotatably connected to the limit shaft, the limit surface is on the rotation path of the rotating surface on the rotating arm rotating around the axis of the limit shaft, the slide is horizontally placed below the limit shaft and between the two limit arms, the two sliders are arranged in parallel and are fixed to different positions of the slide along the sliding direction by sliding, the two connecting blocks are respectively slidably connected to a limit arm and are hinged to the slider on the corresponding side; the two sliders at the different positions respectively transmit the corresponding connecting blocks and the limit arms so that the limit surface on the limit arm is at different circumferential positions when the rotating surface rotates.

[0010] Furthermore, the slide is provided with two tracks arranged parallel to each other, and the tracks and the axis of the limiting shaft are perpendicular to each other, two sliders are correspondingly slidably connected to the two tracks, and the sliders are fixed at different positions of the tracks by sliding.

[0011] Furthermore, a locking block is inserted on the slider, and the locking block is slidably connected to the track. A locking screw is threadedly connected to the slider, and the locking screw passes through the slider and abuts against the locking block, thereby abutting the locking block against the track.

[0012] Furthermore, the rotating arm is a circular block structure, a rectangular convex block is provided on the outer circumferential wall of the rotating arm, and one end surface of the convex block forms a rotating surface.

[0013] Furthermore, the limit arm is a strip plate structure, a limit block perpendicular to the limit arm is provided on the limit arm, the limit block is a rectangular structure, and a side surface of the limit block opposite to the rotating surface in the protrusion is a limit surface.

[0014] The present invention has the following beneficial effects:

[0015] The position adjustment of the limit arm in the present invention is achieved by sliding displacement, which is achieved by the transformation of linear and rotational motions. The adjustment range is wide and the use is flexible.

[0016] Two limit arms are provided, corresponding to the upper swing limit position and the lower swing limit position respectively. The two limit arms are independent of each other, flexible to use, can be adjusted and controlled individually, and are extremely convenient to use. Description of the drawings:

[0018] Figure 1 to Figure 4 This is a structural diagram of the present invention.

[0019] FIG. 5 is a structural diagram of the rotating arm and the limiting arm in the present invention.

[0020] FIG. 6 is a diagram of an application structure of the present invention.

[0021] Figure 7 shows Figure 6 Action diagram of the angle limiting structure for limiting the pedal from moving beyond a set range of motion.

[0022] FIG8 is another application structure diagram of the present invention. Specific implementation method:

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 5 The present invention discloses a protective mechanism for the axial reciprocating swing of a rotating shaft, comprising a limit shaft 31, a slider 34, a slide table 35, a connecting block 36, a rotating arm 32 provided with a rotating surface 321, and a limit arm 33 provided with a limit surface 331.

[0026] The two rotating arms 32 are fixed at both ends of the limiting shaft 31, and the rotating surfaces 321 on the two rotating arms 32 are arranged staggered with each other. The two limiting arms 33 are respectively placed on the inner side of one rotating arm 32, and the two limiting arms 33 are rotatably connected to the limiting shaft 31 through bearings. The limiting surface 331 on the limiting arm 33 is located on the rotation path of the rotating surface 321 on the corresponding rotating arm 32 rotating around the axis of the limiting shaft 31.

[0027] The slide 35 is horizontally placed below the limit shaft 31, and the slide 35 is between the two limit arms 33. The two sliders 34 are arranged in parallel, and the two sliders 34 are fixed at different positions of the slide 35 along the sliding direction by sliding. The two connecting blocks 36 are respectively slidably connected to a limit arm 33, and the two connecting blocks 36 are respectively hinged to the sliders 34 on the corresponding sides.

[0028] The two sliders 34 at different positions in the sliding direction of the slide table 35 are respectively driven by the connecting blocks 36 and the limiting arms 33 on the corresponding sides, so that the limiting surfaces 331 on the limiting arms 33 are at different circumferential positions when the rotating surface 321 rotates.

[0029] Two rails 351 arranged parallel to each other are provided on the slide 35 . The two rails 351 enable the two sliders 34 to slide. The direction of the rails 351 is the sliding direction of the sliders 34 .

