Inserting piece feeding mechanism

Abstract

The invention relates to the technical field of feeding devices, in particular to an inserting piece feeding mechanism which comprises a conveying part, a feeding part, a feeding part, a feeding part and a discharging part. The conveying part comprises a plurality of conveying runners arranged in the width direction of the conveying part; the material taking mechanism comprises a material taking piece with a plurality of material taking heads, and the material taking heads are used for fixing the inserting pieces conveyed by the conveying runner; the material taking heads are evenly distributed in the width direction of the conveying piece. The material taking head at least can move in the width direction of the conveying piece. Each conveying runner is provided with a feeding port and a discharging port, and the feeding ports and the discharging ports are evenly distributed in the width direction of the conveying piece at intervals. The distance between every two adjacent feeding ports is smaller than the distance between every two adjacent discharging ports. The material taking head is provided with a material taking end, and the size of the material taking end is smaller than or equal to the distance between every two adjacent discharging ports in the width direction of the conveying piece.

Description

Technical Field

[0001] The present invention relates to the technical field of feeding devices, and particularly relates to an insert feeding mechanism. Background Art

[0002] During the assembly process of acupuncture needles, the insert, as a key component for fixing the acupuncture needle in the plastic tube, has a small size and requires high-precision equipment to achieve directional arrangement and transportation. The prior art usually uses a vibrator to initially sort and feed the inserts. After the inserts enter the conveying channel, a linear vibrator is used to transfer them to the next position. However, with the continuous improvement of the assembly efficiency requirements, it is necessary to process multiple columns of inserts simultaneously, that is, to increase the number of discharge holes of the vibrator and the number of conveying channels. In this case, the vibrator and the linear vibrator need to drive a larger load mass, resulting in a significant increase in the power requirements of both. Research shows that taking the vibrator as an example, the power of the vibrator is positively correlated with the number of discharge holes. When synchronously transporting more inserts, the energy consumption and structural complexity of the vibrator increase simultaneously. The existing insert assembly equipment has obvious defects: First, there is a contradiction between power and efficiency. To achieve synchronous transportation of multiple inserts, high-power vibrators and linear vibrators need to be configured, and then high-power motors need to be used. However, high-power motors not only have a large volume and high cost, but also are prone to heat generation during long-term operation, seriously affecting the stability of the equipment. Second, the structural space is limited. Synchronous transportation of multiple inserts requires a multi-channel layout, which requires a large amount of equipment space.

[0003] Therefore, how to solve the above deficiencies of the prior art has become the subject to be studied and solved in the present invention. Summary of the Invention

[0004] The purpose of the present invention is to provide an insert feeding mechanism.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: An insert feeding mechanism, comprising: A conveying member, including a plurality of conveying channels arranged along the width direction of the conveying member; A picking mechanism, including a picking member having a plurality of picking heads, and the picking heads are used to fix the inserts conveyed by the conveying channels; Wherein, the picking heads are evenly distributed in the width direction of the conveying member; the picking heads can at least move along the width direction of the conveying member; All the conveying channels have a feed port and a discharge port, and the feed ports and the discharge ports are respectively evenly spaced along the width direction of the conveying member; The distance between two adjacent feed ports is less than the distance between two adjacent discharge ports; The material taking head has a material taking end, and in the width direction of the conveying member, the size of the material taking end is less than or equal to the distance between two adjacent discharge ports.

[0006] It should be noted that the insert is relatively small in size. Generally, a vibrator (or a vibrating disk) or a similar device is used for preliminary sorting and feeding, and then a linear vibrator (or a linear vibrating device) or a similar device is used to transfer the inserts entering the conveying channel. Here, the vibrator and the linear vibrator are used for illustration. The vibrator and the linear vibrator can both be regarded as parts of the insert feeding and conveying line of the present application. When the number of discharge holes of the vibrator is more, higher power is required to meet the feeding progress of the inserts. Similarly, when the number of conveying channels is more, higher power is required for the linear vibrator, which in turn leads to higher costs and larger space requirements for the insert feeding and conveying line.

[0007] Regarding the above power, the following supplementary explanation is provided to help understanding: For the vibrator, an increase in the number of discharge holes means an increase in the number of inserts conveyed simultaneously. The vibrator needs to drive a larger load mass, and a higher load requires a larger driving force to maintain the vibration amplitude and frequency to ensure the feeding speed, resulting in an increase in power demand.

[0008] The vibrator and the linear vibrator are existing devices, and their principles refer to the prior art. A simple description is as follows: The vibrator uses the vibration generated by the vibration motor to make the inserts orderly arranged in the disk along a specific track and conveyed to the discharge holes; the linear vibrator is used to achieve the linear conveying and directional arrangement of the materials.

[0009] During the feeding process, the inserts enter the conveying channel from the feeding port and leave the conveying channel from the discharge port, completing the first stage of insert feeding; in the second stage, the material taking end is fixed and the inserts conveyed by the conveying channel are transferred. A single material taking member simultaneously fixes and transfers multiple inserts through the multiple material taking ends of multiple material taking heads.

[0010] During the insert transfer process, in the case of a limited number of conveying channels, each material taking head takes materials at staggered times so that each material taking head can fix an insert, ensuring the insert feeding progress.

[0011] Each material taking head is evenly distributed in the width direction of the conveying member, and each discharge port is evenly spaced along the width direction of the conveying member. These settings provide a basis for stably realizing the staggered material taking of each material taking head and facilitate each material taking head to align with one of the discharge ports in turn.

[0012] Each feeding port is evenly spaced along the width direction of the conveying member. On the one hand, it reduces the difficulty of modifying the conveying member, and on the other hand, it facilitates the precise docking of the conveying member with the vibrator.

[0013] In the width direction of the conveyor, the size of the feeding end is less than or equal to the distance between two adjacent discharge ports, as explained below: when the size of the feeding end is less than the distance between two adjacent discharge ports, more feeding heads can be used for staggered feeding; when the size of the feeding end is not greater than the distance between two adjacent discharge ports, more feeding methods can be adapted. For example, if the size of the feeding end is greater than the distance between two adjacent discharge ports, the center of each feeding end is difficult to align with the center of the insert, and the stability of the insert during the adsorption process cannot be guaranteed.

