Pushing type clamping device with one-way stroke lock

Abstract

The invention discloses a pushing type clamping device with a one-way stroke lock. The pushing type clamping device comprises an assembling base, a pushing head, a rotating shaft, a ratchet wheel, a pawl and a posture switching mechanism. The pushing head can stretch forwards towards the assembling base so as to clamp a workpiece on the assembling base. The rotating shaft is in transmission connection with the pushing head through a transmission assembly, drives the pushing head to extend forwards when rotating forwards, and drives the pushing head to retract when rotating backwards; when the rotating shaft rotates, the ratchet wheel is driven to rotate synchronously; the pawl is movably arranged, and the pawl can move to be in an inserting posture and a separating posture; the posture switching mechanism can drive the pawl to move, so that the pawl is switched to be in an inserting posture or a separating posture; the posture switching mechanism is associated with the pushing head; and when the pushing head extends forwards to a limit position, the posture switching mechanism switches the pawl from the insertion posture to the separation posture so as to relieve the obstruction to the reverse rotation of the rotating shaft. According to the invention, the pushing mechanism can be ensured to push in place in the workpiece assembling process.

Description

Technical Field

[0001] The invention relates to the technical field of workpiece clamping and assembling, in particular to a push-up type clamping and assembling device with a one-way travel lock. Background Art

[0002] In industrial production, many workpieces need to be assembled through a push-out mechanism, such as pushing parts into the assembly holes of workpieces. However, for manually controlled push-out mechanisms, it is difficult to judge whether workers have pushed the parts into place through the push-out mechanism, and the depth of the parts entering the assembly holes may not meet the standards, affecting the quality of the assembled workpieces. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a push-up type clamping device with a one-way travel lock, which can ensure that the push-up mechanism is pushed into place during the workpiece assembly process.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides a push-type clamping device with a one-way travel lock, comprising an assembly seat, a push-type head, a rotating shaft, a ratchet, a pawl and a posture switching mechanism; the push-type head is retractable and can extend toward the assembly seat to clamp the workpiece on the assembly seat; the rotating shaft is connected to the push-type head through a transmission assembly, and the push-type head is driven to extend when the rotating shaft rotates forward, and is driven to retract when the rotating shaft rotates reversely; the ratchet is installed on the rotating shaft, and the ratchet is driven to rotate synchronously when the rotating shaft rotates; the pawl is retractable The pawl is movable and can be moved to a plug-in posture and a disengagement posture; in the plug-in posture, the pawl is correspondingly inserted into the gear teeth of the ratchet wheel and hinders the reversal of the rotating shaft; in the disengagement posture, the pawl is separated from the ratchet wheel, and the obstruction of the pawl to the reversal of the rotating shaft is released; the posture switching mechanism can drive the pawl to move, so that the pawl switches to a plug-in posture or a disengagement posture; the posture switching mechanism is associated with the push head; when the push head extends forward to the limit position, the posture switching mechanism switches the pawl from the plug-in posture to the disengagement posture to relieve the obstruction to the reversal of the rotating shaft.

[0005] Furthermore, the pawl is a swinging member; the pawl can swing to be inserted into the gear teeth of the ratchet wheel, or swing to be separated from the ratchet wheel.

[0006] Furthermore, the posture switching mechanism includes a limit plate, which is installed on the rotating shaft so that the limit plate is connected to the push head through the rotating shaft; a limit slot is provided on the limit plate, and the groove edge contour of the limit slot is the limit contour; a slider is connected to the pawl, the slider is located in the limit slot, and can slide along the limit contour; when the limit plate rotates with the rotating shaft, the limit plate changes the position of the slider through the limit contour to drive the pawl to swing to a plug-in posture or a separation posture.

