Parallel double-screw reciprocating rectilinear motion mechanism
The parallel twin-screw mechanism addresses rigidity and bulkiness issues in single screw structures by employing synchronized twin screws and interlocking guide grooves, resulting in improved rigidity and compactness.
Patent Information
- Application Number
- CN202411323025.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2024-12-31
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing reciprocating linear motion mechanisms, particularly single screw structures, suffer from poor rigidity and require additional linear guide mechanisms, leading to a bulky structure.
A parallel twin-screw reciprocating linear motion mechanism with synchronized twin screws and interlocking spiral guide grooves that eliminate the need for linear guides, utilizing a pin to transfer motion between screws and a pin stabilizing device for stability.
The mechanism achieves improved rigidity and compactness by using twin screws, providing greater thrust without the need for additional linear guides, enhancing applicability to various scenarios.
Smart Images
Figure CN119222299A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a reciprocating linear motion mechanism, in particular to a parallel twin-screw reciprocating linear motion mechanism. Background Art
[0002] Reciprocating linear motion mechanisms are widely used in fields such as automated production. Common reciprocating linear motion mechanisms include reciprocating screw mechanisms, crank slider mechanisms, connecting rod mechanisms, chain (belt) drive reciprocating mechanisms, spiral disc reciprocating mechanisms, etc. Among them, reciprocating screw mechanisms are mostly single screw structures. Since the forward and reverse spiral guide grooves need to be processed on one screw at the same time, the rigidity of the screw is poor. In addition, when realizing the linear motion of the screw nut, in order to prevent the screw nut from rotating, linear guide auxiliary mechanisms such as linear guides and straight guide rods need to be configured, resulting in a bloated overall structure. Summary of the invention
[0003] Purpose of the invention: The purpose of the invention is to provide a parallel twin-screw reciprocating linear motion mechanism with good rigidity and compact structure.
[0004] Technical solution: The parallel twin-screw reciprocating linear motion mechanism of the present invention comprises a left support seat, a right support seat, a first screw, a second screw and a slider, the first screw and the second screw are rotatably arranged side by side on the two support seats, a first gear is arranged at the end of the first screw, and a second gear is arranged at the end of the second screw, and the two gears are meshed;
[0005] A first spiral guide groove is arranged on the outer cylindrical surface of the first screw, a first gradual-out guide groove is arranged on the end of the first spiral guide groove, and a first gradual-in guide groove is arranged on the starting end; the rotation direction of the first gradual-out guide groove is the same as that of the first spiral guide groove, and the rotation direction of the first gradual-in guide groove is opposite to that of the first spiral guide groove;
[0006] A second spiral guide groove is arranged on the outer cylindrical surface of the second screw rod, a second gradual-out guide groove is arranged on the end of the second spiral guide groove, and a second gradual-in guide groove is arranged on the starting end; the rotation direction of the second gradual-out guide groove is the same as that of the second spiral guide groove, and the rotation direction of the second gradual-in guide groove is opposite to that of the second spiral guide groove;
[0007] The second spiral guide groove has the same rotation direction as the first spiral guide groove;
[0008] The slider is provided with a through parallel guide hole, which is slidably matched with the outer cylindrical surface of the twin screw; a waist-shaped hole which passes through the slider up and down is provided in the middle position of the parallel guide hole, and the waist-shaped hole is perpendicular to the axial direction of the parallel guide hole; a pin is slidably arranged in the waist-shaped hole, and the pin is slidably clamped in the first spiral guide groove or the second spiral guide groove;
[0009] The external driving mechanism drives the first screw or the second screw unidirectionally; the pin is driven forward by the spiral guide groove of one screw and gradually withdraws from the gradual exit guide groove, and then gradually introduced into the corresponding spiral guide groove through the gradual entry guide groove of the other screw for reverse driving.
[0010] Furthermore, the parallel twin-screw reciprocating linear motion mechanism also includes a pin stabilizing device, which includes a slide plate, a return spring, a left push rod and a right push rod. The upper and lower end surfaces of the slide block are symmetrically provided with track grooves and a slide plate is slidably provided in the track groove. The slide plate can slide axially along the parallel guide hole; the outer side surface of the slide plate is connected to the slide block through the return spring, and the inner side surface of the slide plate is provided with a stopper; the left push rod is installed on the inner side of the left support seat, one on the upper and one on the lower side; the right push rod is installed on the inner side of the right support seat, one on the upper and one on the lower side;
[0011] When the slide plate is in the initial position, the block blocks the pin to prevent it from moving to the other side of the waist-shaped hole, and prevents the pin from falling out of the spiral guide groove during the movement of the slider; when the pin is driven by the gradual exit guide groove of a screw rod, the push rod pushes the slide plate to move so that the block gradually gives up the position of the waist-shaped hole, and then the pin can be driven by the gradual entry guide groove of another screw rod to move to the other side of the waist-shaped hole, completing the reversal of the slider; the reset spring is used to reset the slide plate after the slider reverses, and the block blocks the pin again.
