Anti-drawing testing device for needle head of hydro-optical needle

Abstract

The utility model provides a hydro-smooth needle head anti-drawing test device, which comprises a rack, a hook unit and a drawing unit, the rack comprises a top plate, a bottom plate and a connecting column group, the top plate is provided with a clamping groove penetrating through the top plate in the height direction of the rack, and the clamping groove extends from the side surface of the top plate to the middle part of the top plate along a first direction; the connecting column group is connected between the top plate and the bottom plate, the hook unit comprises a plurality of hook modules, each hook module comprises a connecting piece and a first hook piece, the first hook piece is installed on the connecting piece, the drawing unit comprises a weight and a second hook piece, the second hook piece is installed on the weight, and the second hook piece can be hooked on the first hook piece. The anti-drawing test device for the hydro-optical needle head has the advantages that the operation is simple, the hydro-optical needle head is not easy to damage, the test efficiency is favorably improved, the reliability is high, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, and specifically, to a tensile test device for a water-light injection needle head. Background Art

[0002] During the production process of a water-light injection needle head, it is necessary to apply glue to the connection between the nine needle tubes and the needle base of the water-light injection needle head. After the glue is cured, a tensile test needs to be carried out on the needle tubes. As Figure 1 and Figure 2 shown, the existing tensile test on the needle tube 931 is usually carried out by a tensile test device. The tensile test device includes a driving mechanism, a chuck 91 and a fixture 92. During the test, the water-light injection needle head 93 is installed on the fixture 92; then, the driving mechanism is used to drive the chuck 91 to move to the position of the needle tube 931 of the water-light injection needle head 93, and then the chuck 91 is adjusted to clamp the needle tube 931. Finally, the driving mechanism is used to drive the chuck 91 to move away from the water-light injection needle head 93 to apply a certain tensile force to the needle tube 931. If the needle tube 931 does not detach from the needle head after a continuous set time, it proves that the adhesion force of the needle tube 931 is qualified, and then the above operation is repeated. When all nine needle tubes 931 of the water-light injection needle head 93 pass the test, the water-light injection needle head 93 meets the requirements of a qualified product. However, if the needle tube 931 detaches from the needle base 932 during the test, the water-light injection needle head 93 is an unqualified product. However, the existing tensile test device has the following deficiencies:

[0003] First, the operation of clamping the water-light injection needle head 93 by the fixture 92 is troublesome;

[0004] Second, when the chuck 91 is too large, it is easy to cause deformation of other needle tubes 931 during the process of loosening the clamping of the needle tube 931;

[0005] Third, it is not conducive to improving the efficiency of the tensile test on the water-light injection needle head 93;

[0006] Fourth, the tensile test device involves an electrical structure, resulting in poor reliability and high cost. Summary of the Invention

[0007] In order to solve the above problems, the main purpose of the utility model is to provide a tensile test device for a water-light injection needle head, which is simple to operate, not easy to damage the water-light injection needle head, conducive to improving the test efficiency, has strong reliability and low cost.

[0008] To achieve the main object of the present utility model, the present utility model provides a tensile pull-out test device for a hydrodermabrasion needle head, which includes a frame, a hook unit and a pull-out unit. The frame includes a top plate, a bottom plate and a connecting column group. The top plate is provided with a card slot that penetrates itself in the height direction of the frame. The card slot extends from the side surface of the top plate to the middle of the top plate along a first direction. The connecting column group is connected between the top plate and the bottom plate. The hook unit includes a plurality of hook modules. Each hook module includes a connecting member and a first hook member. The first hook member is installed on the connecting member. The pull-out unit includes a weight and a second hook member. The second hook member is installed on the weight, and the second hook member can be hooked on the first hook member.

[0009] As can be seen from the above, when performing a tensile pull-out test on a hydrodermabrasion needle head, a hook module is installed on the needle tube of the hydrodermabrasion needle head, and the hook module and the needle tube are fixedly connected through a connecting member; the hydrodermabrasion needle head is slid into the card slot so that the hydrodermabrasion needle head is supported and fixed, thus making the clamping and fixing of the hydrodermabrasion needle head more convenient and conducive to improving the test efficiency; the pull-out unit is suspended on the first hook member through the second hook member, and then a constant pulling force is applied to the needle tube through the hook module. When each needle tube can withstand the pulling force applied by the pull-out unit for a preset time, it proves that the hydrodermabrasion needle head meets the product requirements. When a needle tube is separated from the needle seat under the pulling force applied by the pull-out unit within the preset time, it proves that the hydrodermabrasion needle head does not meet the product requirements.