[0014] In summary, the staggered material collection method can ensure the insert feeding speed when the number of conveying channels is limited, reduce the size of the conveying parts, reduce the power requirements of devices such as vibrators and straight vibrators, and reduce the cost and required space of the insert feeding conveyor line. In addition, fewer conveying channels can also reduce the risk of accidents in the insert conveying process, and ultimately ensure the operating stability of the insert feeding conveyor line.

[0015] Taking the material picking mechanism as an example, the material picking head fixes the insert and transfers it to the final loading position. Even if the relevant structure is not explicitly mentioned, those skilled in the art should know that the material picking head can be moved on the x-axis, y-axis and z-axis with the help of existing electric slides and other devices.

[0016] According to a further technical solution, each of the delivery channels forms a channel group, and the channel group includes a first delivery channel, at least one second delivery channel and at least one third delivery channel; The length direction of the first conveying channel is parallel to the length direction of the conveying member; The number of the second conveying channels is the same as that of the third conveying channels; The second conveying channels form a first channel group, the third conveying channels form a second channel group, and the first channel group and the second channel group are symmetrically arranged with the axis of the first conveying channel as a symmetry line; The second conveying channel comprises a first section and a second section which are smoothly connected, the length direction of the first section is parallel to the length direction of the conveying member, and part of the second section is an arc section; The end of the second section facing away from the first section extends along the length direction of the conveying member.

[0017] In this embodiment, each conveying channel is divided into a first conveying channel, a second conveying channel and a third conveying channel.

[0018] Here, the first conveying channel, the second conveying channel and the third conveying channel are all single for illustration: in the width direction of the conveying member, the second conveying channel and the third conveying channel are symmetrically distributed on both sides of the first conveying channel. The symmetrical layout is conducive to processing the conveying member.

[0019] The length direction of the first conveying channel is parallel to the length direction of the conveying member. In the second conveying channel, the length direction of the first section and the end of the second section facing away from the first section (which can be generally summarized as the two ends of the second conveying channel) both extend along the length direction of the conveying member, facilitating the insertion piece to enter the conveying channel and move out of the conveying channel in a predetermined posture. Here, it is provided that the insertion piece has a first end and a second end along its own length direction. When the insertion piece is assembled with the plastic tube, the first end or the second end is inserted into the plastic tube. Here, it is provided that the insertion piece has a straight posture, that is, its length direction is parallel to a predetermined direction (such as the length direction of the plastic tube, the length direction of the conveying member). The insertion piece is in a straight posture when output from the above-mentioned vibrator. In this embodiment, the settings of the length direction of the first conveying channel and the like enable the insertion piece to enter the conveying channel in a straight posture and also move out of the conveying channel in a straight posture, so that no posture adjustment is required for the insertion piece in the subsequent transfer stage, reducing the operation steps and improving the assembly success rate of the insertion piece and the plastic tube. If the insertion piece approaches the plastic tube obliquely, the assembly probability will decrease due to factors such as the obstruction of the end of the plastic tube to the insertion piece.

[0020] Generally, the conveying member is located between the vibrator and the plastic tube conveying device. Taking the conveying member as a square structure for illustration, the ideal situation is that the vibrator outputs a straight posture insertion piece, and the insertion piece enters the conveying channel in a straight posture and then is assembled with the plastic tube in a straight posture. Based on the ideal situation, in this embodiment, the structural directions of the first section and the like are restricted to enable the insertion piece to be assembled with the plastic tube in a straight posture, and also to enable the insertion pieces to gradually increase the distance between them in the conveying channel so as to facilitate the following material receiving groove to receive the insertion pieces in a staggered manner, and to ensure the flow speed of the insertion pieces in the conveying channel.

[0021] A further technical solution is that in this embodiment, there is also a staggered material receiving mechanism, including: A material receiving member having a plurality of material receiving grooves uniformly arranged along the width direction of the conveying member, the material receiving grooves corresponding to the discharge ports and having the same number as the number of the material taking ends; A first driving member connected to the material receiving member for driving the material receiving member to move at least along the width direction of the conveying member.

[0022] The insertion piece moves out of the conveying channel from the discharge port and enters the material receiving groove. After the insertion piece enters the material receiving groove, it can be free from the obstruction of the wall of the conveying channel during the process of the material taking head driving the insertion piece vertically. The shape of the material receiving groove can refer to the attached drawings, and it has two openings, one of which faces the conveying channel and the other faces upward.

[0023] For ease of understanding, an example of a transfer process of the insert is given here to illustrate: two discharge ports are set, and four material receiving slots are set; initially, the two discharge ports are aligned with two of the material receiving slots; when the two inserts are transferred into the two material receiving slots, the material receiving member is driven by the first driving member so that the two discharge ports are aligned with the other two material receiving slots; when the other two inserts are transferred into the two successive material receiving slots, the material receiving member is continued to be driven by the first driving member so that the two discharge ports are not aligned with any material receiving slots; finally, the inserts are taken out, and the previous process is repeated.

[0024] When the material is directly taken from the discharge port by the material taking head, it is impossible to prevent the plug from separating from the conveying channel in the non-discharging stage, and it is only possible to control the transportation process of the plug in the conveying channel. With the help of the dislocation receiving mechanism, in the process of replacing the receiving plug in the receiving trough and taking out the plug from the receiving trough by the material taking head, the partition between the receiving troughs (which belongs to the receiving part) can be used to prevent the plug from separating from the conveying channel.

[0025] With the help of the staggered material receiving mechanism, the material picking frequency of the material picking head is reduced. For example, when fixing ten inserts, the material picking head originally needed to pick up materials twice, fixing five inserts each time. Now the material picking head can fix ten inserts at a time, thereby improving the overall transfer progress of the inserts.

[0026] According to a further technical solution, the material receiving member is arranged parallel to the adjacent surface of the conveying member, and the distance between the two adjacent surfaces is smaller than the dimension of the insert in the length direction of the conveying member.

[0027] The material receiving member and the conveying member are two parallel square structures for illustration. At this time, one surface of the material receiving member faces the conveying member, and this surface is the adjacent surface in this embodiment.

[0028] The adjacent surfaces of the receiving member and the conveying member are arranged in parallel, so that the inserts leaving the conveying channel from any outlet are arranged parallel to each other after entering the receiving member, which can facilitate the subsequent transfer process of the inserts.

