CN112474420B - Full-automatic heparin tube letter sorting system - Google Patents

Abstract

The invention discloses a full-automatic blood collection tube sorting system, which comprises: and the conveying mechanism is used for conveying the labeled blood collection tubes. And the scanning mechanism is used for scanning the blood sampling tubes conveyed by the conveying mechanism, determining information on the label and facilitating rear-end sorting. And the sorting mechanism is used for sorting the blood sampling tubes scanned in the scanning mechanism. And the blanking mechanism is used for collecting the blood sampling tubes sorted by the sorting mechanism. And the bottom plate is used for supporting the conveying mechanism, the scanning mechanism, the sorting mechanism and the blanking mechanism. And a controller. This full-automatic heparin tube letter sorting system simple structure scans the information on the heparin tube through scanning mechanism, then rethread letter sorting mechanism sorts, then rethread blanking mechanism collects. Sorting that can be quick to can not cause the heparin tube breakage when collecting the heparin tube, have the buffering to the heparin tube, make it slowly roll down. The detection efficiency and the collection quality of the blood collection tube are ensured.

Description

A fully automatic blood collection tube sorting system

technical field

The invention relates to the technical field of blood collection tube sorting, in particular to an automatic blood collection tube sorting system.

Background technique

At present, after the hospital uses the vacuum blood collection tube to collect the patient's blood or body fluid samples, the patient's information is input into the computer, and then the information is made into a label. The label with the patient information needs to be affixed to the corresponding vacuum blood collection tube as a mark. . After the collection work such as blood collection is completed, according to different inspection items, these blood collection tubes need to be classified according to the inspection items and sent to different testing rooms/inspection equipment for inspection.

In the existing vacuum blood collection tube sorting process, it is usually done by manual sorting. The manual sorting operation method is prone to sorting errors, damaged blood collection tubes, and low sorting efficiency. However, the structure of the existing sorter is complex, and the sorted blood collection tubes are easily broken when collected.

Chinese invention patent 201710909667.7 discloses a blood collection tube sorting device;

Chinese invention patent 201810201041.5 discloses a method for intelligent sorting of blood collection tubes and an intelligent sorting machine for blood collection tubes;

Chinese invention patent 201810335945.7 discloses an automatic sorting instrument for blood collection tubes.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned defects in the prior art, the present invention proposes an automatic blood collection tube sorting system.

The technical scheme of the present invention is realized as follows:

An automatic blood collection tube sorting system, characterized in that it includes:

a delivery mechanism for delivering the labelled blood collection tubes;

The conveying mechanism has a conveying motor, a fixing plate and a conveying belt, the fixing plate is on both sides of the conveying belt, the conveying belt is installed on the fixing plate through the first conveying roller, and the conveying motor is installed on the fixing plate and connected with the first conveying roller, the fixing plate also has a fixing groove, the fixing groove has a blocking piece, the blocking piece has a mounting part and an arc guide part, the mounting part is placed in the fixing groove, the arc guide portion extends to the middle upper end of the conveyor belt;

A scanning mechanism, which is used to scan the blood collection tubes conveyed from the conveying mechanism to determine the information on the label, which is convenient for back-end sorting;

The scanning mechanism has a cover, a first support base, a second support base and a first motor, the cover is installed on the first support base and the second support base, and the first support base and the second support base are arranged between the first support base and the second support base. There is a conveyor belt between the two sides of the conveyor belt, there are second conveyor rollers on both sides of the middle of the conveyor belt, and there is a rotating shaft in the middle of the second conveyor roller. The rotating shaft is connected, the inside of the outer cover also has a scanner, the scanner is on the upper end of the conveyor belt, and the scanner has a first infrared sensor;

a sorting mechanism for sorting the blood collection tubes scanned in the scanning mechanism;