[0010] A preferred solution is that the inner wall of the card slot is stepped; the frame further includes a pressing plate. The pressing plate has an avoidance slot that penetrates itself in the height direction. The avoidance slot extends from the side surface of the pressing plate to the inside of the pressing plate along the first direction. The pressing plate is installed on the top of the top plate and is located at the extending end of the card slot. The pressing plate covers the card slot. The avoidance slot is located above the card slot, and the opening of the avoidance slot faces the same direction as the opening of the card slot. A first clamping position is formed between the pressing plate and the card slot.

[0011] As can be seen from the above, this design enables the pressing plate to cooperate with the top plate to provide more reliable support and fixation for the hydrodermabrasion needle head, so as to better prevent the hydrodermabrasion needle head from tilting during the tensile pull-out test, thereby ensuring the accuracy of the test and preventing the needle tube from being deformed and damaged.

[0012] A further solution is that a guiding surface is formed at the opening of the card slot.

[0013] As can be seen from the above, the guiding surface is used to guide the hydrodermabrasion needle head to slide into the card slot better.

[0014] A further improved solution is that the tensile pull-out test device for a hydrodermabrasion needle head further includes a first stock preparation seat. The first stock preparation seat is installed on the top of the top plate, and the first stock preparation seat is provided with a second clamping position.

[0015] As can be seen from the above, by setting up the first material preparation seat, when the hyaluronic acid needle pull-out resistance test device performs a pull-out resistance test on the hyaluronic acid needle, the hook module of another hyaluronic acid needle can be installed through the first material preparation seat, thereby further improving the test efficiency.

[0016] A further solution is that the hyaluronic acid needle pull-out resistance testing device also includes a second material preparation seat, which is installed on the top of the top plate and arranged side by side with the first material preparation seat, and a latch is provided on the second material preparation seat.

[0017] As can be seen from the above, since the time the pulling unit applies force to the needle tube is usually longer than the installation time of the hook module, by further setting up a second preparation seat, it is possible to install the hook module on another hyaluronic acid needle head to further improve the test efficiency; in addition, by setting the relative positions of the first preparation seat and the second preparation seat, the number of times the operator moves is reduced when installing the hook module on different hyaluronic acid needle heads, which is conducive to better improving the test efficiency, and through the structural design of the first preparation seat and the second preparation seat, the operator's hand can be prevented from being pierced by the needle tube when the hook module is installed.

[0018] Another preferred solution is that the connecting member includes a connecting rod and a rotating sleeve, the first end of the connecting rod is provided with a plurality of claws, the plurality of claws are distributed along the circumference of the connecting rod, the rotating sleeve is provided on the connecting rod and is threadedly connected to the connecting rod, the rotating sleeve can drive the plurality of claws to move toward or away from each other, and the first hanging member is connected to the second end of the connecting member.

[0019] As can be seen from the above, through the design of the connecting piece, the hook module can be reliably fixed on the needle tube, and the disassembly and assembly between the hook module and the needle tube is more convenient.

[0020] A further solution is that the water light needle needle pull-out resistance testing device also includes a tray, and the tray is placed between the top plate and the bottom plate.

[0021] As can be seen from the above, this design enables the tray to receive the detached pulling unit, hook module, needle tube and other components when the needle tube cannot withstand the pulling force of the pulling unit and detaches from the needle seat, so as to better prevent the pulling unit from falling to the ground and causing personal injury.

[0022] A further solution is that the tray is slidably connected to the connecting column group in the height direction.

[0023] As can be seen from the above, this design enables the connecting column group to limit the pallet to prevent the pallet from falling to the ground together with the pulling unit under the action of the pulling unit.

[0024] A further solution is that the tensile pull-out test device for the water-light injection needle head further includes a pressure sensor, an alarm, and a control unit. The pressure sensor is installed on the bottom plate and adjacent to the tray. The alarm can emit sound and / or light alarms. The control unit is electrically connected to the pressure sensor and the alarm respectively.