[0007] Furthermore, the limiting contour is annular and consists of a proximal side, a forward switching bevel, a distal side and a reverse switching bevel connected in sequence from head to tail; the proximal side is close to the rotating shaft, and the distal side is far from the rotating shaft; when the slider slides along the proximal side, the pawl approaches the ratchet and the pawl is inserted into the teeth of the ratchet; when the slider slides along the distal side, the pawl is separated from the ratchet; the forward switching bevel gradually tilts from the proximal side to the distal side in the reverse direction of the rotating shaft; during the forward rotation of the rotating shaft, the slider on the proximal side can slide along the forward switching bevel to the distal side; the reverse switching bevel gradually tilts from the distal side to the proximal side in the forward direction of the rotating shaft; during the reversal of the rotating shaft, the slider on the distal side can slide along the reverse switching bevel to the proximal side.

[0008] Furthermore, the proximal axis edge and the distal axis edge are both arc edges concentric with the rotation axis.

[0009] Furthermore, an elastic member is connected to the pawl, which drives the elastic member to expand and contract when the pawl swings; during the sliding of the slider along the forward switching bevel or the reverse switching bevel, the elastic potential energy of the elastic member first increases and then decreases, so that the elastic potential energy of the elastic member needs to be overcome first during the process of switching the pawl posture.

[0010] Furthermore, the pawl is installed on the base through a swing shaft, and the elastic member is a tension spring, one end of the tension spring is connected to the slider, and the other end of the tension spring is connected to the fixed pin of the base; the slider and the fixed pin are respectively located on both sides of the swing shaft, and the straight line connecting the fixed pin and the swing shaft is the swing center line; in the process of the slider sliding along the forward switching bevel or the reverse switching bevel, the slider swings across the swing center line with the pawl, so that the distance between the slider and the fixed pin first increases and then decreases, and the tension spring first stretches and then retracts.

[0011] Furthermore, the posture switching mechanism also includes a crank, one end of which is connected to the rotating shaft, and the rotating shaft is driven to rotate when the crank is swung.

[0012] Furthermore, the crank handle is a heavy object; during the reversal of the rotating shaft, the crank handle swings down after passing the highest point; when the crank handle swings down, it can drive the slider to swing across the swing center line under the action of gravity, switching the pawl from a separated posture to a plug-in posture.

[0013] Furthermore, the rotating shaft is rotatably mounted on the support; a guide hole is also provided on the support, a sliding rod is provided in the guide hole, and the pushing head is installed at the front end of the sliding rod; the transmission assembly includes a plurality of connecting rods, and the rotating shaft is connected to the rear end of the sliding rod through the plurality of connecting rods; when the rotating shaft rotates, the sliding rod is driven to slide in the guide hole through the plurality of connecting rods, thereby driving the pushing head to extend and retract.

[0014] Beneficial effects: The push-up type clamping device with a one-way travel lock of the present invention has the following beneficial effects:

[0015] 1) The clamping device of the present invention can retract the ejector head only after the ejector head has been extended to the maximum stroke. Therefore, when assembling the part to the workpiece, it can be determined whether the ejector head has been extended to the limit position by whether the rotating shaft can be reversed, and further whether the part has been installed in place.

[0016] 2) The maximum stroke of the push head during its extension is limited by the cooperation of the pawl and the ratchet; the separation and combination of the pawl and the ratchet are controlled by the cooperation of the crank handle, the rotating shaft and the limit plate; when the push head is extended to the limit position, the pawl and the ratchet can be automatically separated, so that the push head can be retracted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic diagram of the overall structure of the clamping device of the present invention;

[0018] Attached Figure 2 It is a schematic diagram of the connection structure between the rotating shaft and the ejector head;

[0019] Attached Figure 3 Schematic diagram of the structure of the ratchet and pawl. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] As attached Figures 1 to 3 The push-up type clamping device with a one-way travel lock comprises an assembly seat 1, a push-up head 2, a rotating shaft 3, a ratchet 4, a pawl 5 and a posture switching mechanism;

[0022] The push head 2 is retractable; when the workpiece is mounted on the assembly seat 1, the push head 2 can extend toward the assembly seat 1 to push the parts to be assembled onto the workpiece, so as to clamp the workpiece on the assembly seat 1.

[0023] The rotating shaft 3 is in transmission connection with the pushing head 2 through a transmission assembly. When the rotating shaft 3 rotates forward, the pushing head 2 is driven forward. When the rotating shaft 3 rotates reversely, the pushing head 2 is driven back.

