Wire feeding device

Abstract

The utility model discloses a wire rod feeding device which comprises a mounting seat, a feeding driving assembly and two groups of driven assemblies, and the feeding driving assembly comprises a first driving gear, an eccentric mechanism, a rotating shaft, a first driven gear, a one-way transmission mechanism and a connecting rod; the one-way transmission mechanism comprises an inner ratchet wheel, a ratchet wheel core and a plurality of pawl sets arranged on the ratchet wheel core, the number of teeth of the inner ratchet wheel is an even number, the angle of every two adjacent teeth of the inner ratchet wheel is alpha, the number of the teeth is Z, alpha = 360 degrees / Z, the number of the teeth is not in multiple relation with 360 degrees, so that alpha is an infinite decimal, 360 degrees represent the angle of a circle, and Z represents the angle of a circle. One pawl group is propped against teeth of the inner ratchet wheel; the driven assembly comprises a second driving gear, a first feeding wheel, a second driven gear and a second feeding wheel, and the first feeding wheel and the second feeding wheel are matched to convey wires. According to the wire feeding device provided by the utility model, the plurality of pawl groups are matched with the inner ratchet wheel, so that the precision of wire conveying is improved, and the consistency of the conveying lengths of the wires is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of wire material conveying, in particular to a wire material feeding device. Background Art

[0002] Cold heading machine is a device that uses a mold to upset wire at room temperature. It can minimize cutting work and directly form it into the required shape and size. It can not only save materials, but also greatly improve production efficiency and the mechanical strength of upset parts. The cold heading machine needs to use a feeding device during use to realize the forward output of wire.

[0003] The feeding device of the cold heading machine drives the feed wheel to rotate an angle through the pawl driving the ratchet wheel, and the two feed wheels cooperate to convey the wire of a fixed length. The pawl and the ratchet wheel form a one-way transmission mechanism to control the one-way rotation of the feed wheel. However, the transmission accuracy of the existing one-way transmission mechanism is low, which makes the conveying length of the wire inconsistent. When the wire is not fed enough, the product is unqualified and needs to be scrapped; when the wire is fed too much, it causes material waste and increases production costs.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a wire feeding device, aiming to solve the technical problem of low precision in conveying wires.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A wire feeding device, comprising:

[0008] Mounting seat;

[0009] A feeding drive assembly comprises a first driving gear, an eccentric mechanism arranged on the first driving gear, a rotating shaft rotatably connected to a mounting seat, a first driven gear arranged on the rotating shaft, a one-way transmission mechanism arranged on the rotating shaft, and a connecting rod arranged between the one-way transmission mechanism and the eccentric mechanism; the one-way transmission mechanism comprises an inner ratchet, a ratchet core, and a plurality of ratchet pawl groups arranged on the ratchet core, the number of teeth of the inner ratchet is an even number, the angle between two adjacent teeth of the inner ratchet is α, Z is the number of teeth, α=360° / Z, and the number of teeth is not a multiple of 360°, so that α is an infinite decimal, wherein 360° represents the angle of a circle, and one ratchet pawl group abuts against the teeth of the inner ratchet;

[0010] Two sets of driven components include a second driving gear meshed with the first driven gear, a first feeding wheel coaxially connected to the second driving gear, a second driven gear meshed with the second driving gear, and a second feeding wheel coaxially connected to the second driven gear. The first feeding wheel and the second feeding wheel cooperate to convey wire.

[0011] Furthermore, there are more than two pawl groups, and each pawl group includes two pawls that are 180° rotationally symmetrical.

[0012] Furthermore, the pawl includes a rotating portion and an abutting portion, a groove matching with the rotating portion is formed on the ratchet core, and a spring is provided between the abutting portion and the ratchet core.

[0013] Furthermore, a mounting groove is formed in the ratchet core at a position corresponding to the spring, and one end of the spring is arranged in the mounting groove.

[0014] Furthermore, the one-way transmission mechanism also includes a rolling bearing arranged between the ratchet core and the inner ratchet, and a rocker arm arranged on the inner ratchet, and the rocker arm is rotatably connected to the connecting rod.

[0015] Furthermore, the first feeding wheel and the second feeding wheel are provided with circumferentially arranged annular grooves.

[0016] Furthermore, the eccentric mechanism includes a transmission plate coaxially connected to the first driving gear, and an adjustment seat slidably arranged on the transmission plate, the adjustment seat moves toward the rotation center direction of the first driving gear, and the connecting rod is rotationally connected to the adjustment seat.