[0012] Furthermore, the track groove is composed of a block groove provided on the slide block, a slide plate guide groove, and guide plates installed on the slide block and located on both sides of the slide plate guide groove.
[0013] Furthermore, the initial position is a middle position of the slider.
[0014] Furthermore, the stopper is located at the center of the inner side surface of the slide plate.
[0015] Furthermore, eyelet screws are fixed on the outer side of the slide plate, eyelet screws are fixed on both sides of the track groove on the slider, and the return spring connects the slide plate and the slider via the eyelet screws.
[0016] Furthermore, the parallel guide holes are opened at the center of the slider.
[0017] Furthermore, the depth of the gradual-out guide groove decreases from deep to shallow until it disappears completely.
[0018] Furthermore, the depth of the gradual guide groove increases from shallow to deep until it is connected with the starting end of the corresponding spiral guide groove.
[0019] Furthermore, the external driving mechanism adopts a motor.
[0020] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the present invention drives the slider to move back and forth linearly through a twin screw, which has better rigidity than a single screw structure and can provide greater thrust. In addition, the use of a twin screw to guide the slider does not require the configuration of a linear guide auxiliary mechanism such as a linear guide rail or a straight guide rod, and the structure is more compact. Therefore, the present invention can meet the needs of more usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of a parallel twin-screw reciprocating linear motion mechanism provided by an embodiment of the present invention;
[0022] Figure 2 It is a partial enlarged view of the twin-screw in the embodiment of the present invention;
[0023] Figure 3 Schematic diagram of the structure of the slider in the embodiment of the present invention. DETAILED DESCRIPTION
[0024] The present invention will be further described below in conjunction with the accompanying drawings.
[0025] Attached Figures 1 to 3 The reference numerals in the figures are as follows:
[0026] 11, left support seat; 12, right support seat; 2, first screw rod; 21, first spiral guide groove; 22, first gradual-out guide groove; 23, first gradual-in guide groove; 3, second screw rod; 31, second spiral guide groove; 32, second gradual-out guide groove; 33, second gradual-in guide groove; 41, first gear; 42, second gear; 5, slider; 51, parallel guide holes; 52, waist-shaped hole; 53, block groove; 54, slide plate guide groove; 55, guide plate; 6, pin shaft; 7, slide plate; 71, block; 8, return spring; 81 / 82, sheep eye screw; 91, left push rod; 92, right push rod.
[0027] like Figures 1 to 3 As shown, an embodiment of the present invention provides a parallel twin-screw reciprocating linear motion mechanism, including a left support seat 11, a right support seat 12, a first screw 2, a second screw 3, a gear set, a slider 5, a pin 6 and a pin stabilizing device.
[0028] The first screw rod 2 and the second screw rod 3 are rotatably arranged side by side on two support seats. The gear set includes a first gear 41 and a second gear 42, the first gear 41 is arranged at the right end of the first screw rod 2, and the second gear 42 is arranged at the right end of the second screw rod 3, and the two gears are meshed.
[0029] The external drive mechanism drives the first screw 2 or the second screw 3 in one direction, and under the action of the gear set, the two screws rotate synchronously in opposite directions. In this embodiment, the external drive mechanism adopts a motor. Figure 1Viewed from right to left, the first screw rod 2 rotates counterclockwise, and the second screw rod 3 rotates clockwise.
[0030] A first spiral guide groove 21 is provided on the outer cylindrical surface of the first screw rod 2, a first gradual-out guide groove 22 is provided at the end of the first spiral guide groove 21, and a first gradual-in guide groove 23 is provided at the starting end. The rotation direction of the first gradual-out guide groove 22 is the same as that of the first spiral guide groove 21, and the rotation direction of the first gradual-in guide groove 23 is opposite to that of the first spiral guide groove 21.
[0031] A second spiral guide groove 31 is provided on the outer cylindrical surface of the second screw rod 3, a second gradual-out guide groove 32 is provided at the end of the second spiral guide groove 31, and a second gradual-in guide groove 33 is provided at the starting end. The rotation direction of the second gradual-out guide groove 32 is the same as that of the second spiral guide groove 31, and the rotation direction of the second gradual-in guide groove 33 is opposite to that of the second spiral guide groove 31.
[0032] The depth of the gradually exiting guide groove changes from deep to shallow until it completely disappears. The depth of the gradually entering guide groove changes from shallow to deep until it is connected to the starting end of the corresponding spiral guide groove. The direction of rotation of the second spiral guide groove 31 is the same as that of the first spiral guide groove 21, and in this embodiment, they are both right-hand spiral grooves.