[0030] The rail 351 and the axis of the limiting shaft 31 are perpendicular to each other. The two sliders 34 are correspondingly slidably connected to the two rails 351 , and the sliders 34 are fixed at different positions of the rails 351 by sliding.

[0031] After the slider 34 slides to a suitable position, in order to fix the position of the slider 34, a locking block 343 is inserted on the slider 34. The locking block 343 is an "H"-shaped structure. The slot at the upper end of the locking block 343 is mutually engaged with the slider 34. The slot at the lower end of the locking block 343 is slidably connected to the track 351. A locking screw 344 is threadedly connected to the slider 34. The locking screw 344 passes through the slider 34 and contacts the locking block 343, and contacts the locking block 343 to the track 351. Loosen the locking screw 344 to adjust the position of the slider 34 on the track 351.

[0032] To facilitate installation of the connection block 36 , a fixing plate 345 is fixed on the outer side of each slider 34 . The fixing plate 345 is arranged vertically, and the connection block 36 is hinged on the outer end face of the fixing plate 345 .

[0033] A sliding groove 368 is provided on the connecting block 36 , and a sliding bar 338 is provided on the limiting arm 33 . The sliding bar 338 is inserted into the sliding groove 368 to achieve a sliding connection between the limiting arm 33 and the connecting block 36 .

[0034] The rotating arm 32 is a circular block structure, and a fixing hole is provided in the circular direction of the rotating arm 32, and the fixing hole is fixedly connected to the limiting shaft 31. A rectangular convex block 320 is provided on the outer circumferential wall of the rotating arm 32, and a rotating surface 321 is formed on one end surface of the convex block 320. After the two rotating arms 32 are fixed to the limiting shaft 31, the convex blocks 320 on the two rotating arms 32 are staggered.

[0035] The limiting arm 33 is a strip plate structure, and a limiting block 330 perpendicular to the limiting arm 33 is provided on the limiting arm 33 . The limiting block 330 is a rectangular structure, and a side surface of the limiting block 330 opposite to the rotating surface 321 of the protrusion 320 is a limiting surface 331 .

[0036] The rotating arm 32 is fixed integrally with the reference axis of the rotation center (the limit axis 31 in the present invention), and the rotating arm 32 and the reference axis are rotationally connected, and the limit arm 33 limits the rotation of the rotating arm 32. The limit arm 33 rotates in the axial direction of the reference axis and can be positioned at a fixed point at any time. The position adjustment of the limit arm 33 is achieved by sliding displacement, which is achieved by the transformation of linear and rotational motion. The adjustment range is wide and the use is flexible. The upper swing limit position and the lower swing limit position of the reference axis are independent of each other, which is flexible to use and can be adjusted and controlled separately, and the use is very convenient.

[0037] Embodiment 1:

[0038] Combination Figure 6 Embodiment 1 is to protect the swing of the foot pedal 21 when the present invention is applied to an ankle joint rehabilitation robot.

[0039] When in use, two fixing frames 110 are arranged on the frame 11, and the driving shaft 13 and the limiting shaft 31 are correspondingly rotatably connected to the two fixing frames 110 through bearings, and the driving shaft 13 and the limiting shaft 31 are arranged horizontally and coaxially, and the two ends of the foot pedal 21 are correspondingly fixedly connected to the driving shaft 13 and the limiting shaft 31, and the driving motor 12 drives the driving shaft 13 to rotate, and correspondingly drives the foot pedal 21 and the limiting shaft 31 to rotate together. When the driving shaft 13 and the limiting shaft 31 are working, they rotate around the axis 200 in the axial direction thereof.

[0040] like Figure 7 In the present invention, the rotating arm 32 and the limiting arm 33 together form an angle limiting unit 300. When in use, the specific position of the angle limiting unit 300 is adjusted according to the upper swing limit position and the lower swing limit position during the reciprocating swing of the foot pedal 21. The angle limiting unit 300 is placed at the upper and lower swing limit positions respectively. The angle limiting unit 300 plays a safety protection role to prevent the foot pedal 21 from exceeding the limit area and causing secondary injury to the patient.