[0029] When there is a distance between the adjacent surfaces of the receiving piece and the conveying piece, there is no friction when the two move relative to each other, which avoids affecting the relative movement process of the two and avoiding wear on both. The distance between the two adjacent surfaces is smaller than the size of the insert in the length direction of the conveying piece, which can prevent the insert from getting stuck between the two adjacent surfaces or falling to the ground after moving out of the conveying channel. Of course, the insert generally has inertia after moving out of the conveying channel and can continue to move. In some embodiments, the distance between the two adjacent surfaces can be set to be equal to or greater than the size of the insert in the length direction of the conveying piece within a certain range. The specific reference to the adjacent surfaces in this section refers to the description in this embodiment, and even if it is not explicitly stated, it should be known to those skilled in the art.

[0030] A further technical solution. In this embodiment, it further includes an insert mounting mechanism disposed on one side of the material taking mechanism. The insert mounting mechanism includes: A support base; A receiving base fixedly disposed on the support base and having a plurality of receiving grooves for receiving the inserts transferred by the material taking head. The number of the receiving grooves is the same as the number of the material taking heads; A plurality of pressing members, the number of which is the same as the number of the receiving grooves, including a push head, a force value adjusting spring and a force value sensor connected in sequence. The push head corresponds to the receiving groove; A sliding seat connected to each of the force value sensors and slidably connected to the support base; A second driving member connected to the support base and the sliding seat.

[0031] In the insert mounting mechanism, the driving source is the second driving member, but the structure actually contacting the insert is the push head. Under the indirect action of the second driving member, the push head pushes the insert transferred into the receiving groove to be assembled with the plastic tube.

[0032] When inserting the insert, the insert is pushed by the push head. In this process, there are problems such as the plastic tube being damaged due to excessive thrust and the insert being inserted too deep, which affects the extraction of the acupuncture needle. Based on this, it is regulated by the force value adjusting spring. Under normal circumstances, the force value adjusting spring does not deform. When the resistance received by the insert exceeds the set threshold, the force value adjusting spring deforms so that the insert cannot continue to penetrate into the plastic tube. The force value sensor is used to detect the force condition of the force value adjusting spring.

[0033] Each force value adjusting spring is independently regulated, so that the insertion processes of the inserts are independent of each other.

[0034] A further technical solution. In this embodiment, the insert mounting mechanism further includes: A moving seat connected to each of the force value sensors and slidably connected to the sliding seat; A third driving member connected to the moving seat; A collecting member connected to the receiving base for collecting the inserts that have not been assembled.

[0035] In this embodiment, the moving seat is used as an intermediate structure between the force value sensor and the sliding seat, so that the force value sensor can move relative to the sliding seat.

[0036] Considering the difficulty of inserting the insert into the plastic tube, there are cases where some inserts are not inserted into the plastic tube. These inserts will affect the subsequent continuous assembly process of the inserts. Therefore, these inserts need to be transferred to the collecting member in time, and this process is set as the insert secondary re-pushing process.

[0037] During the secondary re-pushing process of the inserted piece, the third driving member replaces the second driving member. The third driving member drives each force value sensor through the moving seat, and the subsequent process refers to the above.

[0038] It should be noted that in order to avoid damage to the plastic tube during the process of inserting the inserted piece into the plastic tube, the driving distance of the second driving member is limited. If the second driving member is used to complete the secondary re-pushing process of the inserted piece, it is difficult to ensure that the unassembled inserted pieces enter the collecting member. By using the third driving member, the driving distance of the third driving member can be adjusted flexibly to ensure that the unassembled inserted pieces enter the collecting member, thus ensuring the continuous assembly of the subsequent inserted pieces.

[0039] A further technical solution. In this embodiment, it further includes a material receiving mechanism, and the material receiving mechanism includes: A fourth driving member; A material taking member connected to the fourth driving member, including at least two groups of material taking parts distributed along the width direction of the material taking member, and each group of material taking parts includes a plurality of material taking parts distributed in parallel along the length direction of the material taking member; In the width direction of the material taking member, the projection parts of any two of the material taking parts overlap or are separated.

[0040] The way of taking materials by the material taking part is not specifically limited here. Electric or pneumatic grippers can be used to implement clamping and taking materials, or existing adsorption devices can be used to implement vacuum adsorption and taking materials.

[0041] Taking the example that the material taking member includes two groups of material taking parts: The material taking parts in the two groups of material taking parts are staggeredly distributed in the width direction of the material taking member (the projections can partially overlap), so as to avoid being unable to achieve the predetermined material taking quantity due to the large size of the material taking part.

[0042] For further understanding, it is supplemented and explained here: Set a material taking area and there are ten qualified products distributed at intervals along the length direction of the material taking member in the material taking area. If the material taking parts are arranged in parallel along the length direction of the material taking member, only five can be placed. The staggered placement method can complete the material taking work of ten qualified products at the same time without expanding the material taking area.

[0043] The material taking member includes at least two groups of material taking parts distributed along the width direction of the material taking member, and each group of material taking parts includes a plurality of material taking parts distributed in parallel along the length direction of the material taking member. Here, the width direction and the length direction can be interchanged.

[0044] A further technical solution. In this embodiment, the material receiving mechanism further includes: A support table with a support surface inclined downward; A receiving member movably arranged on the support surface, and a plurality of the receiving members are provided, and the receiving members are distributed at intervals along the length direction of the support surface; The limiting member is movably disposed on the support table and is arranged corresponding to the storage member.

[0045] For the convenience of understanding, an example is given to illustrate the working process of the structures involved in this embodiment: Under the action of the limiting member, three storage members are stably arranged at intervals on the support surface. Initially, one of the storage members is in the storage area, and the positions of the other two storage members are higher than the storage area. When the storage member in the storage area completes storage, the limiting member moves downward to release the limitation on each storage member. After each storage member moves a certain distance, the limiting member resets, so that the subsequent storage member to take over stays in the storage area.

[0046] The support surface is inclined downward, so that the storage members can take over and enter the above-mentioned storage area under the action of gravity to complete the storage work of qualified products, reducing manual operation and improving the efficiency of the storage members taking over and using.

[0047] The setting of the limiting member enables the storage members to be stably in the storage area, and in the takeover stage of the storage members, the limiting member enables the storage members to accurately stay in the storage area, further reducing manual operation and further improving the efficiency of the storage members taking over and using.