[0017] Furthermore, the transmission disc is provided with a T-shaped slot, and the adjustment seat is provided with a sliding portion slidably connected to the T-shaped slot.

[0018] Beneficial effect: The wire feeding device provided by the utility model realizes fixed-length wire conveying by forming a one-way transmission mechanism with a plurality of ratchet groups and an inner ratchet; and by setting the number of teeth of the inner ratchet to be an even number, and the number of teeth is not a multiple of 360°, so that when one ratchet group abuts against the next tooth, the remaining ratchet groups abut against the adjacent teeth in turn, thereby reducing the size of the step angle of the inner ratchet, so as to improve the transmission accuracy of the one-way transmission mechanism, thereby improving the accuracy of the wire conveying, and ensuring that the conveying length of the wire is consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the wire feeding device provided by the utility model.

[0020] Figure 2 This is a structural diagram of the wire feeding device provided by the utility model.

[0021] Figure 3This is a schematic diagram of the wire feeding device provided by the utility model when conveying wire.

[0022] Figure 4 for Figure 3 Enlarged view of point M.

[0023] Figure 5 This is a schematic diagram of the wire feeding device provided by the utility model when the wire feeding stops.

[0024] Figure 6 This is an exploded view of the wire feeding device provided by the utility model.

[0025] Figure 7 This is a partial exploded view of the one-way transmission mechanism in the wire feeding device provided by the utility model.

[0026] Figure 8 This is an exploded view of the eccentric mechanism in the wire feeding device provided by the utility model.

[0027] Description of the main component symbols: mounting base 1, feeding drive assembly 2, first driving gear 3, eccentric mechanism 4, transmission plate 41, T-slot 411, adjusting base 42, sliding portion 421, rotating shaft 5, first driven gear 6, one-way transmission mechanism 7, inner ratchet 71, ratchet core 72, groove 721, mounting groove 722, pawl group 73, pawl 731, rotating portion 731a, abutment portion 731b, spring 74, rolling bearing 75, rocker arm 76, connecting rod 8, driven assembly 9, second driving gear 91, first feeding wheel 92, annular groove 921, second driven gear 93, second feeding wheel 94. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-8The utility model provides a wire feeding device, including a mounting seat 1, a feeding drive assembly 2, and two sets of driven assemblies 9, the feeding drive assembly 2 includes a first driving gear 3, an eccentric mechanism 4 arranged on the first driving gear 3, a rotating shaft 5 rotatably connected to the mounting seat 1, a first driven gear 6 arranged on the rotating shaft 5, a one-way transmission mechanism 7 arranged on the rotating shaft 5, and a connecting rod 8 arranged between the one-way transmission mechanism 7 and the eccentric mechanism 4; the one-way transmission mechanism 7 includes an inner ratchet 71, a ratchet core 72, and a plurality of ratchet pawl groups 73 arranged on the ratchet core 72, the number of teeth of the inner ratchet 71 is an even number, and the inner ratchet 71 has an even number of teeth. The angle between two adjacent teeth of the wheel is α, Z is the number of teeth, α=360° / Z, and the number of teeth is not a multiple of 360°, so that α is an infinite decimal, where 360° represents the angle of a circle, and one pawl group 73 abuts against the teeth of the inner ratchet 71; the driven assembly 9 includes a second driving gear 91 meshing with the first driven gear 6, a first feeding wheel 92 coaxially connected to the second driving gear 91, a second driven gear 93 meshing with the second driving gear 91, and a second feeding wheel 94 coaxially connected to the second driven gear 93, and the first feeding wheel 92 and the second feeding wheel 94 cooperate to convey the wire.