[0024] The ratchet 4 is fixedly mounted on the rotating shaft 3, and when the rotating shaft 3 rotates, the ratchet 4 is driven to rotate synchronously.

[0025] The pawl 5 is movably arranged, and the pawl 5 can be moved to a plug-in posture and a disengagement posture. In the plug-in posture, the pawl 5 is correspondingly inserted into the gear teeth of the ratchet 4 and blocks the reverse rotation of the rotating shaft 3. In the disengagement posture, the pawl 5 is separated from the ratchet 4, and the pawl 5 is freed from blocking the reverse rotation of the rotating shaft 3.

[0026] The posture switching mechanism can drive the ratchet 5 to move, so that the ratchet 5 switches to the plugging posture or the separation posture. Moreover, the posture switching mechanism is associated with the push head 2. When the push head 2 extends forward to the limit position, that is, when it extends forward to the maximum stroke, the posture switching mechanism switches the ratchet 5 from the plugging posture to the separation posture to remove the obstacle to the reverse rotation of the rotating shaft 3.

[0027] In summary, during the forward rotation of the shaft 3, the pawl 5 is in the plugging posture, and the pawl 5 is correspondingly inserted into the gear teeth of the ratchet wheel 4, thereby preventing the shaft 3 from reversing. Only when the push head 2 is extended to the limit position, the posture switching mechanism will separate the pawl 5 from the ratchet wheel 4, and then the shaft 3 can be reversed. Therefore, when the clamping device of the present invention is used to assemble the parts to the workpiece, it can be judged whether the push head 2 is extended to the limit position by whether the shaft 3 can be reversed, and then it can be judged whether the part is installed in place.

[0028] The pawl 5 is a swinging member. The pawl 5 can swing to be inserted into the gear teeth of the ratchet wheel 4, at which time the pawl 5 is in a plug-in posture. The pawl 5 can also swing to be separated from the ratchet wheel 4, at which time the pawl 5 is in a separation posture.

[0029] The posture switching mechanism includes a limit plate 6, which is installed on the rotating shaft 3, and the limit plate 6 can rotate synchronously with the rotating shaft 3. The limit plate 6 is associated with the push head 2 through the rotating shaft 3. When the rotating shaft 3 rotates, the position of the push head 2 changes, and correspondingly, the limit plate 6 also changes. A limit groove 7 is provided on the limit plate 6, and the groove edge contour of the limit groove 7 is the limit contour. A slider 15 is connected to the pawl 5, and the slider 15 is correspondingly located in the limit groove 7. During the rotation of the rotating shaft 3, the slider 15 will slide along the limit contour. When the limit plate 6 rotates with the rotating shaft 3, the limit plate 6 can change the position of the slider 15 through the limit contour to drive the pawl 5 to swing, and then make the pawl 5 swing to a plug-in posture or a separation posture.

[0030] The limiting contour is annular and consists of a proximal side 8, a forward switching bevel 9, a distal side 10 and a reverse switching bevel 11 which are connected in sequence. The adjacent sides are connected by smooth transition. The proximal side 8 is the side of the limiting contour close to the rotating shaft 3, and the distal side 10 is the side of the limiting contour far away from the rotating shaft 3. When the slider 15 slides along the proximal side 8, the pawl 5 is in a plug-in posture, at which time the pawl 5 is close to the ratchet 4, and the pawl 5 is correspondingly inserted into the gear teeth of the ratchet 4. When the slider 15 slides along the distal side 10, the pawl 5 is in a separation posture, at which time the pawl 5 is separated from the ratchet 4.

[0031] The actual shape of the limit contour is shown in the attached Figure 2As shown in , specifically, the proximal side 8 and the distal side 10 are arc sides concentric with the rotating shaft 3. When the slider 15 slides on the proximal side 8 or the distal side 10, the actual position of the pawl 5 can be kept unchanged.