[0048] Regarding the "first", "second", etc. used in this article, they do not particularly refer to the meaning of order or sequence, nor are they used to limit this case. They are only used to distinguish components or operations described with the same technical terms.

[0049] Regarding the "connection" or "positioning" used in this article, it can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, and can also refer to two or more components or devices operating or acting on each other.

[0050] Regarding the "including", "comprising", "having", etc. used in this article, they are all open-ended terms, that is, they mean including but not limited to.

[0051] Regarding the terms used in this article, unless otherwise specified, they usually have their ordinary meanings in this field, in the context of this case, and in the special context. Some terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in the description of this case.

[0052] Regarding the "front", "rear", "upper", "lower", "left", "right", etc. used in this article, they are all directional terms. In this case, they are only used to illustrate the positional relationship between the structures and are not used to limit the protection scheme of this case and the specific direction during actual implementation.

[0053] The working principle and advantages of the present invention are as follows: The insert enters the conveying channel from the feeding port and leaves the conveying channel from the discharging port, completing the first stage of the insert loading; in the second stage, the picking end fixes and transfers the insert conveyed by the conveying channel, and a single picking member simultaneously fixes and transfers multiple inserts through the multiple picking ends of multiple picking heads.

[0054] During the transfer of the insert, in the case of a limited number of conveying channels, each picking head can fix an insert through staggered picking, ensuring the progress of the insert loading.

[0055] Each picking head is evenly distributed in the width direction of the conveying member, and each discharging port is evenly spaced in the width direction of the conveying member respectively. These settings provide a basis for stably realizing the staggered picking of each picking head, facilitating each picking head to align with one of the discharging ports in turn.

[0056] Each feeding port is evenly spaced in the width direction of the conveying member. On the one hand, it reduces the difficulty of modifying the conveying member. On the other hand, it facilitates the precise docking of the conveying member with the vibrator.

[0057] In the width direction of the conveying member, the size of the picking end is less than or equal to the distance between two adjacent discharging ports. When the size of the picking end is less than the distance between two adjacent discharging ports, more picking heads can perform staggered picking; when the size of the picking end is not greater than the distance between two adjacent discharging ports, more picking methods can be adapted.

[0058] In summary, adopting the method of staggered picking can ensure the insert loading speed in the case of a limited number of conveying channels, reduce the size of the conveying member, while reducing the requirements for the power of devices such as vibrators and linear vibrators, reducing the cost and required space of the insert loading conveying line. In addition, fewer conveying channels can also reduce the risk of accidents during the insert conveying process, ultimately ensuring the operation stability of the insert loading conveying line. Description of the Drawings

[0059] Figure 1 It is a schematic diagram of the overall structure of an insert loading mechanism according to an embodiment of the present invention; Figure 2 It is a schematic diagram of a partial structure of an insert loading mechanism according to an embodiment of the present invention; Figure 3 It is Figure 2 the top view of; Figure 4 It is Figure 2 the enlarged view at A in; Figure 5 It is a schematic diagram of a partial structure of an insert loading mechanism according to an embodiment of the present invention; Figure 6 It is Figure 5 the structure diagram from another perspective; Figure 7for Figure 5 A structural diagram from another perspective; Figure 8 This is a third partial structural schematic diagram of a sheet feeding mechanism according to an embodiment of the present invention; Figure 9 for Figure 8 Schematic diagram of the structure from another perspective.

[0060] In the above figures: 1, conveying member; 11, conveying channel; 111, feeding port; 12, first conveying channel; 13, second conveying channel; 131, first section; 132, second section; 14, third conveying channel; 2, material taking mechanism; 21, material taking head; 211, material taking end; 3, vibrator; 4, straight vibrator; 5, dislocation material receiving mechanism; 51, material receiving member; 511, material receiving trough; 52, first driving member; 6, insert installation mechanism ; 61. Support seat; 62. Receiver seat; 621. Receiver groove; 63. Press-in piece; 631. Pusher head; 632. Force adjustment spring; 633. Force sensor; 64. Sliding seat; 65. Second drive member; 66. Moving seat; 67. Third drive member; 68. Collecting member; 7. Material collecting mechanism; 71. Fourth drive member; 72. Material picking member; 721. Material picking section; 73. Support table; 74. Storage member; 75. Limiting member. DETAILED DESCRIPTION

[0061] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0062] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0063] See also Figures 1-9 , a sheet feeding mechanism, comprising: The conveying member 1 comprises a plurality of conveying channels 11 arranged along the width direction of the conveying member 1; The material taking mechanism 2 comprises a material taking member (set as a first material taking member) having a plurality of material taking heads 21, wherein the material taking heads 21 are used to fix the inserts conveyed by the conveying channel 11; The material taking heads 21 are evenly distributed in the width direction of the conveyor 1; the material taking heads 21 can at least move along the width direction of the conveyor 1; The conveying channels 11 all have a feed inlet 111 and a discharge outlet, and each of the feed inlets 111 and each of the discharge outlets are evenly spaced along the width direction of the conveying member 1; The distance between two adjacent feed inlets 111 is less than the distance between two adjacent discharge outlets; The picking head 21 has a picking end 211, and in the width direction of the conveying member 1, the size of the picking end 211 is less than or equal to the distance between two adjacent discharge outlets.

[0064] It should be noted that the insert pieces are small in size. Generally, a vibrator 3 (or a vibrating bowl) or a similar device is used for preliminary sorting and feeding. Subsequently, a linear vibrator 4 (or a linear vibrating device) or a similar device is used to transfer the insert pieces entering the conveying channel 11. Here, the vibrator 3 and the linear vibrator 4 are used for illustration. The vibrator 3 and the linear vibrator 4 can be regarded as parts of the insert piece feeding and conveying line of the present application. When the number of discharge holes of the vibrator 3 is more, higher power is required to meet the feeding progress of the insert pieces. Similarly, when the number of conveying channels 11 is more, higher power is required for the linear vibrator 4, which results in a higher cost and a larger required space for the insert piece feeding and conveying line.

[0065] The following supplementary description is provided regarding the above power to assist in understanding: For the vibrator 3, an increase in the number of discharge holes means an increase in the number of insert pieces conveyed simultaneously. The vibrator 3 needs to drive a larger load mass, and a higher load requires a larger driving force to maintain the vibration amplitude and frequency to ensure the feeding speed, thereby resulting in an increase in power demand.