[0033] The center of the slider 5 is provided with a through parallel guide hole 51, which is slidably matched with the outer cylindrical surface of the twin screw. A waist-shaped hole 52 is provided in the middle of the parallel guide hole 51, which passes through the slider 5 from top to bottom, and the waist-shaped hole 52 is perpendicular to the axial direction of the parallel guide hole 51. The pin 6 is slidably arranged in the waist-shaped hole 52, and the pin 6 is slidably clamped in the first spiral guide groove 21 or the second spiral guide groove 31.
[0034] The gradually-out guide groove of one screw corresponds to the gradually-in guide groove of the other screw, and they appear in pairs. The two incomplete guide grooves are matched together to form a complete combined guide groove, and the pin 6 can slide in the combined guide groove. The pin 6 is positively driven by the spiral guide groove of one screw and gradually withdraws from the gradually-out guide groove, and then gradually introduced into the corresponding spiral guide groove through the gradually-in guide groove of the other screw for reverse drive.
[0035] In this embodiment, the first gradual-out guide groove 22 is located at the left end of the first screw 2, and the second gradual-in guide groove 33 is located at the left end of the second screw 3. The first gradual-out guide groove 22 and the second gradual-in guide groove 33 are two incomplete guide grooves that are matched together to form a complete combined guide groove. The first screw 2 rotates counterclockwise, and the first spiral guide groove 21 drives the pin 6 and the slider 5 to move to the left. After the slider 5 reaches the leftmost end, the pin 6 gradually exits the first spiral guide groove 21 through the first gradual-out guide groove 22, and gradually enters the starting end of the second spiral guide groove 31 through the second gradual-in guide groove 33. The second screw 3 rotates clockwise, and the second spiral guide groove 31 drives the pin 6 and the slider 5 to move to the right to achieve the reversal of the slider 5. After the slider 5 reaches the rightmost end, the reversal method at the right end is the same as that at the left end, which will not be described in detail here.
[0036] The pin stabilizing device is used to prevent the pin shaft 6 from falling out of the spiral guide groove during the movement of the slider 5, and includes a slide plate 7, a return spring 8, a left push rod 91 and a right push rod 92.
[0037] The upper and lower end surfaces of the slider 5 are symmetrically provided with track grooves, which are composed of a block groove 53 provided on the slider 5, a slide guide groove 54, and guide plates 55 installed on the slider 5 and located on both sides of the slide guide groove 54. A slide plate 7 is slidably arranged in the track groove, and the slide plate 7 can slide axially along the parallel guide holes 51.
[0038] Eyelet screws 81 are fixed on the outer side of the slide plate 7, eyelet screws 82 are fixed on the slider 5 at the middle positions on both sides of the track groove, one end of the two return springs 8 is connected to the eyelet screws 81 on the outer side of the slide plate 7, and the other ends of the two return springs 8 are fixed to the slider 5 through the eyelet screws 82. A stopper 71 is provided at the center of the inner side of the slide plate 7. When the slide plate 7 is in the initial position, that is, the middle position of the slider 5, the stopper 71 just blocks the pin 6 to prevent the pin 6 from moving to the other side of the waist-shaped hole 52.
[0039] The left push rod 91 is installed in the inner side of the left support seat 11, one each up and down, toward the right side. The right push rod 92 is installed in the inner side of the right support seat 12, one each up and down, toward the left side.
[0040] The slider 5 continues to move to the left, and when the pin 6 is driven by the first gradual exit guide groove 22, the two left push rods 91 push the upper and lower slide plates 7 to move to the right, so that the block 71 gradually gives up the position of the waist-shaped hole 52, and then the pin 6 can move to the other side of the waist-shaped hole 52 under the drive of the second gradual entry guide groove 33, completing the reversal of the slider 5. After the slider 5 completes the reversal, the stretched return spring 8 resets the slider 7, and the block 71 blocks the pin 6 again. The other side is the same, which will not be repeated here.