[0030] During operation, the first driving gear 3 rotates, and then drives the connecting rod 8 to move through the eccentric mechanism 4. One rotation of the first driving gear 3 is a working cycle. Figure 3 As shown, the first driving gear 3 rotates clockwise, that is, during the process that one end of the connecting rod 8 rotates 180° around the center of the first driving gear 3, the other end of the connecting rod 8 drives the inner ratchet 71 to rotate, and one of the ratchet pawls 73 abuts against the teeth of the adjacent inner ratchet 71, so that the ratchet core 72 drives the rotating shaft 5 to rotate, and then drives the first driven gear 6 to rotate an angle. Since the first driven gear 6 is meshed with the two second driving gears 91, and the second driving gear 91 is meshed with the second driven gear 93, the first feeding wheel 92 and the second feeding wheel 94 cooperate to transport the wire to the right direction; as shown in FIG. Figure 5 As shown, while one end of the connecting rod 8 continues to rotate 180° around the center of the first driving gear 3, the other end of the connecting rod 8 drives the inner ratchet 71 to rotate in the opposite direction. At this time, the teeth of the inner ratchet 71 slide along the pawl group 73, and the rotating shaft 5 and the two groups of driven components 9 are stationary, thereby stopping the wire conveying. After the inner ratchet 71 rotates one circle, one of the pawl groups 73 abuts against the teeth of the adjacent inner ratchet 71 to prepare for entering the next working cycle.

[0031] In the above, the number of teeth Z of the inner ratchet 71 is not a multiple of 360°, that is, 360° is not divisible by the number of teeth Z, so that the angle α between two adjacent teeth of the inner ratchet is an infinite decimal, so that when one pawl group 73 abuts against the teeth of the inner ratchet 71, the remaining pawl groups 73 do not abut against the teeth of the inner ratchet 71, and when the pawl group 73 abuts against the next tooth, the remaining pawl groups 73 abut against the adjacent teeth in sequence. Compared with the prior art, different groups of pawl groups 73 abut against the inner ratchet 71 to reduce the size of the step angle of the inner ratchet 71, thereby improving the transmission accuracy of the one-way transmission mechanism 7, that is, improving the accuracy of the wire transmission, thereby ensuring that the wire transmission length is consistent each time.

[0032] It should be noted that when the number of teeth of the inner ratchet 71 is a multiple of 360°, each pawl group 73 will simultaneously abut against the teeth of the inner ratchet 71, i.e., the purpose of reducing the step angle of the inner ratchet 71 cannot be achieved, and thus the transmission accuracy of the one-way transmission mechanism 7 cannot be improved.

[0033] In a preferred embodiment, there are more than two pawl groups 73 , and each pawl group 73 includes two pawls 731 that are 180° rotationally symmetrical to ensure that the ratchet core 72 is evenly stressed.

[0034] In the prior art, each pawl is in contact with the adjacent teeth, that is, the step angle θ1 in the prior art is the angle between two adjacent teeth of the inner ratchet 71, that is, θ1=α=360° / Z. In this embodiment, when the number of the pawl group 73 is n, the step angle θ2=α / n=360° / (Z×n), therefore, compared with the prior art, the step angle θ2 is 1 / n the step angle θ1, which reduces the size of the step angle of the inner ratchet and improves the transmission accuracy of the one-way transmission mechanism 7.

[0035] Preferably, the inner ratchet 71 has 38 teeth and there are four ratchet groups 73. While ensuring that the teeth of the inner ratchet 71 have sufficient strength, the above arrangement can improve the transmission accuracy of the one-way transmission mechanism 7 by four times compared to the prior art.

[0036] In a preferred embodiment, see Figure 6 , 7 The pawl 731 includes a rotating portion 731a and an abutting portion 731b. The ratchet core 72 is provided with a groove 721 that matches the rotating portion 731a. A spring 74 is provided between the abutting portion 731b and the ratchet core 72. The rotating portion 731a of the pawl 731 is rotatably connected to the groove 721 to limit the position of the pawl 731. Under the action of the spring 74, the pawl 731 always swings toward the teeth of the inner ratchet 71, thereby ensuring that the pawl 731 abuts against the teeth. To further improve the stability of the pawl 731, two springs 74 are provided corresponding to each pawl 731.

[0037] Further, see Figure 7 The ratchet core 72 has a mounting groove 722 at a position corresponding to the spring 74 , and one end of the spring 74 is disposed in the mounting groove 722 to improve the installation stability of the spring 74 .

[0038] In a preferred embodiment, see Figure 7 The one-way transmission mechanism 7 further includes a rolling bearing 75 disposed between the ratchet core 72 and the inner ratchet 71, and a rocker arm 76 disposed on the inner ratchet 71, and the rocker arm 76 is rotatably connected to the connecting rod 8. Specifically, there are two rolling bearings 75, which are respectively disposed at the two ends of the ratchet core 72. The rolling bearings 75 are provided to improve the stability of the rotation of the inner ratchet 71. Similarly, there are two rocker arms 76, which are respectively connected to the two end surfaces of the inner ratchet 71. The connecting rod 8 is rotatably connected to the two rocker arms 76 to improve the stability of the transmission of the connecting rod 8. The rocker arm 76 is provided to achieve driving the inner ratchet 71 to reciprocate at a certain angle.

