CN210686891U

CN210686891U - Lead screw supporting device in long-span lead screw transmission

Info

Publication number: CN210686891U
Application number: CN201921456857.9U
Authority: CN
Inventors: 徐维亚
Original assignee: Quanzhou Yaguan Automation Machinery Manufacturing Co ltd
Current assignee: Quanzhou Yaguan Automation Machinery Manufacturing Co ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-06-05
Anticipated expiration: 2029-09-04

Abstract

The utility model relates to the field of mechanical equipment, especially indicate a lead screw strutting arrangement in long-span lead screw transmission, including the lift seat with connect two rollers on the lift seat. The two rollers are respectively and rotatably connected to the two sides of the lifting seat, and the length directions of the axes of the two rollers are consistent with that of the axis of the lead screw. The lifting seat moves up and down relative to the screw rod, and after the lifting seat moves upwards, the screw rod is supported by a gap between the two rollers. In the operation process of the screw rod transmission mechanism, when the screw rod drives the nut support to move to a position close to the lifting seat, the lifting seat descends, the roller descends to have a gap with the screw rod, and the gap can prevent the roller supporting the screw rod from blocking the nut support when the nut support moves. After the nut support passes through the upper part of the lifting seat, the lifting seat rises to continuously support and support the middle of the screw rod, so that the two ends and the middle of the screw rod are in the same straight line, and the transmission efficiency and the transmission precision of the screw rod transmission mechanism are ensured.

Description

Lead screw supporting device in long-span lead screw transmission

Technical Field

The utility model relates to the field of mechanical equipment, especially indicate a lead screw strutting arrangement in long-span lead screw transmission.

Background

The screw transmission has the characteristics of small friction resistance, high transmission efficiency, sensitive movement, no idle stroke dead zone in reverse direction and the like, and is widely applied to mechanical equipment and the like. Common screw drive mechanism is the device that turns into rectilinear motion with rotary motion, and is concrete, and the both ends of lead screw are supported by bearing and bearing frame, and the screw thread part adaptation of lead screw has the nut support, rotates through motor drive lead screw, realizes that the nut support is along lead screw length direction displacement. In the practical design process, the lead screw is usually applied to a long-span overlong lead screw, namely the length-diameter ratio is larger than 60, at the moment, the lead screw is larger in span, and the middle part of the lead screw can bend and droop under the action of gravity, so that the critical rotating speed of the lead screw is influenced, or chattering is caused, and the transmission precision is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lead screw strutting arrangement in long-span lead screw transmission to overcome the crooked flagging problem in middle part of long-span lead screw.

The utility model adopts the following technical scheme: the utility model provides a lead screw strutting arrangement in long-span lead screw transmission which characterized in that: the automatic feeding device comprises a lifting seat and two rollers connected to the lifting seat, wherein the two rollers are respectively and rotatably connected to two sides of the lifting seat, and the axial length directions of the two rollers are consistent with the axial length direction of a lead screw; the lifting seat moves up and down relative to the screw rod, and after the lifting seat moves upwards, the screw rod is supported by a gap between the two rollers.

As a further improvement, the lifting mechanism further comprises a lifting cylinder, the lifting cylinder is fixedly connected to the rack of the lead screw transmission mechanism and located below the middle position of the lead screw, and the tail end of a piston rod of the lifting cylinder is connected to the lifting seat.

As a further improvement, the lifting device further comprises an upright post, wherein the upright post is fixedly connected to a rack of a lead screw transmission mechanism, and the lifting cylinder is fixed on the side surface of the upright post; the side of the upright post is provided with a limiting hole which is in a strip shape and is vertically arranged, the bottom of the lifting seat is connected with a limiting rod, and one end of the limiting rod is embedded into the limiting hole.

As a further improvement, the lifting cylinder is a stroke-adjustable cylinder.

As a further improvement, the device also comprises a control mechanism, wherein the control mechanism comprises a support rod, a floating rod, a travel switch and a control unit, the support rod is fixed on the rack, the support rod is parallel to the screw rod, the floating rod is connected above the support rod in a lifting manner, and the nut support can move to press down the floating rod; the two ends of the supporting rod are fixedly connected with the travel switches, and the two ends of the floating rod cover the upper parts of the travel switches; the control unit receives a signal after the travel switch is triggered to control the piston rod of the lifting cylinder to descend, and the control unit receives a signal after the travel switch is not triggered to control the piston rod of the lifting cylinder to ascend.

As a further improvement, two ends of the bottom of the floating rod are fixedly connected with springs, and the two springs are correspondingly connected to two ends above the supporting rod.