[0032] As attached Figure 2 and 3 As shown in , the forward rotation direction of the rotating shaft 3 is counterclockwise, and the reverse rotation direction of the rotating shaft 3 is clockwise. The forward rotation switching bevel 9 gradually tilts from the proximal axis side 8 to the distal axis side 10 toward the reverse direction of the rotating shaft 3. During the forward rotation of the rotating shaft 3, that is, during the rotation of the rotating shaft 3 in the counterclockwise direction, the slider 15 rotates clockwise relative to the limiting groove 7, so the slider 15 on the proximal axis side 8 can gradually slide toward the distal axis side 10 along the forward rotation switching bevel 9.

[0033] The reverse switching bevel 11 gradually tilts from the distal axis side 10 to the proximal axis side 8 in the forward rotation direction of the shaft 3. During the reverse rotation of the shaft 3, that is, during the clockwise rotation of the shaft 3, the slider 15 rotates counterclockwise relative to the limit groove 7. Therefore, the slider 15 on the distal axis side 10 can gradually slide toward the proximal axis side 8 along the reverse switching bevel 11.

[0034] When the push head 2 is extended to the limit position, that is, to the maximum stroke, the slider 15 slides along the positive rotation switching bevel 9, so that the pawl 5 switches from the plug-in posture to the separation posture to remove the obstacle to the reverse rotation of the rotating shaft 3, and then the push head 2 can retract.

[0035] As attached Figure 3 As shown in , an elastic member 12 is connected to the pawl 5, and the pawl 5 drives the elastic member 12 to expand and contract when it swings. When the slider 15 slides along the forward switching bevel 9 or the reverse switching bevel 11, the elastic potential energy of the elastic member 12 will first increase and then decrease, so that the elastic potential energy of the elastic member 12 needs to be overcome before the pawl 5 switches its posture. Therefore, the pawl 5 needs an external force to switch its posture. When no external force is applied, the pawl 5 can stably maintain the plug-in posture or the separated posture.

[0036] As attached Figure 3As shown in , a swing shaft 13 is provided at one end of the pawl 5, and the pawl 5 can rotate around the swing shaft 13. The swing shaft 13 is mounted on a base 14, and a fixing pin 16 is also provided on the base 14. The elastic member 12 is a tension spring, one end of which is connected to the slider 15, and the other end of which is connected to the fixing pin 16. The slider 15 and the fixing pin 16 are respectively located on both sides of the swing shaft 13, and the straight line where the connecting line of the fixing pin 16 and the swing shaft 13 is located is called the swing center line. In the process of the slider 15 sliding along the forward switching bevel 9 or the reverse switching bevel 11, the slider 15 will swing across the swing center line with the pawl 5, so that the distance between the slider 15 and the fixing pin 16 will first increase and then decrease, and accordingly, the tension spring will first stretch and then retract, that is, the elastic potential energy of the elastic member 12 will first increase and then decrease. Therefore, when the slider 15 slides along the proximal axis side 8 and the distal axis side 10 , the slider 15 can be kept in contact with the proximal axis side 8 or the distal axis side 10 under the elastic action of the tension spring.

[0037] The posture switching mechanism further includes a crank 18, one end of which is connected to the rotating shaft 3, and the rotating shaft 3 is driven to rotate when the crank 18 swings. The rotating shaft 3 can be conveniently controlled to rotate by the crank 18.

[0038] The crank 18 is a heavy object. During the swinging process of the crank 18, the gravitational potential energy of the crank 18 will change. During the reversal of the shaft 3, the gravitational potential energy of the crank 18 increases first and then decreases. Accordingly, the crank 18 first swings upward to the highest point, and then swings downward after passing the highest point. During the reversal of the shaft 3, when the crank 18 swings downward, the crank 18 can drive the slider 15 to swing across the swing center line under the action of gravity, and use the gravitational potential energy of the crank 18 to overcome the elastic potential energy of the elastic member 12, so that the pawl 5 is switched from the separation posture to the plug-in posture. In actual use, the operator only needs to swing the crank 18 over the highest point. Under the action of gravity, the crank 18 will continue to swing downward to ensure that the pawl 5 can switch from the separation posture to the plug-in posture.