The sorting mechanism has a belt, a third motor and a support plate, the support plate has a rotating roller, the rotating roller is connected with the third motor, the third motor is installed on the support plate, and the rotating roller is Bearings are provided at both ends, a fixing piece is arranged on the bearing, a positioning portion is arranged on the fixing piece, a plurality of transmission pieces are arranged on the positioning portion, a hinge portion is arranged at the lower end of the transmission piece, and a fixing block is arranged on the belt , the fixing block has a rotating shaft, the hinge part is mounted on the rotating shaft, the fixing part has a plurality of second notches, and the fixing part also has a second infrared sensor, the second infrared sensor is in the first Two-notch front end;

A blanking mechanism for collecting blood collection tubes sorted by the sorting mechanism;

The blanking mechanism has a collection box, and the collection box is installed at the second gap;

a bottom plate for supporting the conveying mechanism, scanning mechanism, sorting mechanism and blanking mechanism; and

A controller is used to control the conveying mechanism, the scanning mechanism, the sorting mechanism and the blanking mechanism, and display information.

In the automatic blood collection tube sorting system of the present invention, the outer surface of the conveyor belt has anti-slip stripes.

In the automatic blood collection tube sorting system of the present invention, the cover has a second motor, the second motor has a first gear, the inside of the cover has a screw rod, and the cover has a communication The screw rod is installed in the through hole, the screw rod includes a first threaded part, a second threaded part, a second gear and a sliding part, the sliding parts are located at both ends of the screw rod, the second The gear is in the middle of the screw rod, the first threaded part and the second threaded part are at both ends of the second gear, and are respectively connected with the sliding part, the sliding part is placed in the through hole, the first threaded part and the The threads on the second threaded portion are in opposite directions.

In the automatic blood collection tube sorting system of the present invention, the screw rod is provided with a clamping member, the clamping member is respectively installed on the first threaded portion and the second threaded portion, and the clamping member has A moving part and a clamping part, the moving part is mounted on the screw rod, the clamping part has a limiting part and a first notch, the limiting part is at both ends of the first notch, and the limiting part There is a roller groove and a positioning groove in the middle of the roller groove, the roller groove has a roller, the positioning groove has a positioning block, the roller is installed on the positioning block, and the positioning block has a positioning rod. A first spring is sleeved, a mounting plate is provided at the slot of the roller groove and the positioning groove, the mounting plate is mounted on the clamping piece by screws, the mounting plate has a positioning hole, and the positioning rod is placed in the positioning In the hole, one end of the first spring is in contact with the positioning block, and the other end is in contact with the mounting plate.

In the automatic blood collection tube sorting system of the present invention, the outer cover is further provided with a first cylinder, and the first cylinder is provided with a baffle plate, and the baffle plate is installed at the rear end of the outer cover.

In the automatic blood collection tube sorting system of the present invention, the lower end of the second gap has a top plate, the lower end of the top plate has a connecting rod, and the lower end of the connecting rod has a third air cylinder, and the third air cylinder is installed in the on the bottom plate.

In the automatic blood collection tube sorting system of the present invention, the lower end of the collection box has a connecting plate, the connecting plate has a rotating motor, the rotating motor has a motor rod, and the motor rod has three There are some gears at the place, the tooth angle of the partial gears is 120°, the angle between the three partial gears is 120°, the inner wall of the collection box has a limit groove, and the limit groove has a buffer. Plate, the lower end of the buffer plate has a rack, the rack is meshed with part of the gear, the two sides of the buffer plate have limit rod holes, the lower end of the limit slot has a support block, the support block There is a limit rod on it, the limit rod is placed in the limit rod hole, the outer part of the limit rod is sleeved with a second spring, one end of the second spring is in contact with the support block, and the other end is in contact with the buffer board contact.

The automatic blood collection tube sorting system implemented in the present invention has the following beneficial effects: the fully automatic blood collection tube sorting system has a simple structure, scans the information on the blood collection tubes by the scanning mechanism, and then sorts by the sorting mechanism, Then it is collected by the blanking mechanism. It can be sorted quickly, and the blood collection tube will not be broken when collecting the blood collection tube, and it has a buffer for the blood collection tube to slowly roll down. The detection efficiency and collection quality of blood collection tubes are guaranteed.