[0025] As can be seen from the above, this design enables when the syringe tube cannot withstand the tensile force of the pull-out unit and detaches from the needle seat, after the pull-out unit drops onto the tray, the tray will exert an external force on the pressure sensor, and the pressure sensor will send a feedback signal to the control unit, causing the control unit to control the alarm to emit sound and / or light alarms to more intuitively remind the user.

[0026] A further solution is that the tray has a receiving groove; when the tensile pull-out test device for the water-light injection needle head is in the test state, a part of the pull-out unit is located in the receiving groove.

[0027] As can be seen from the above, this design enables when the syringe tube cannot withstand the tensile force of the pull-out unit and detaches from the needle seat, the pull-out unit can be better caught by the tray, improving the safety of using the tensile pull-out test device for the water-light injection needle head. Description of the Drawings

[0028] Figure 1 is the first partial structure diagram of the existing tensile pull-out test device.

[0029] Figure 2 is the second partial structure diagram of the existing tensile pull-out test device.

[0030] Figure 3 is the structure diagram of the embodiment of the tensile pull-out test device for the water-light injection needle head of the present utility model.

[0031] Figure 4 is the structure diagram of the embodiment of the tensile pull-out test device for the water-light injection needle head of the present utility model with some components omitted.

[0032] Figure 5 is the structure diagram of the hook module of the embodiment of the tensile pull-out test device for the water-light injection needle head of the present utility model.

[0033] Figure 6 is the structure diagram of the first stock preparation seat of the embodiment of the tensile pull-out test device for the water-light injection needle head of the present utility model.

[0034] Figure 7 is the structure diagram of the second stock preparation seat of the embodiment of the tensile pull-out test device for the water-light injection needle head of the present utility model.

[0035] Figure 8 is the cross-sectional view of the embodiment of the tensile pull-out test device for the water-light injection needle head of the present utility model with some components omitted.

[0036] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. Specific embodiments

[0037] Referring to Figure 3 , the tensile pull-out test device 100 for the water-light injection needle head includes a frame 1, a hook unit, a pull-out unit 3, a first stock preparation seat 4, a second stock preparation seat 5 and a tray 6.

[0038] Combined with Figure 4 , the frame 1 includes a top plate 11, a bottom plate 12, a connecting column group 13 and a pressing plate 14. The top plate 11 is provided with a card slot 111, the card slot 111 penetrates the top plate 11 in the height direction of the frame 1, and the card slot 111 extends from the side surface of the top plate 11 to the middle of the top plate 11 along a first direction; wherein, the first direction is perpendicular to the height direction of the frame 1. Preferably, the inner wall of the card slot 111 is stepped.

[0039] The connecting column group 13 includes a plurality of connecting columns, the plurality of connecting columns extend in the height direction of the frame 1, the first end of the connecting column is connected to the top plate 11, and the second end of the connecting column is connected to the bottom plate 12, so that an operable space is formed inside the frame 1, and at the same time, the weight of the frame 1 can be reduced, and the production cost of the frame 1 can be reduced.

[0040] The pressing plate 14 is installed on the top of the top plate 11, and the pressing plate 14 is located at the extension end of the card slot 111 and covers the card slot 111, so that a first clamping position 140 is formed between the pressing plate 14 and the card slot 111. The pressing plate 14 is provided with an avoidance groove 141, the avoidance groove 141 penetrates the pressing plate 14 in the height direction of the frame 1, and the avoidance groove 141 extends from the side surface of the pressing plate 14 to the inside of the pressing plate 14 along the first direction; wherein, the opening of the avoidance groove 141 of the pressing plate 14 faces the same direction as the opening of the card slot 111 of the top plate 11.