Claims
1. A parallel twin-screw reciprocating linear motion mechanism, characterized in that: The invention comprises a left support seat (11), a right support seat (12), a first screw rod (2), a second screw rod (3) and a sliding block (5); the first screw rod (2) and the second screw rod (3) are rotatably arranged side by side on the two support seats; a first gear (41) is arranged at the end of the first screw rod (2), and a second gear (42) is arranged at the end of the second screw rod (3); the two gears are meshed with each other; A first spiral guide groove (21) is arranged on the outer cylindrical surface of the first screw rod (2); a first gradual exit guide groove (22) is arranged at the end of the first spiral guide groove (21), and a first gradual entry guide groove (23) is arranged at the starting end; the rotation direction of the first gradual exit guide groove (22) is the same as that of the first spiral guide groove (21), and the rotation direction of the first gradual entry guide groove (23) is opposite to that of the first spiral guide groove (21); A second spiral guide groove (31) is provided on the outer cylindrical surface of the second screw rod (3); a second gradual exit guide groove (32) is provided at the end of the second spiral guide groove (31), and a second gradual entry guide groove (33) is provided at the starting end; the rotation direction of the second gradual exit guide groove (32) is the same as that of the second spiral guide groove (31), and the rotation direction of the second gradual entry guide groove (33) is opposite to that of the second spiral guide groove (31); The second spiral guide groove (31) has the same rotation direction as the first spiral guide groove (21); The slider (5) is provided with a through parallel guide hole (51), and the parallel guide hole (51) is slidably matched with the outer cylindrical surface of the twin screw; a waist-shaped hole (52) is provided in the middle position of the parallel guide hole (51) and passes through the slider (5) from top to bottom, and the waist-shaped hole (52) is perpendicular to the axial direction of the parallel guide hole (51); a pin shaft (6) is slidably arranged in the waist-shaped hole (52), and the pin shaft (6) is slidably clamped in the first spiral guide groove (21) or the second spiral guide groove (31); The external driving mechanism drives the first screw (2) or the second screw (3) unidirectionally; the pin (6) is driven in the forward direction by the spiral guide groove of one screw and gradually withdraws from the gradual exit guide groove, and then gradually guided into the corresponding spiral guide groove through the gradual entry guide groove of the other screw for reverse driving.
2. The parallel twin-screw reciprocating linear motion mechanism according to claim 1, characterized in that: The device also includes a pin stabilizing device, which includes a slide plate (7), a return spring (8), a left push rod (91) and a right push rod (92). The upper and lower end surfaces of the slide block (5) are symmetrically provided with track grooves and the slide plate (7) is slidably provided in the track grooves. The slide plate (7) can slide axially along the parallel guide holes (51). The outer side surface of the slide plate (7) is connected to the slide block (5) through the return spring (8). The inner side surface of the slide plate (7) is provided with a stopper (71). The left push rod (91) is installed on the inner side of the left support seat (11), one on the upper and one on the lower side. The right push rod (92) is installed on the inner side of the right support seat (12), one on the upper and one on the lower side. When the slide plate (7) is in the initial position, the stopper (71) blocks the pin shaft (6) to prevent it from moving to the other side of the waist-shaped hole (52), thereby preventing the pin shaft (6) from escaping from the spiral guide groove during the movement of the slider (5); when the pin shaft (6) is driven by the gradual exit guide groove of a screw rod, the push rod pushes the slide plate (7) to move so that the stopper (71) gradually gives up the position of the waist-shaped hole (52), and then the pin shaft (6) can be driven by the gradual entry guide groove of another screw rod to move to the other side of the waist-shaped hole (52), thereby completing the reversal of the slider (5); the reset spring (8) is used to reset the slide plate (7) after the slider (5) is reversed, and the stopper (71) blocks the pin shaft (6) again.
3. The parallel twin-screw reciprocating linear motion mechanism according to claim 2, characterized in that: The track groove is composed of a block groove (53) formed on the slide block (5), a slide guide groove (54), and guide plates (55) mounted on the slide block (5) and located on both sides of the slide guide groove (54).
4. The parallel twin-screw reciprocating linear motion mechanism according to claim 2, characterized in that: The initial position is the middle position of the slider (5).
5. The parallel twin-screw reciprocating linear motion mechanism according to claim 2, characterized in that: The stopper (71) is located at the center of the inner side surface of the slide plate (7).
6. The parallel twin-screw reciprocating linear motion mechanism according to claim 2, characterized in that: The outer side surface of the slide plate (7) is fixed with eyelet screws, and the sliding block (5) is fixed with eyelet screws on both sides of the track groove. The return spring (8) connects the slide plate (7) and the sliding block (5) via the eyelet screws.
7. The parallel twin-screw reciprocating linear motion mechanism according to claim 1, characterized in that: The parallel guide holes (51) are opened at the center of the slider (5).
8. The parallel twin-screw reciprocating linear motion mechanism according to claim 1, characterized in that: The depth of the gradual exit guide groove gradually decreases from deep to shallow until it disappears completely.
9. The parallel twin-screw reciprocating linear motion mechanism according to claim 1, characterized in that: The depth of the gradual guide groove increases from shallow to deep until it is connected with the starting end of the corresponding spiral guide groove.
10. The parallel twin-screw reciprocating linear motion mechanism according to claim 1, characterized in that: The external driving mechanism adopts a motor.