[0039] In a preferred embodiment, see Figure 2 The first feeding wheel 92 and the second feeding wheel 94 are provided with a circumferentially arranged annular groove 921, and two sets of first feeding wheels 92 and second feeding wheels 94 are provided to limit the conveying direction of the wire and cooperate in conveying the wire forward.

[0040] In a preferred embodiment, see Figure 8 The eccentric mechanism 4 includes a transmission disc 41 coaxially connected to the first driving gear 3, and an adjustment seat 42 slidably arranged on the transmission disc 41, the adjustment seat 42 moves toward the rotation center direction of the first driving gear 3, and the connecting rod 8 is rotatably connected to the adjustment seat 42. By changing the position of the adjustment seat 42 on the transmission disc 41, the rotation angle of the inner ratchet 71 around the rotating shaft 5 can be adjusted to adjust the output length of the wire.

[0041] Furthermore, the transmission disc 41 is provided with a T-slot 411, and the adjustment seat 42 is provided with a sliding portion 421 slidably connected to the T-slot 411. Specifically, an adjusting screw is rotatably connected to the transmission disc 41, and the adjusting screw is threadedly connected to the adjustment seat 42. The adjusting screw is rotated to drive the sliding portion 421 to slide along the T-slot 411, thereby adjusting the position of the adjustment seat 42 on the T-slot 411, wherein the adjusting screw is not drawn in the drawings.

[0042] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. A wire feeding device, characterized in that: include: Mounting seat; A feeding drive assembly comprises a first driving gear, an eccentric mechanism arranged on the first driving gear, a rotating shaft rotatably connected to a mounting seat, a first driven gear arranged on the rotating shaft, a one-way transmission mechanism arranged on the rotating shaft, and a connecting rod arranged between the one-way transmission mechanism and the eccentric mechanism; the one-way transmission mechanism comprises an inner ratchet, a ratchet core, and a plurality of ratchet pawl groups arranged on the ratchet core, the number of teeth of the inner ratchet is an even number, the angle between two adjacent teeth of the inner ratchet is α, Z is the number of teeth, α=360° / Z, and the number of teeth is not a multiple of 360°, so that α is an infinite decimal, wherein 360° represents the angle of a circle, and one ratchet pawl group abuts against the teeth of the inner ratchet; Two sets of driven components include a second driving gear meshed with the first driven gear, a first feeding wheel coaxially connected to the second driving gear, a second driven gear meshed with the second driving gear, and a second feeding wheel coaxially connected to the second driven gear. The first feeding wheel and the second feeding wheel cooperate to convey wire.

2. The wire feeding device according to claim 1, characterized in that: There are more than two pawl groups, and each pawl group includes two pawls that are 180° rotationally symmetrical.

3. The wire feeding device according to claim 1, characterized in that: The pawl comprises a rotating part and an abutting part. A groove matching with the rotating part is provided on the ratchet core. A spring is arranged between the abutting part and the ratchet core.

4. The wire feeding device according to claim 3, characterized in that: The ratchet core is provided with an installation groove at a position corresponding to the spring, and one end of the spring is arranged in the installation groove.

5. The wire feeding device according to claim 1, characterized in that: The one-way transmission mechanism also includes a rolling bearing arranged between the ratchet core and the inner ratchet, and a rocker arm arranged on the inner ratchet, and the rocker arm is rotatably connected to the connecting rod.

6. The wire feeding device according to claim 1, characterized in that: The first feeding wheel and the second feeding wheel are provided with circumferentially arranged annular grooves.

7. The wire feeding device according to claim 1, characterized in that: The eccentric mechanism comprises a transmission plate coaxially connected to the first driving gear and an adjustment seat slidably arranged on the transmission plate. The adjustment seat moves toward the rotation center direction of the first driving gear, and the connecting rod is rotationally connected to the adjustment seat.

8. The wire feeding device according to claim 7, characterized in that: The transmission disc is provided with a T-shaped slot, and the adjusting seat is provided with a sliding part which is slidably connected with the T-shaped slot.

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