[0066] The vibrator 3 and the linear vibrator 4 are existing devices, and the principle refers to the prior art. A brief description is as follows: The vibrator 3 uses the vibration generated by a vibration motor to make the insert pieces orderly arranged in the tray along a specific track and conveyed to the discharge holes; the linear vibrator 4 is used to achieve the linear conveying and directional arrangement of the materials.

[0067] During the feeding process, the insert pieces enter the conveying channel 11 from the feed inlet 111 and leave the conveying channel 11 from the discharge outlet, completing the first stage of the insert piece feeding; in the second stage, the picking end 211 fixes and transfers the insert pieces conveyed by the conveying channel 11, and a single picking member simultaneously fixes and transfers multiple insert pieces through the multiple picking ends 211 of the multiple picking heads 21.

[0068] During the insert piece transfer process, when the number of conveying channels 11 is limited, each picking head 21 picks materials at different times so that each picking head 21 can fix an insert piece, ensuring the feeding progress of the insert pieces.

[0069] Each material taking head 21 is evenly distributed in the width direction of the conveying member 1, and each discharge port is evenly spaced in the width direction of the conveying member 1 respectively. These settings provide a basis for stably realizing the staggered material taking of each material taking head 21, and facilitate each material taking head 21 to align with one of the discharge ports in turn.

[0070] Each feed port 111 is evenly spaced in the width direction of the conveying member 1. On the one hand, it reduces the difficulty of modifying the conveying member 1. On the other hand, it facilitates the precise docking of the conveying member 1 with the vibrator 3.

[0071] In the width direction of the conveying member 1, the size of the material taking end 211 is less than or equal to the distance between two adjacent discharge ports. The explanation is as follows: When the size of the material taking end 211 is less than the distance between two adjacent discharge ports, more material taking heads 21 can perform staggered material taking; when the size of the material taking end 211 is not greater than the distance between two adjacent discharge ports, more material taking methods can be adapted. Taking the adsorption material taking method as an example, if the size of the material taking end 211 is greater than the distance between two adjacent discharge ports, it is difficult for the centers of each material taking end 211 to align with the center of the insert piece, and the stability of the insert piece during the adsorption process cannot be guaranteed.

[0072] In summary, adopting the staggered material taking method can ensure the feeding speed of the insert pieces when the number of conveying channels 11 is limited, reduce the size of the conveying member 1, and at the same time reduce the requirements for the power of devices such as the vibrator 3 and the linear vibrator 4, reduce the cost and required space of the insert piece feeding conveyor line. In addition, fewer conveying channels 11 can also reduce the risk of accidents during the insert piece conveying process, and ultimately ensure the operation stability of the insert piece feeding conveyor line.

[0073] Taking the material taking mechanism 2 as an example for illustration, after the material taking head 21 fixes the insert piece and transfers it to the final feeding position, even if the relevant structure is not explicitly mentioned, those skilled in the art should also know that the movement of the material taking head 21 on the x-axis, y-axis and z-axis can be realized by means of existing electric sliding tables and other devices.

[0074] The specific relative positions of the structures in this application can be referred to the attached drawings, but the positions in the attached drawings are only one implementable way.

[0075] See Figure 4 , in this embodiment, each of the conveying channels 11 forms a channel group, and the channel group includes a first conveying channel 12, at least one second conveying channel 13 and at least one third conveying channel 14; The length direction of the first conveying channel 12 is parallel to the length direction of the conveying member 1; The number of the second conveying channels 13 is the same as that of the third conveying channels 14; Each of the second conveying channels 13 forms a first channel group, and each of the third conveying channels 14 forms a second channel group. The first channel group and the second channel group are symmetrically arranged with the axis of the first conveying channel 12 as the symmetry line; The second conveying channel 13 includes a first section 131 and a second section 132 that are smoothly connected. The length direction of the first section 131 is parallel to the length direction of the conveying member 1, and a part of the second section 132 is an arc section; The end of the second section 132 facing away from the first section 131 extends along the length direction of the conveying member 1.

[0076] In this embodiment, each conveying channel 11 is divided into a first conveying channel 12, a second conveying channel 13, and a third conveying channel 14.

[0077] Here, taking the first conveying channel 12, the second conveying channel 13, and the third conveying channel 14 as single ones for example: in the width direction of the conveying member 1, the second conveying channel 13 and the third conveying channel 14 are symmetrically distributed on both sides of the first conveying channel 12. The symmetric layout is beneficial for processing the conveying member 1.

[0078] The length direction of the first conveying channel 12 is parallel to the length direction of the conveying member 1. In the second conveying channel 13, the length direction of the first section 131 and the end of the second section 132 facing away from the first section 131 (which can be generally regarded as the two ends of the second conveying channel 13) both extend along the length direction of the conveying member 1, facilitating the insertion piece to enter the conveying channel 11 and move out of the conveying channel 11 in a predetermined posture. Here, it is set that the insertion piece has a first end and a second end along its own length direction. When the insertion piece is assembled with the plastic tube, the first end or the second end is inserted into the plastic tube. Here, it is set that the insertion piece has a straight posture, that is, its length direction is parallel to the predetermined direction (such as the length direction of the plastic tube, the length direction of the conveying member 1). The insertion piece is in a straight posture when output from the above-mentioned vibrator 3. In this embodiment, the settings such as the length direction of the first conveying channel 12 enable the insertion piece to enter the conveying channel 11 in a straight posture and also be able to move out of the conveying channel 11 in a straight posture, so that the posture adjustment of the insertion piece is not required in the subsequent transfer stage, reducing the operation steps and improving the assembly success rate of the insertion piece and the plastic tube. If the insertion piece approaches the plastic tube obliquely, the assembly probability will decrease due to factors such as the insertion piece being blocked by the end of the plastic tube.