[0041] When it is necessary to perform a tensile pull-out test on the water-light injection needle head 10, first, the needle seat 102 of the water-light injection needle is slid into the card slot 111, and the convex part 1021 on the needle seat 102 is moved into the first clamping position 140. The needle tube 101 on the needle seat 102 passes through the card slot 111 and is located below the top plate 11, and the connecting part 1022 of the needle seat 102 passes through the card slot 111 and the avoidance groove 141 and is located above the pressing plate 14. In this way, there is no need to additionally set up a special fixture to clamp and fix the needle seat 102, making the disassembly and assembly of the water-light injection needle head 10 and the frame 1 more convenient. In addition, the combined design of the top plate 11 and the pressing plate 14 can reliably support and fix the water-light injection needle head 10 to prevent the water-light injection needle head 10 from tilting during the tensile pull-out test, thereby ensuring the accuracy of the test and preventing the needle tube 101 from being deformed and damaged. Preferably, a guiding surface 1111 is formed at the opening of the card slot 111, so that the water-light injection needle head 10 can be more conveniently slid into the card slot 111 under the guidance of the guiding surface 1111.

[0042] Combination Figure 5 , the hook unit includes a plurality of hook modules 21, and the hook modules 21 are used for fixedly connecting with the syringe tube 101 of the hydrodermabrasion needle head 10. The hook module 21 includes a connecting member 211 and a first hook member 212. The connecting member 211 preferably includes a connecting rod 2111 and a rotating sleeve 2112. A plurality of clamping jaws 21111 are provided at the first end of the connecting rod 2111. The clamping jaws 21111 can be elastically deformed so that the plurality of clamping jaws 21111 can move closer to each other to clamp the syringe tube 101 or move away from each other to loosen the clamping of the syringe tube 101. External threads are also provided on the outer peripheral surface of the connecting rod 2111; one end of the rotating sleeve 2112 is conical, and this conical part is used for cooperating with the plurality of clamping jaws 21111 to connect, so that the rotating sleeve 2112 can drive the plurality of clamping jaws 21111 to move towards or away from each other. Internal threads are provided in the rotating sleeve 2112. The rotating sleeve 2112 is sleeved on the connecting rod 2111, and the rotating sleeve 2112 is threadedly connected with the external threads of the connecting rod 2111 through the internal threads. The first hook member 212 is connected to the second end of the connecting rod 2111. Preferably, a stud is provided at the end of the first hook member 212, and a threaded hole is provided at the second end of the connecting rod 2111. The first hook member 212 is threadedly connected with the threaded hole of the connecting rod 2111 through the stud. Through the design of the connecting member 211, the hook module 21 can be reliably fixed on the syringe tube 101, and the disassembly and assembly between the hook module 21 and the syringe tube 101 are made more convenient.

[0043] The pulling unit 3 includes a weight 31 and a second hook member 32, the second hook member 32 is installed on the weight 31, and the second hook member 32 is used to hook and connect with the first hook member 212. When the pull-out test is performed on the hyaluronic acid needle head 10, the hook module 21 is installed on the needle tube 101 of the hyaluronic acid needle head 10 through the connecting member 211. Then, the hyaluronic acid needle head 10 is slid into the card slot 111 and engaged in the first card position 140, so that the hyaluronic acid needle head 10 is supported and fixed; wherein, when the hyaluronic acid needle head 10 is installed in the first card position 140, a hook module 21 is installed on each needle tube 101 of the hyaluronic acid needle head 10 at the same time; of course, the hook module 21 can also be installed on only one needle tube 101 of the hyaluronic acid needle head 10, and after completing the pull-out test of the needle tube 101, the hook module 21 is installed on the next needle tube 101. Next, the pulling unit 3 is hung one by one on the first hook member 212 of the hook module 21 through the second hook member 32, and then a constant pulling force is applied to the needle tube 101 through the hook module 21; when each needle tube 101 can withstand the pulling force applied by the pulling unit 3 for a preset time without being separated from the needle seat 102, it means that the bonding force between the needle tube 101 and the needle seat 102 is qualified, and therefore the hyaluronic acid needle head 10 meets the product requirements; when a needle tube 101 is separated from the needle seat 102 within the preset time due to the pulling force applied by the pulling unit 3, it means that the bonding force between the needle tube 101 and the needle seat 102 is unqualified, and therefore the hyaluronic acid needle head 10 does not meet the product requirements.