As a further improvement, the nut support is connected with a roller, and the bottom surface of the roller is lower than the height of the floating rod after the floating rod rises.

As a further improvement, both sides of the support rod are connected with shaft sleeves, the side surfaces of the shaft sleeves are fixed with rotating shafts, and the rotating shafts are embedded into the side surfaces of the support rod and rotate relative to the support rod; the center of the shaft sleeve is provided with a through hole, two ends of the floating rod are fixed with bolts, and the two bolts are respectively embedded into the through holes of the shaft sleeves at two sides of the supporting rod.

From the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: when the screw rod drives the nut support to move to a position close to the lifting seat, the lifting seat descends to enable the roller to descend to have a gap with the screw rod, and the gap can prevent the roller from blocking the nut support when the nut support moves; after the nut support passes through the upper part of the lifting seat, the lifting seat rises to continuously support the middle of the screw rod, so that the two ends and the middle of the screw rod are positioned on the same straight line, the middle part of the screw rod is prevented from bending and sagging under the action of gravity, and the transmission efficiency and precision of the screw rod transmission mechanism are ensured.

Drawings

Fig. 1 is a schematic perspective view of the present invention installed on a frame with a ball screw mechanism.

Fig. 2 is an enlarged view of direction a in fig. 1.

FIG. 3 is a schematic view of the front structure of the roller raised to support the lead screw.

Fig. 4 is a schematic front view of the structure of the roller lowered to a position where a gap is formed between the bearing and the screw.

Fig. 5 is a schematic side view of the connecting screw driving mechanism of the present invention.

Fig. 6 is a schematic perspective view of one side of the present invention.

Fig. 7 is a schematic perspective view of the other side of fig. 5 in accordance with the present invention.

FIG. 8 is a top view of the pedestal connecting the elevator base and the drum.

Fig. 9 is a schematic front view of the end face of the support bar and float bar connection.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 to 6, a screw supporting device in a long-span screw transmission comprises a column 2, a lifting seat 3, a lifting cylinder 5, a roller 4 and a control mechanism. The upright post 2 is positioned below the screw rod 11 and at the middle position of the screw rod 11 in the length direction, and the upright post 2 is fixedly connected to a frame 13 for assembling a ball screw structure. The upright post 2 can be further fixedly connected with a fixing plate 21, the lifting cylinder 5 is vertically fixed on the fixing plate 21, and the lifting cylinder 5 is right below the screw rod 11. The number of the rollers 4 is two, the two rollers 4 can be nylon rollers embedded with bearings, the two rollers 4 are respectively and rotatably connected to two sides of the lifting seat 3, and the length directions of the axes of the two rollers 4 are consistent with the length direction of the axis of the lead screw 11. The lifting seat 4 is fixedly connected to the tail end of a piston rod 51 of the lifting cylinder 5, and the lifting seat 4 is driven to ascend or descend relative to the upright post 2 through the extension or retraction of the piston rod 51 of the lifting cylinder 5, so that the roller 4 ascends or descends relative to the screw rod 11. As shown in fig. 2 and 3, when the lifting seat 3 is lifted, the gap between the two rollers 4 supports the lead screw 11 and jacks up the lead screw 11, so that the lead screw 11 is kept parallel as a whole, and simultaneously the lead screw 11 is tangent to the two rollers 4. When the screw rod 11 rotates, the two rollers 4 and the screw rod 11 rotate simultaneously, and the structure of the two rollers 4 can support the screw rod 11 and simultaneously avoid resistance to the rotation of the screw rod 11.

As shown in fig. 3, 4, 6 and 7, the lifting cylinder 5 is a stroke-adjustable cylinder in the prior art, and can adjust the height of the piston rod 51 of the lifting cylinder 5 after extending out, that is, the distance between the two rollers 4 and the lead screw 11 after the piston rod 51 drives the lifting seat 3 to rise, and by this action, the height of the lead screw 11 supported by the two rollers 4 can be adjusted, so that the two ends and the middle of the lead screw 11 are on the same straight line.