[0079] Under normal circumstances, the conveying member 1 is located between the vibrator 3 and the plastic pipe conveying device. Taking the conveying member 1 as a square structure for illustration, the ideal situation is as follows: the vibrator 3 outputs inserts in a straight posture, and the inserts enter the conveying channel 11 in a straight posture and then are assembled with the plastic pipe in a straight posture. Based on the ideal situation, in this embodiment, the structural directions of the first section 131 and the like are restricted to enable the inserts to be assembled with the plastic pipe in a straight posture, and also to enable the inserts to gradually increase the separation distance in the conveying channel 11 so as to facilitate the staggered reception of the inserts by the following receiving slots 511, and to ensure the flow velocity of the inserts in the conveying channel 11.

[0080] In some embodiments, the number of the second conveying channels 13 and the third conveying channels 14 is different. Specifically, the second conveying channels 13 are one more than the third conveying channels 14. When ignoring this extra channel, the first channel group and the second channel group can be regarded as a symmetric structure.

[0081] See Figures 2-4 , in this embodiment, it further includes a staggered material receiving mechanism 5, including: A material receiving member 51, having a plurality of receiving slots 511 uniformly arranged along the width direction of the conveying member 1, the receiving slots 511 are arranged corresponding to the discharge ports and the number is the same as the number of the material taking ends 211; A first driving member 52, connected to the material receiving member 51, for driving the material receiving member 51 to move at least along the width direction of the conveying member 1.

[0082] The inserts move out of the conveying channel 11 from the discharge port and enter the receiving slots 511. After the inserts enter the receiving slots 511, they can be prevented from being blocked by the wall of the conveying channel 11 during the process of the material taking head 21 driving the inserts vertically. The shape of the receiving slots 511 can refer to the attached drawings. It has two openings, one of which faces the conveying channel 11 and the other faces upward.

[0083] For easy understanding, here an example is given to illustrate a transfer process of the inserts: two discharge ports are provided, and four receiving slots 511 are provided; initially, the two discharge ports are aligned with two of the receiving slots 511; when the two inserts are transferred into these two receiving slots 511, the material receiving member 51 is driven by the first driving member 52 to align the two discharge ports with the other two receiving slots 511; when the other two inserts are transferred into the replaced two receiving slots 511, the material receiving member 51 is continuously driven by the first driving member 52 to make the two discharge ports not aligned with any receiving slots 511; finally, the inserts are taken out, and then the previous process is repeated.

[0084] When directly taking materials from the discharge port with the material taking head 21, it is impossible to restrict the separation of the inserted sheet from the conveying channel 11 during the non-discharge stage, and only the transportation process of the inserted sheet in the conveying channel 11 can be controlled. With the help of the dislocation material receiving mechanism 5, during the process of replacing the inserted sheet in the material receiving groove 511 and the process of taking out the inserted sheet from the material receiving groove 511 with the material taking head 21, the separation of the inserted sheet from the conveying channel 11 can be hindered by the partition part (belonging to the material receiving part 51) between the material receiving grooves 511.

[0085] With the help of the dislocation material receiving mechanism 5, the material taking frequency of the material taking head 21 decreases. Taking ten inserted sheets as an example for illustration, originally the material taking head 21 needed to take materials twice, five inserted sheets each time. Now the material taking head 21 can fix ten inserted sheets at one time, improving the overall transfer progress of the inserted sheets.

[0086] The first driving part 52 can drive the material receiving part 51 at least along the width direction of the conveying part 1, without restricting other driving directions. The first driving part 52 can adopt existing driving devices such as cylinders.

[0087] In this embodiment, the adjacent surfaces of the material receiving part 51 and the conveying part 1 are arranged in parallel, and the distance between the two adjacent surfaces is smaller than the size of the inserted sheet in the length direction of the conveying part 1.

[0088] Taking the material receiving part 51 and the conveying part 1 as two parallel square structures for illustration, at this time, one surface of the material receiving part 51 faces the conveying part 1, and this surface is the adjacent surface described in this embodiment.

[0089] The adjacent surfaces of the material receiving part 51 and the conveying part 1 are arranged in parallel, so that the inserted sheets leaving the conveying channel 11 from any discharge port are arranged in parallel after entering the material receiving part 51, which can facilitate the subsequent transfer process of the inserted sheets.

[0090] When there is a distance between the adjacent surfaces of the material receiving part 51 and the conveying part 1, there is no friction when the two move relatively, which can avoid affecting the relative movement process of the two and avoid wear of the two. The distance between the two adjacent surfaces is smaller than the size of the inserted sheet in the length direction of the conveying part 1, which can prevent the inserted sheet from getting stuck between the two adjacent surfaces or falling to the ground after moving out of the conveying channel 11. Of course, the inserted sheet generally has inertia and can continue to move after moving out of the conveying channel 11. In some embodiments, the distance between the two adjacent surfaces can be set to be equal to or within a certain range greater than the size of the inserted sheet in the length direction of the conveying part 1. The specific reference to the adjacent surfaces in this part is as described in this embodiment. Even if not clearly pointed out, those skilled in the art should also know.

[0091] See Figures 5-7 , in this embodiment, it further includes an inserted sheet mounting mechanism 6, which is arranged on one side of the material taking mechanism 2. The inserted sheet mounting mechanism 6 includes: A support seat 61; A receiving base 62 is fixedly arranged on the support base 61 and has a plurality of receiving grooves 621 for receiving the inserts transferred by the material taking head 21. The number of the receiving grooves 621 is the same as that of the material taking heads 21. There are a plurality of pressing members 63, and the number of the pressing members 63 is the same as that of the receiving grooves 621. Each pressing member 63 includes a pushing head 631, a force value adjusting spring 632 and a force value sensor 633 which are connected in sequence. The pushing head 631 corresponds to the receiving groove 621. A sliding base 64 is connected to each force value sensor 633 and is slidably connected to the support base 61. A second driving member 65 is connected to the support base 61 and the sliding base 64.

[0092] Taking the insert installation mechanism 6 as an example for illustration, the position of the insert installation mechanism 6 can generally be summarized as being on the side of the material taking mechanism 2. The positions of other mechanisms can refer to the description here and the positions in the drawings.

[0093] The receiving grooves 621 are arranged corresponding to the material taking heads 21, and the position distribution thereof can be seen from the position distribution of the material taking heads 21, which should be understood by those skilled in the art even if not explicitly stated.

[0094] It should be noted that the support of the structure is a conventional setting. In this embodiment, the support base 61 is directly pointed out as the support structure. The support base 61 can be a composite structure, that is, the support base 61 itself can include several support structures to respectively support structures such as the receiving base 62 and the second driving member 65, and no specific limitation is made here.