[0039] As attached Figure 1 and 2 As shown in the figure, the rotating shaft 3 is rotatably mounted on the support 19, and the support 19 is mounted on the bottom plate. The support 19 is also provided with a guide hole 20, which is a horizontal hole. A sliding rod 21 is provided in the guide hole 20, and the sliding rod 21 slides in the guide hole 20. The push head 2 is mounted at the front end of the sliding rod 21. The transmission assembly includes a plurality of connecting rods 22, and the rotating shaft 3 is connected to the rear end of the sliding rod 21 through the plurality of connecting rods 22. When the rotating shaft 3 rotates, the sliding rod 21 is driven to slide in the guide hole 20 through the plurality of connecting rods 22, thereby driving the push head 2 to extend and retract.

[0040] In the attached Figures 1 to 3In one embodiment shown in , there is a T-slot on the assembly seat 1, and a T-shaped workpiece 23 is installed in the T-slot. The three ends of the T-shaped workpiece 23 have openings respectively. It is necessary to insert three columnar parts 17 into the three openings of the T-shaped workpiece 23 respectively, so three push heads 2 are provided. The columnar parts 17 are pushed by the push heads 2. When the crank 18 is shaken in the direction close to the assembly seat 1, the push heads 2 are driven forward by the rotating shaft 3, the connecting rod 22 and the sliding rod 21, and the ratchet 4, the pawl 5 and the posture adjustment mechanism cooperate. Only after the push heads 2 are pushed forward to the limit position, the pawl 5 and the ratchet 4 will separate from each other, and then the crank 18 can be shaken in the direction away from the assembly seat 1. In this way, it can be ensured that the columnar parts 17 are installed in place.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A push-up clamping device with a one-way travel lock, characterized in that: It comprises an assembly seat (1), a push head (2), a rotating shaft (3), a ratchet (4), a ratchet pawl (5) and a posture switching mechanism; The push head (2) is retractable and can extend toward the assembly seat (1) to clamp the workpiece on the assembly seat (1); The rotating shaft (3) is connected to the push head (2) through a transmission assembly. When the rotating shaft (3) rotates forward, the push head (2) is driven forward. When the rotating shaft (3) rotates reversely, the push head (2) is driven back. The ratchet wheel (4) is mounted on the rotating shaft (3), and when the rotating shaft (3) rotates, the ratchet wheel (4) is driven to rotate synchronously; The ratchet (5) is movably arranged, and the ratchet (5) can be moved to a plug-in posture and a disengagement posture; in the plug-in posture, the ratchet (5) is correspondingly inserted into the gear teeth of the ratchet wheel (4) and hinders the reverse rotation of the rotating shaft (3); in the disengagement posture, the ratchet (5) is separated from the ratchet wheel (4), and the obstruction of the ratchet (5) to the reverse rotation of the rotating shaft (3) is released; The posture switching mechanism can drive the ratchet (5) to move, so that the ratchet (5) switches to a plug-in posture or a disconnected posture; The posture switching mechanism is associated with the push head (2); when the push head (2) is extended forward to the limit position, the posture switching mechanism switches the ratchet (5) from the plugging posture to the separation posture, so as to remove the obstacle to the reverse rotation of the rotating shaft (3).

2. A push-up type clamping device with a one-way travel lock according to claim 1, characterized in that: The ratchet pawl (5) is a swinging member; the ratchet pawl (5) can swing to be inserted into the gear teeth of the ratchet wheel (4), or swing to be separated from the ratchet wheel (4).

3. A push-up type clamping device with a one-way travel lock according to claim 2, characterized in that: The posture switching mechanism comprises a limit plate (6), which is mounted on the rotating shaft (3) so that the limit plate (6) is connected to the push head (2) through the rotating shaft (3); a limit groove (7) is provided on the limit plate (6), and the groove edge contour of the limit groove (7) is a limit contour; a slider (15) is connected to the pawl (5), and the slider (15) is located in the limit groove (7) and can slide along the limit contour; when the limit plate (6) rotates with the rotating shaft (3), the limit plate (6) changes the position of the slider (15) through the limit contour, so as to drive the pawl (5) to swing to a plug-in posture or a separation posture.