[0044] Combination Figure 6 , the first material preparation seat 4 is installed on the top of the top plate 11, and the first material preparation seat 4 is provided with a second clamping position 41, and the second clamping position 41 penetrates the first material preparation seat 4 in the thickness direction of the first material preparation seat 4, and the opening of the first clamping position 140 is located at the top of the first material preparation seat 4. When the hyaluronic acid needle head 10 is assembled with the first material preparation seat 4, the needle seat 102 of the hyaluronic acid needle head 10 and the protrusion 1021 thereon are engaged in the first clamping position 140, and the hyaluronic acid needle head 10 passes through the first material preparation seat 4. The setting of the first material preparation seat 4 enables the installation of the hook module 21 on another hyaluronic acid needle head 10 through the first material preparation seat 4 when the hyaluronic acid needle head pull-out test device 100 performs a pull-out test on the hyaluronic acid needle head 10, thereby further improving the test efficiency. Preferably, the thickness direction is perpendicular to the first direction and the height direction of the frame 1, respectively, so as to avoid interference with the pull-out resistance test of the hyaluronic acid needle 10 located in the first clamping position 140 when the hook module 21 is installed on the needle tube 101 of the hyaluronic acid needle 10 on the first preparation seat 4.

[0045] Combination Figure 7The second material preparation seat 5 is installed on the top of the top plate 11, and the second material preparation seat 5 and the first material preparation seat 4 are preferably arranged side by side in the first direction. A latch 51 is provided on the second material preparation seat 5, and the latch 51 is parallel to the thickness direction of the first material preparation seat 4. The latch 51 is used for the flow channel on the connecting part 1022 of the needle seat 102 to fix the water light needle 10 on the second material preparation seat 5. Since the time duration of the force applied by the pulling unit 3 to the needle tube 101 is usually longer than the installation time duration of the hook module 21, by further setting up a second preparation seat 5, it is possible to install the hook module 21 on another hyaluronic acid needle head 10, so as to further improve the test efficiency; in addition, by setting the relative positions of the first preparation seat 4 and the second preparation seat 5, the number of movements of the operator is reduced when installing the hook module 21 on different hyaluronic acid needle heads 10, which is beneficial to better improve the test efficiency; furthermore, by designing the structures of the first preparation seat 4 and the second preparation seat 5, when the hyaluronic acid needle head 10 installed on the first preparation seat 4 and the hyaluronic acid needle head 10 installed on the second preparation seat 5 are staggered with each other, and then when the hook module 21 is installed on the hyaluronic acid needle head 10 on the first preparation seat 4 and / or the second preparation seat 5, the needle tube 101 of the hyaluronic acid needle head 10 will injure the operator's hand.

[0046] The tray 6 is placed between the top plate 11 and the bottom plate 12, so that when the needle tube 101 cannot withstand the pulling force of the pulling unit 3 and is separated from the needle seat 102, the tray 6 can receive the detached pulling unit 3, the hook module 21, the needle tube 101 and other components, so as to better prevent the pulling unit 3 from falling to the ground and causing personal injury. Preferably, the tray 6 is slidably connected to the connecting column group 13 in the height direction, so that the connecting column group 13 can limit the tray 6 to prevent the tray 6 from falling to the ground together with the pulling unit 3 under the action of the pulling unit 3. Among them, the tray 6 has a receiving groove 61, and preferably, when the water light needle needle anti-pulling test device 100 is in the test state, a part of the pulling unit 3 is located in the receiving groove 61, so that when the needle tube 101 cannot withstand the pulling force of the pulling unit 3 and is separated from the needle seat 102, the pulling unit 3 can be better received by the tray 6, thereby improving the safety of the use of the water light needle needle anti-pulling test device 100.

[0047] Furthermore, combined with Figure 8, the tensile pull - out test device 100 for the water - light injection needle head further includes a pressure sensor 7, an alarm, and a control unit. The pressure sensor 7 is installed on the bottom plate 12 and is adjacent to the tray 6. The alarm can emit sound and / or light alarms. The control unit is electrically connected to the pressure sensor 7 and the alarm respectively. This design enables that when the syringe barrel 101 cannot withstand the pulling force of the pulling unit 3 and detaches from the needle base 102, after the pulling unit 3 drops onto the tray 6, the tray 6 will exert an external force on the pressure sensor 7, and the pressure sensor 7 will send a feedback signal to the control unit, causing the control unit to control the alarm to emit sound and / or light alarms to more intuitively remind the user.