As shown in fig. 1, 2 and 5, the control mechanism comprises a support rod 7, a floating rod 8, a travel switch and a control unit. The support rod 7 is fixed on the bracket 13, and the support rod 7 is parallel to the screw rod 11. The both ends of the bottom of the floating rod 8 are fixedly connected with the springs 72, and the lower ends of the two springs 72 are correspondingly and fixedly connected to the two ends of the supporting rod 7, specifically, through holes can be formed in the upper surface of the supporting rod 7, so that the springs 72 directly penetrate into the supporting rod 7 through the through holes, and the structure of supporting the floating rod 8 through the springs 72 enables the floating rod 8 to keep a relatively fixed distance from the supporting rod 7. The two ends of the supporting rod 7 are fixedly connected with the travel switches, and the two ends of the floating rod 8 cover the upper portions of the travel switches. The control unit can be a PLC (programmable logic controller), the two travel switches are separately and electrically connected to the control unit, signals are sent to the control unit after the two travel switches are triggered, and the control unit receives the triggered signals of the travel switches to control the piston rod 51 of the lifting cylinder 5 to descend; and the signal after the trigger of the travel switch is lost is also sent to the control unit, and the control unit receives the signal after the trigger of the travel switch is lost and controls the piston rod 51 of the lifting cylinder 5 to ascend. The nut support 12 is fixedly connected with a roller 14 in front, the specific connection mode may be that a connecting plate 15 is fixedly connected in front of the nut support, a pin 16 is welded and fixed at the lower end of the connecting plate 15, the roller 14 is fixedly connected to one end of the pin 16, and the roller 14 may be a bearing. Meanwhile, the bottom surface of the roller 14 after being assembled and fixed is lower than the height of the floating rod 8 after rising, so that the nut support 12 can be moved to the position of the floating rod 8, the floating rod 8 can be pressed down through the roller 14, and the travel switch 6 is pressed down through the falling of the floating rod 8, so that the travel switch 6 is triggered. Furthermore, the two ends of the floating rod 8 in the moving direction of the nut support 12 are respectively provided with a downward inclined surface, so that the roller 14 can be guided by one of the inclined surfaces to slowly move onto the floating rod 8 and guided by the other inclined surface to slowly move out of the floating rod 8, thereby improving the smoothness of the movement of the nut support 12.

Specifically, as shown in fig. 2 and 5, when the screw 11 drives the nut support 12 to move from right to left, and when the nut support 12 is close to the position of the lifting cylinder 5 (i.e., the position of the lifting seat 3), one end of the floating rod 8 is pressed down by the roller 14, so as to trigger the travel switch 61, at this time, the travel switch 61 receives a signal and transmits the signal to the control unit, the control unit controls the lifting gas 5 to drive the lifting seat 3 to descend, so that the roller 4 descends to have a gap with the screw 11, and the gap is used to prevent the roller 4 from blocking the nut support 12 when the nut support 3 and the connecting plate 15 move; when the nut support 3 moves to the position above the lifting seat 4 (namely the middle position of the floating rod 8), the two ends of the floating rod 8 are uniformly stressed and integrally descend, so that the travel switches 62 are triggered at the same time; after the nut support 12 passes over the lifting seat 3, the roller 14 keeps pressing down the floating rod 8 at one end of the travel switch 62, so that the travel switch 62 is still in a triggered state, and the lifting cylinder 5 receives the signal to enable the lifting seat 3 to still be in a descending state; after the nut support 12 moves to enable the roller 14 to leave the floating rod 8, the floating rod 8 resets under the acting force of the spring 72, at the moment, the travel switch 62 loses the pressing of the floating rod 8 and resets along with the pressing, namely loses being triggered, the travel switch 62 sends a signal to the control unit, and the control unit controls the lifting cylinder 5 to drive the lifting seat 3 to ascend to continuously lift the screw rod 11, so that the screw rod 11 is continuously kept in a balanced state.

As shown in fig. 2, 5 and 9, the two ends of the support rod 7 are connected with a shaft sleeve 71, and a rotating shaft 73 is fixed on the side surface of the shaft sleeve 71, and the rotating shaft 73 is embedded into the side surface of the support rod 7 and rotates relative to the support rod 7. Specifically, the bracing piece 7 side is equipped with the through-hole, pivot 73 end is equipped with the external screw thread, and external screw thread adapter coupling has nut 74, and bracing piece 7 is equipped with the groove of stepping down of putting into nut 74 in the bottom surface that corresponds the through-hole, during the assembly with pivot 73 embedding through-hole, put into bracing piece 7 with the nut 74 again in with pivot 73 screwed connection to fastening, can realize the rotation of the relative bracing piece 7 of pivot 73, realize the rotation of the relative bracing piece 7 of axle sleeve 71 promptly. The center of the shaft sleeve 71 is provided with a through hole, the two ends of the floating rod 8 are both fixed with bolts 81, the two bolts 81 are respectively embedded into the through holes of the shaft sleeve 71 at the two ends of the support rod 7, further, the bolts can be fixed with the connecting nut 72 after being embedded into the shaft sleeve, and the bolts 81 are placed to run out of the shaft sleeve 71. The structure that the plug pin 81 is embedded in the shaft sleeve 71 can play a role of limiting the floating rod 8, and prevent the floating rod 8 from being ejected by the roller 14 when the nut support 12 drives the roller 14 to move to the position of the floating rod 8, namely prevent the floating rod 8 from running relative to the support rod 7; and because the shaft sleeve 71 can rotate relative to the support rod 7, the structure can simultaneously ensure that the two ends of the floating rod 8 can swing up and down without limitation.