4. A push-up type clamping device with a one-way travel lock according to claim 3, characterized in that: The limiting contour is annular and is composed of a proximal axis edge (8), a forward rotation switching bevel edge (9), a distal axis edge (10) and a reverse rotation switching bevel edge (11) which are connected in sequence end to end; The proximal side (8) is close to the rotating shaft (3), and the distal side (10) is far away from the rotating shaft (3); when the slider (15) slides along the proximal side (8), the pawl (5) is close to the ratchet wheel (4), and the pawl (5) is inserted into the gear teeth of the ratchet wheel (4); when the slider (15) slides along the distal side (10), the pawl (5) is separated from the ratchet wheel (4); The positive rotation switching bevel (9) gradually tilts from the proximal axis side (8) to the distal axis side (10) in the reverse direction of the rotating shaft (3); during the positive rotation of the rotating shaft (3), the slider (15) on the proximal axis side (8) can slide along the positive rotation switching bevel (9) to the distal axis side (10); The reverse switching bevel (11) gradually tilts from the distal axis side (10) to the proximal axis side (8) toward the forward rotation direction of the rotating shaft (3); during the reverse rotation of the rotating shaft (3), the slider (15) on the distal axis side (10) can slide along the reverse switching bevel (11) toward the proximal axis side (8).

5. A push-up type clamping device with a one-way travel lock according to claim 4, characterized in that: The proximal axis edge (8) and the distal axis edge (10) are both arc edges concentric with the rotation axis (3).

6. A push-up type clamping device with a one-way travel lock according to claim 4, characterized in that: The pawl (5) is connected to an elastic member (12), and when the pawl (5) swings, the elastic member (12) is driven to expand and contract; when the slider (15) slides along the forward switching bevel (9) or the reverse switching bevel (11), the elastic potential energy of the elastic member (12) first increases and then decreases, so that the elastic potential energy of the elastic member (12) needs to be overcome first in the process of switching the posture of the pawl (5).

7. A push-up type clamping device with a one-way travel lock according to claim 6, characterized in that: The pawl (5) is mounted on the base (14) via a swing shaft (13); the elastic member (12) is a tension spring, one end of which is connected to the slider (15), and the other end of which is connected to a fixing pin (16) of the base (14); The slider (15) and the fixed pin (16) are respectively located on both sides of the swing shaft (13), and the straight line connecting the fixed pin (16) and the swing shaft (13) is the swing center line; when the slider (15) slides along the forward switching bevel (9) or the reverse switching bevel (11), the slider (15) swings across the swing center line along the ratchet (5), so that the distance between the slider (15) and the fixed pin (16) first increases and then decreases, and the tension spring first stretches and then retracts.

8. The push-up type clamping device with a one-way travel lock according to claim 7, characterized in that: The posture switching mechanism also includes a crank (18), one end of which is connected to the rotating shaft (3), and when the crank (18) swings, it drives the rotating shaft (3) to rotate.

9. The push-up type clamping device with a one-way travel lock according to claim 8, characterized in that: The crank (18) is a heavy object; during the reverse rotation of the rotating shaft (3), the crank (18) swings down after passing the highest point; when the crank (18) swings down, it can drive the slider (15) to swing across the swing center line under the action of gravity, and switch the ratchet (5) from a separated posture to a plugged posture.

10. The push-up type clamping device with a one-way travel lock according to claim 1, characterized in that: The rotating shaft (3) is rotatably mounted on the support (19); a guide hole (20) is also provided on the support (19), a sliding rod (21) is provided in the guide hole (20), and the push head (2) is mounted at the front end of the sliding rod (21); the transmission assembly comprises a plurality of connecting rods (22), and the rotating shaft (3) is connected to the rear end of the sliding rod (21) through the plurality of connecting rods (22); when the rotating shaft (3) rotates, the sliding rod (21) is driven to slide in the guide hole (20) through the plurality of connecting rods (22), thereby driving the push head (2) to extend and retract.

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