[0041] The angle limiting unit 300 is realized by mechanical mutual linkage, that is, when the upper or lower swing limit position of the foot pedal needs to be adjusted, it is only necessary to slide the slider 34 at the corresponding position, and the slider 34 drives the connecting block 36 to rotate during the sliding process, and the connecting block 36 drives the limiting arm 33 to rotate during the rotation process, and finally realizes the position change of the upper limit surface 331 of the limiting arm 33. The adjustment of the angle limiting unit 300 at the upper swing limit position and the lower swing limit position is an independent unit, which is flexible to use and can be adjusted and controlled separately, and is very convenient to use.

[0042] Embodiment 2:

[0043] like Figure 8 Embodiment 2 is a state diagram of the present invention applied to a reciprocating swinging mechanical transmission structure. When in use, a clamp seat 8 is fixed at the end of the limit shaft 31, and the power source drives the limit shaft 31 to rotate forward and reversely to realize the upward or downward swing of the clamp seat 8. The action mechanism (such as the swing arm of a rocking chair robot, etc.) is fixed on the clamp seat 8. When in use, the limit shaft 31 is also limited by the rotating arm 32 and the limit arm 33, which is flexible to adjust and has a good use effect.

[0044] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A protection mechanism for the axial reciprocating swing of a rotating shaft, characterized in that: The invention comprises a limit shaft (31), a slider (34), a slide table (35), a connecting block (36), a rotating arm (32) provided with a rotating surface (321), and a limit arm (33) provided with a limit surface (331), wherein the two rotating arms (32) are fixed on the limit shaft (31), the two limit arms (33) are respectively placed on one side of a rotating arm (32) and are rotatably connected to the limit shaft (31), the limit surface (331) is located on a rotation path of the rotating surface (321) on the rotating arm (32) rotating around the axis of the limit shaft (31), and the slide table (35) is horizontally The two sliders (34) are arranged below the limit axis (31) and between the two limit arms (33), and are arranged in parallel and fixed to the slide table (35) at different positions along the sliding direction by sliding. The two connecting blocks (36) are respectively slidably connected to one limit arm (33) and are hinged to the slider (34) on the corresponding side. The two sliders (34) at different positions are respectively driven by the corresponding connecting blocks (36) and the limit arms (33) so that the limit surfaces (331) on the limit arms (33) are at different circumferential positions when the rotating surface (321) rotates.

2. The protection mechanism for the axial reciprocating swing of the rotating shaft according to claim 1, characterized in that: The slide table (35) is provided with two rails (351) arranged in parallel with each other, and the rails (351) and the axis of the limit shaft (31) are perpendicular to each other. The two sliders (34) are correspondingly slidably connected to the two rails (351), and the sliders (34) are fixed at different positions of the rails (351) by sliding.

3. The protection mechanism for the axial reciprocating swing of the rotating shaft according to claim 2, characterized in that: A locking block (343) is inserted into the slider (34), and the locking block (343) is slidably connected to the track (351). A locking screw (344) is threadedly connected to the slider (34), and the locking screw (344) passes through the slider (34) and abuts against the locking block (343), thereby abutting the locking block (343) against the track (351).

4. The protection mechanism for the axial reciprocating swing of the rotating shaft according to claim 1, characterized in that: The rotating arm (32) is a circular block structure. A rectangular convex block (320) is provided on the outer circumferential wall of the rotating arm (32). One end surface of the convex block (320) forms a rotating surface (321).

5. The protection mechanism for the axial reciprocating swing of the rotating shaft according to claim 4, characterized in that: The limiting arm (33) is a strip plate structure, and a limiting block (330) perpendicular to the limiting arm (33) is provided on the limiting arm (33). The limiting block (330) is a rectangular structure, and a side surface of the limiting block (330) opposite to the rotating surface (321) of the protrusion (320) is a limiting surface (331).

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