[0095] The second driving member 65 can adopt existing driving devices such as air cylinders and electric sliding tables to achieve the driving purpose, and no specific limitation is made here. The same applies to other driving devices in this application.

[0096] In the insert installation mechanism 6, the driving source is the second driving member 65, but the structure actually contacting the insert is the pushing head 631. Under the indirect action of the second driving member 65, the pushing head 631 pushes the insert transferred into the receiving groove 621 to be assembled with the plastic tube.

[0097] When inserting the insert, the pushing head 631 pushes the insert. In this process, there are problems such as the plastic tube being damaged due to too large a thrust and the insert being inserted too deep, which affects the extraction of the acupuncture needle. Based on this, it is regulated by the force value adjusting spring 632. Under normal circumstances, the force value adjusting spring 632 does not deform. When the resistance received by the insert exceeds the set threshold, the force value adjusting spring 632 deforms so that the insert cannot continue to penetrate into the plastic tube. The force value sensor 633 is used to detect the force condition of the force value adjusting spring 632.

[0098] Each force value adjusting spring 632 is independently regulated, so that the insertion processes of the inserts are independent of each other.

[0099] The force value adjusting spring 632 can be a compression spring or the like, as long as the above requirements are met. The force value sensor 633 is an existing sensor and will not be elaborated here. In some embodiments, the force value sensor 633 can be removed.

[0100] See Figures 5-7 , in this embodiment, the insert mounting mechanism 6 further includes: A moving seat 66, connected to each of the force value sensors 633 and slidably connected to the sliding seat 64; A third driving member 67, connected to the moving seat 66; A collecting member 68, connected to the receiving seat 62, for collecting the inserts that have not been assembled.

[0101] The third driving member 67 can adopt an existing driving device, as long as it meets the requirement of driving the moving seat 66 to move the insert, and no specific limitation is made here.

[0102] In this embodiment, the moving seat 66 is used as an intermediate structure between the force value sensor 633 and the sliding seat 64, so that the force value sensor 633 can move relative to the sliding seat 64. At this time, the sliding seat 64 is connected to each force value sensor 633 through the moving seat 66.

[0103] Considering the difficulty of inserting the insert into the plastic tube, there are cases where some inserts are not inserted into the plastic tube. These inserts will affect the subsequent continuous assembly process of the inserts. Therefore, these inserts need to be transferred to the collecting member 68 in time. This process is set as the insert secondary re-pushing process. During the initial insert pushing process, the third driving member 67 can cooperate with the second driving member 65 for driving.

[0104] During the insert secondary re-pushing process, the third driving member 67 replaces the second driving member 65. The third driving member 67 drives each force value sensor 633 through the moving seat 66, and the subsequent process refers to the above.

[0105] It should be noted that to avoid easily damaging the plastic tube during the process of inserting the insert into the plastic tube, the driving distance of the second driving member 65 is limited. If the second driving member 65 is used to complete the insert secondary re-pushing process, it is difficult to ensure that each unassembled insert enters the collecting member 68. By using the third driving member 67, the driving distance of the third driving member 67 can be flexibly adjusted to ensure that each unassembled insert enters the collecting member 68, thus ensuring the subsequent continuous assembly of the inserts.

[0106] It should also be noted that the insert mounting mechanism 6 can include multiple driving devices such as electric sliding tables to realize the movement of the receiving groove 621 on the x-axis, y-axis and z-axis. In addition, an adsorption device can be provided at the receiving groove 621 to increase the stability of the insert during the non-transfer stage.

[0107] In some embodiments, the collection member 68 is provided as a storage box.

[0108] See Figures 8-9 , in this embodiment, it further includes a material receiving mechanism 7, and the material receiving mechanism 7 includes: A fourth driving member 71; A material taking member 72 (provided as a second material taking member), connected to the fourth driving member 71, including at least two groups of material taking parts 721 distributed along the width direction of the material taking member 72, and each group of material taking parts 721 includes a plurality of material taking parts 721 distributed in parallel along the length direction of the material taking member 72; In the width direction of the material taking member 72, the projection parts of any two of the material taking parts 721 overlap or are separated.

[0109] The fourth driving member 71 is a driving device, and existing single or mixed driving devices such as cylinders and electric sliding tables can be used. The purpose is to transfer these qualified products after the material taking member 72 fixes the qualified products, and it is sufficient to meet this requirement, and no specific limitation is made here. The position of the fourth driving member 71 is not specifically limited here either.

[0110] The method of the material taking part 721 taking materials is not specifically limited here. Electric or pneumatic grippers can be used to implement clamping and taking materials, or existing adsorption devices can be used to implement vacuum adsorption and taking materials.

[0111] Taking the example that the material taking member 72 includes two groups of material taking parts 721: The material taking parts 721 in the two groups of material taking parts 721 are staggeredly distributed in the width direction of the material taking member 72 (the projections can partially overlap), so as to avoid being unable to achieve the predetermined material taking quantity due to the large size of the material taking part 721.

[0112] For further understanding, the following supplementary description is provided: Set a material taking area and there are ten qualified products distributed at intervals along the length direction of the material taking member 72 in the material taking area. If the material taking parts 721 are arranged in parallel along the length direction of the material taking member 72, only five can be placed. The staggered placement method can complete the material taking work of ten qualified products at the same time without expanding the material taking area.

[0113] The material taking member 72 includes at least two groups of material taking parts 721 distributed along the width direction of the material taking member 72, and each group of material taking parts 721 includes a plurality of material taking parts 721 distributed in parallel along the length direction of the material taking member 72. Here, the width direction and the length direction can be interchanged.

[0114] In some embodiments, each material taking part 721 can move along the width direction and the length direction of the material taking member 72. On the one hand, the material taking part 721 can place the qualified products into the following storage member 74, and on the other hand, it can facilitate spreading the qualified products over the storage member 74 and improve the utilization rate of the internal space of the storage member 74.

[0115] See Figures 8-9 , in this embodiment, the material receiving mechanism 7 further includes: A support platform 73 having a support surface inclined downward; Receiving members 74, movably disposed on the support surface, provided in a plurality, and the receiving members 74 are spaced apart along the length direction of the support surface; A limiting member 75, movably disposed on the support platform 73 and corresponding to the receiving members 74.