In addition, as shown in fig. 6 to 8, the side surface of the upright post 2 is provided with a bar-shaped and vertically-arranged limiting hole 22, the bottom of the lifting seat 3 is connected with a limiting rod 31, one end of the limiting rod 31 is welded and fixed at the bottom of the lifting seat 3, and the other end of the limiting rod 31 is embedded into the limiting hole 22. When the lifting seat 3 ascends or descends, the structure that the limiting rod 31 is embedded into the limiting hole 22 can enable the lifting seat 3 to always keep a vertical lifting or descending state, prevent the lifting seat 3 from inclining to two ends of the length direction of the lead screw 11, and prevent the piston rod 51 of the lifting cylinder 5 from rotating. Preferably, after the limiting rod 31 passes through the limiting hole 22, a nut 32 is further screwed in the upright post 2, and the lifting seat 3 can be prevented from inclining outwards towards the side edge of the upright post 2 by the limitation of the nut 32.

The above-mentioned be the utility model discloses a concrete implementation way, nevertheless the utility model discloses a design concept is not limited to this, and the ordinary use of this design is right the utility model discloses carry out immaterial change, all should belong to the act of infringement the protection scope of the utility model.

Claims

1. The utility model provides a lead screw strutting arrangement in long-span lead screw transmission which characterized in that: the automatic feeding device comprises a lifting seat and two rollers connected to the lifting seat, wherein the two rollers are respectively and rotatably connected to two sides of the lifting seat, and the axial length directions of the two rollers are consistent with the axial length direction of a lead screw; the lifting seat moves up and down relative to the screw rod, and after the lifting seat moves upwards, the screw rod is supported by a gap between the two rollers.

2. The screw support device in a long-span screw drive according to claim 1, wherein: the lifting cylinder is fixedly connected to the rack of the lead screw transmission mechanism and located below the middle position of the lead screw, and the tail end of a piston rod of the lifting cylinder is connected to the lifting seat.

3. The screw support device in a long-span screw drive according to claim 2, wherein: the lifting cylinder is fixed on the side surface of the upright column; the side of the upright post is provided with a limiting hole which is in a strip shape and is vertically arranged, the bottom of the lifting seat is connected with a limiting rod, and one end of the limiting rod is embedded into the limiting hole.

4. The screw support device in a long-span screw drive according to claim 2, wherein: the lifting cylinder is a stroke-adjustable cylinder.

5. The screw support device in a long-span screw drive according to claim 2, wherein: the control mechanism comprises a support rod, a floating rod, a travel switch and a control unit, wherein the support rod is fixed on the rack, the support rod is parallel to the lead screw, the floating rod is connected above the support rod in a lifting manner, and the nut support can move to press the floating rod downwards; the two ends of the supporting rod are fixedly connected with the travel switches, and the two ends of the floating rod cover the upper parts of the travel switches; the control unit receives a signal after the travel switch is triggered to control the piston rod of the lifting cylinder to descend, and the control unit receives a signal after the travel switch is not triggered to control the piston rod of the lifting cylinder to ascend.

6. The screw support device in a long-span screw drive according to claim 5, wherein: the two ends of the bottom of the floating rod are fixedly connected with springs, and the two springs are correspondingly connected to the two ends above the supporting rod.

7. The screw support device in a long-span screw drive according to claim 5, wherein: the nut support is connected with a roller, and the bottom surface of the roller is lower than the height of the floating rod after the floating rod rises.

8. The screw support device in a long-span screw drive according to claim 5, wherein: the two sides of the supporting rod are both connected with shaft sleeves, the side surfaces of the shaft sleeves are fixedly provided with rotating shafts, and the rotating shafts are embedded into the side surfaces of the supporting rod and rotate relative to the supporting rod; the center of the shaft sleeve is provided with a through hole, two ends of the floating rod are fixed with bolts, and the two bolts are respectively embedded into the through holes of the shaft sleeves at two sides of the supporting rod.