Description of drawings

1 is a schematic structural diagram of an automatic blood collection tube sorting system of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the sectional view at A-A place in Fig. 2;

Fig. 4 is the partial structural schematic diagram of the conveying mechanism in Fig. 1;

FIG. 5 is a schematic structural diagram of the stopper in FIG. 4;

6 is a schematic structural diagram of the scanning mechanism in FIG. 1;

Fig. 7 is the internal structure schematic diagram of Fig. 6;

Fig. 8 is the top view of Fig. 7;

Fig. 9 is a sectional view at B-B in Fig. 8;

Fig. 10 is an exploded view of the clamping member structure in Fig. 7;

FIG. 11 is a schematic view of the structure in another direction of FIG. 10;

Figure 12 is a schematic structural diagram of the sorting mechanism and a schematic structural diagram of the blanking mechanism in Figure 1;

Fig. 13 is a schematic diagram of the partial structure of the sorting mechanism in Fig. 12;

FIG. 14 is a schematic structural diagram of the transmission member in FIG. 13;

Figure 15 is a schematic structural diagram of the blanking mechanism in Figure 12;

FIG. 16 is a schematic view of the structure in another direction of FIG. 15;

Fig. 17 is the exploded view of Fig. 16;

Fig. 18 is a partial structural schematic diagram in Fig. 17;

FIG. 19 is a partial enlarged view of C in FIG. 18 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in Figures 1 to 19, the automatic blood collection tube sorting system of the present invention is shown. Because the hospital needs to identify the blood collection tube 5 containing the specimen and select the corresponding blood collection tube 5 before collecting any test specimens, and also need to paste the department, bed number, name, gender, hospitalization outside the blood collection tube 5 5 labels of blood collection tubes with information such as number, inspection item, inspection purpose, and date of delivery for inspection. These information are input into the computer, and then the information is made into a label, which is attached to the blood collection tube 5 for sorting.

include:

The delivery mechanism 1 is used to deliver the labeled blood collection tube 5 .

The conveying mechanism 1 has a conveying motor (not shown in the figure), a fixing plate 6 and a conveying belt 7, the fixing plate 6 is on both sides of the conveying belt 7, and the conveying belt 7 is installed on the fixing plate 6 through the first conveying roller 8, The conveying motor is mounted on the fixing plate 6 and connected to the first conveying roller 8 . The fixing plate 6 also has a fixing groove 9, the fixing groove 9 has a stopper 10, the stopper 10 has a mounting part 11 and an arc guide part 12, the mounting part 11 is placed in the fixing groove 9, and the arc guide part 12 extends to The upper middle end of the conveyor belt 7 .

Through the rotation of the conveying motor, the blood collection tube 5 is carried on the conveyor belt 7, and when it reaches the stopper 10, it is guided by the arc guide portion 12, so that the blood collection tube 5 is straightened.

The scanning mechanism 2 is used to scan the blood collection tube 5 conveyed from the conveying mechanism 1 to determine the information on the label, which is convenient for rear-end sorting.

The scanning mechanism 2 has a cover 13 , a first support base 14 , a second support base 15 and a first motor 16 . The cover 13 is mounted on the first support base 14 and the second support base 15 . There is a conveyor belt 17 between the first support base 14 and the second support base 15 , and the outer surface of the conveyor belt 17 has anti-slip stripes 18 . The conveying belt 17 has second conveying rollers 19 on both sides in the middle, and a rotating shaft 20 in the middle of the second conveying roller 19 . The inside of the housing 13 also has a scanner 21 , the scanner 21 is located at the upper end of the conveyor belt 17 , and the scanner 21 has a first infrared sensor 22 .

The outer cover 13 also has a first cylinder 23 , and the first cylinder 23 has a baffle plate 24 , and the baffle plate 24 is installed at the rear end of the outer cover 13 .

The cover 13 has a second motor 25, the second motor 25 has a first gear 26, the inside of the cover 13 has a lead screw 27, the cover 13 has a through hole 28, the lead screw 27 is installed in the through hole 28, the lead screw 27 It includes a first threaded portion 29, a second threaded portion 30, a second gear 31 and a sliding portion 32. The sliding portion 32 is located at both ends of the screw rod 27, the second gear 31 is in the middle of the screw rod 27, and the first threaded portion 29 The second threaded portion 30 and the second threaded portion 30 are at both ends of the second gear 31 and are respectively connected with the sliding portion 32 . The sliding portion 32 is placed in the through hole 28 .