[0116] In some embodiments, in the width direction of the conveying member 1, the support platform 73 is arranged in parallel with the conveying member 1.

[0117] For the convenience of understanding, an example is given to illustrate the working process of the structure involved in this embodiment: Three receiving members 74 are stably arranged at intervals on the support surface under the action of the limiting member 75. Initially, one of the receiving members 74 is in the receiving area, and the other two receiving members 74 are located above the receiving area. When the receiving member 74 in the receiving area completes the receiving, the limiting member 75 moves downward to release the limitation on each receiving member 74. After each receiving member 74 moves a certain distance, the limiting member 75 resets, so that the subsequent receiving member 74 to take over stays in the receiving area.

[0118] The support surface is inclined downward, so that the receiving members 74 can take over and enter the above-mentioned receiving area under the action of gravity to complete the receiving work of qualified products, reducing manual operation and improving the efficiency of the replacement use of the receiving members 74.

[0119] The setting of the limiting member 75 enables the receiving members 74 to be stably in the receiving area, and in the replacement stage of the receiving members 74, the limiting member 75 enables the receiving members 74 to accurately stay in the receiving area, further reducing manual operation and further improving the efficiency of the replacement use of the receiving members 74.

[0120] In some embodiments, the limiting member 75 includes a cylinder and a plurality of limiting plates. The cylinder drives each limiting plate to move vertically, and each limiting plate passes through the support platform 73 and corresponds to each receiving member 74.

[0121] In some embodiments, the receiving member 74 is provided as a receiving box, and the receiving member 74 is detachably arranged with the support platform 73.

[0122] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. An insert feeding mechanism, characterized in that: Comprising: A conveying member (1), including a plurality of conveying channels (11) arranged along the width direction of the conveying member (1); A picking mechanism (2), including a picking member having a plurality of picking heads (21), and the picking heads (21) are used to fix the inserts conveyed by the conveying channels (11); Wherein, the picking heads (21) are evenly distributed in the width direction of the conveying member (1); The conveying channels (11) all have a feed inlet (111) and a discharge outlet, and the feed inlets (111) and the discharge outlets are respectively evenly spaced along the width direction of the conveying member (1); The distance between two adjacent feed inlets (111) is less than the distance between two adjacent discharge outlets; The picking head (21) has a picking end (211), and in the width direction of the conveying member (1), the size of the picking end (211) is less than or equal to the distance between two adjacent discharge outlets.

2. The inserter loading mechanism according to claim 1, characterized in that: Each of the conveying channels (11) forms a channel group, and the channel group includes a first conveying channel (12), at least one second conveying channel (13) and at least one third conveying channel (14); The length direction of the first conveying channel (12) is parallel to the length direction of the conveying member (1); Each of the second conveying channels (13) forms a first channel group, and each of the third conveying channels (14) forms a second channel group, and the first channel group and the second channel group are symmetrically arranged with the axis of the first conveying channel (12) as the symmetry line; The second conveying channel (13) includes a first section (131) and a second section (132) that are smoothly connected, the length direction of the first section (131) is parallel to the length direction of the conveying member (1), and a part of the second section (132) is an arc section; The end of the second section (132) facing away from the first section (131) extends along the length direction of the conveying member (1).

3. The insert feeding mechanism according to claim 1, characterized in that: It further includes a misaligned material receiving mechanism (5), and the misaligned material receiving mechanism (5) includes: A material receiving member (51), having a plurality of material receiving grooves (511) evenly arranged along the width direction of the conveying member (1), and the material receiving grooves (511) are arranged corresponding to the discharge outlets and the number is the same as the number of the picking ends (211); A first driving member (52), connected to the material receiving member (51), for driving the material receiving member (51) to move at least along the width direction of the conveying member (1).

4. The insert feeding mechanism according to claim 3, characterized in that: The material receiving member (51) is arranged parallel to the adjacent surface of the conveying member (1), and the distance between the two adjacent surfaces is less than the size of the insert in the length direction of the conveying member (1).

5. An insert feeding mechanism according to any one of claims 1-4, characterized in that: It further includes an insert mounting mechanism (6) arranged on one side of the picking mechanism (2), and the insert mounting mechanism (6) includes: A support seat (61); A receiving seat (62), fixedly arranged on the support seat (61), having a plurality of receiving grooves (621), and the receiving grooves (621) are used to receive the inserts transferred by the picking heads (21), and the number of the receiving grooves (621) is the same as the number of the picking heads (21); The press-in parts (63) are provided in a plurality and the number thereof is the same as that of the receiving grooves (621), and each press-in part (63) includes a push head (631), a force value adjusting spring (632) and a force value sensor (633) which are sequentially connected. The push head (631) corresponds to the receiving groove (621). The sliding seat (64) is connected to each of the force value sensors (633) and is slidably connected to the support seat (61). The second driving member (65) is connected to the support seat (61) and the sliding seat (64).

6. The pick-up mechanism for inserts according to claim 5, wherein: The insert mounting mechanism (6) further includes: A moving seat (66); A third driving member (67) connected to the moving seat (66); A collecting member (68) connected to the receiving seat (62) for collecting the inserts that have not been assembled. Wherein, the sliding seat (64) is connected to each of the force value sensors (633) through the moving seat (66), and the moving seat (66) is slidably disposed on the sliding seat (64).

7. An insert feeding mechanism according to any one of claims 1-4, characterized in that: A material receiving mechanism (7) is further provided on one side of the material taking mechanism (2), and the material receiving mechanism (7) includes: A fourth driving member (71); A material taking member (72) connected to the fourth driving member (71), and the material taking member (72) includes at least two sets of material taking parts (721) distributed along the width direction of the material taking member (72). Each set of material taking parts (721) includes a plurality of material taking parts (721) distributed in parallel along the length direction of the material taking member (72). In the width direction of the material taking member (72), the projection parts of any two of the material taking parts (721) overlap or are separated from each other.

8. The pick-up mechanism for inserts according to claim 7, wherein: The material receiving mechanism (7) further includes: A support table (73) having a support surface inclined downward; Receiving members (74) movably disposed on the support surface, and a plurality of the receiving members (74) are provided and are spaced apart along the length direction of the support surface; A limiting member (75) movably disposed on the support table (73) and corresponding to the receiving members (74).

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