[0048] In summary, through the tensile pull - out test device 100 for the water - light injection needle head, the disassembly and assembly of the water - light injection needle head 10 are made more convenient and fast. Moreover, with the cooperation between the hook unit and the pulling unit 3, when performing the tensile pull - out test on the syringe barrel 101 of the water - light injection needle head 10, the syringe barrel 101 will not be deformed, which plays a protective role for the syringe barrel 101. In addition, since the hook module 21 of the hook unit is fixed to the syringe barrel 101 without the need to rely on other electric drive mechanisms, the cost of the tensile pull - out test device 100 for the water - light injection needle head can be effectively reduced, and the reliability of the tensile pull - out test device 100 for the water - light injection needle head can be ensured. Furthermore, with the assistance of the first stockpiling seat 4 and the second stockpiling seat 5, the tensile pull - out test device 100 for the water - light injection needle head can further improve the test efficiency.

[0049] Finally, it should be emphasized that the above - mentioned are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A device for testing the pull-out resistance of a water light needle, characterized in that: include: A frame, the frame comprising a top plate, a bottom plate and a connecting column group, the top plate is provided with a slot penetrating the frame in a height direction, the slot extends from a side surface of the top plate along a first direction toward a middle portion of the top plate, and the connecting column group is connected between the top plate and the bottom plate; A hook unit, wherein the hook unit comprises a plurality of hook modules, wherein the hook module comprises a connecting member and a first hook member, and the first hook member is mounted on the connecting member; The pulling unit comprises a weight and a second hook member, wherein the second hook member is mounted on the weight, and the second hook member can be hooked on the first hook member.

2. The pull-out resistance test device for the hyaluronic acid needle according to claim 1 is characterized in that: The inner wall of the card slot is in a step shape; The frame also includes a pressure plate, which has an avoidance groove that penetrates the pressure plate in the height direction, and the avoidance groove extends from the side of the pressure plate into the pressure plate along the first direction. The pressure plate is installed on the top of the top plate and is located at the extended end of the card slot. The pressure plate covers the card slot, and the avoidance groove is located above the card slot. The opening of the avoidance groove is in the same direction as the opening of the card slot, and a first card position is formed between the pressure plate and the card slot.

3. The pull-out resistance test device for the hyaluronic acid needle according to claim 2 is characterized in that: A guide surface is formed at the opening of the slot.

4. The pull-out resistance test device for the hyaluronic acid needle according to claim 2, characterized in that: The water light needle needle pull-out resistance testing device also includes a first material preparation seat, which is installed on the top of the top plate and has a second clamping position.

5. The pull-out resistance testing device for the hyaluronic acid needle according to claim 4 is characterized in that: The pull-out resistance testing device for the needle tip of the water light needle also includes a second material preparation seat, which is installed on the top of the top plate and arranged side by side with the first material preparation seat, and a latch is provided on the second material preparation seat.

6. The pull-out resistance test device for the hyaluronic acid needle according to claim 1, characterized in that: The connecting member includes a connecting rod and a rotating sleeve. The first end of the connecting rod is provided with a plurality of clamping jaws, and the plurality of clamping jaws are distributed along the circumference of the connecting rod. The rotating sleeve is sleeved on the connecting rod and threadedly connected to the connecting rod. The rotating sleeve can drive the plurality of clamping jaws to move toward or away from each other. The first hook member is connected to the second end of the connecting member.

7. The device for testing the anti-pulling of the hyaluronic acid needle according to any one of claims 1 to 6, characterized in that: The water light needle anti-pull-out testing device also includes a tray, and the tray is placed between the top plate and the bottom plate.

8. The pull-out resistance testing device for the hyaluronic acid needle according to claim 7, characterized in that: The tray is slidably connected to the connecting column group in the height direction.

9. The device for testing the anti-pulling of the hyaluronic acid needle tip according to claim 8, characterized in that: The water light needle anti-pull-out test device also includes: a pressure sensor mounted on the base plate and adjacent to the tray; An alarm that can emit an audible and / or visual alarm; A control unit is electrically connected to the pressure sensor and the alarm respectively.

10. The pull-out resistance testing device for the hyaluronic acid needle according to claim 7, characterized in that: The tray has a receiving groove, and when the water light needle anti-pull-out testing device is in a testing state, a part of the pulling unit is located in the receiving groove.

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