The screw rod 27 has a clamping member 33, the clamping member 33 is installed on the first threaded part 29 and the second threaded part 30 respectively, the clamping member 33 has a moving part 34 and a clamping part 35, and the moving part 34 is installed on the screw The rod 27 and the moving part 34 also have threads (not shown in the figure), which are respectively matched with the first threaded part 29/the second threaded part 30. The clamping part 35 has a limit part 36 and a first notch 37, the limit part 36 is at both ends of the first notch 37, the limit part 36 has a roller groove 38 and a positioning groove 39 in the middle, and the roller groove 38 has a roller 40. There is a positioning block 41 in the positioning groove 39, the roller 40 is installed on the positioning block 41, the positioning block 41 has a positioning rod 42, and the outside of the positioning rod 42 is covered with a first spring 43, the groove of the roller groove 38 and the groove of the positioning groove 39 There is a mounting plate 44 at the mouth, the mounting plate 44 is mounted on the clamping member 33 by screws 45, the mounting plate 44 has a positioning hole 46, the positioning rod 42 is placed in the positioning hole 46, and one end of the first spring 43 is in contact with the positioning block 41. , and the other end is in contact with the mounting plate 44 .

When the blood collection tube 5 is transported to the conveyor belt 7 in the housing 13 , the first infrared sensor 22 receives the information, and the first air cylinder 23 quickly drops the baffle plate 24 to block the blood collection tube 5 . Then the second motor 25 drives the first gear 26 to rotate, the first gear 26 drives the second gear 31 on the screw rod 27 to rotate, so that the screw rod 27 rotates, the sliding part 32 moves in the through hole 28, the first threaded part 29 and the The clamping members 33 on the two threaded portions 30 move. Since the thread directions on the first threaded portion 29 and the second threaded portion 30 are opposite, the clamping members 33 can move toward each other or move back. Therefore, the middle blood collection tube 5 can be clamped, the roller 40 in the middle of the limiting portion 36 contacts the blood collection tube 5 , and then the first spring 43 is compressed, and the positioning rod 42 moves in the positioning hole 46 . At this time, the first motor 16 can be started to drive the conveyor belt 17 to drive, and then the blood collection tube 5 is driven to rotate. Since the conveyor belt 17 has anti-slip stripes 18, the frictional force is large. The scanner 21 inside the housing 13 scans the label on the blood collection tube 5, and the label can be a barcode or a two-dimensional code.

When the scanning is completed, the second motor 25 rotates in the reverse direction, unfolds the clamping member 33, the first air cylinder 23 retracts the baffle plate 24, the blood collection tube 5 at the front end is transported by the conveyor belt 7, and the collection tube 33 in the middle of the clamping member 33 is transported. Vessel 5 is pushed away.

The sorting mechanism 3 is used for sorting the blood collection tubes 5 scanned in the scanning mechanism 2 .

The sorting mechanism 3 has a belt 47 , a third motor 48 and a support plate 49 , the support plate 49 has a rotating roller 50 , the rotating roller 50 is connected with the third motor 48 , and the third motor 48 is installed on the support plate 49 . Both ends of the rotating roller 50 are provided with bearings 51, the bearings 51 are provided with a fixed part 52, the fixed part 52 is provided with a positioning part 53, the positioning part 53 is provided with a plurality of transmission parts 54, the lower end of the transmission part 54 is provided with a hinge part 55, the belt 47 There is a fixed block 56 thereon, the fixed block 56 is provided with a rotating shaft 57, and the hinge part 55 is installed on the rotating shaft 57. The fixing member 52 has a plurality of second notches 58 , the fixing member 52 also has a second infrared sensor 59 , and the second infrared sensor 59 is at the front end of the second notches 58 .

The lower end of the second notch 58 has a top plate 60 , the lower end of the top plate 60 has a connecting rod 61 , the lower end of the connecting rod 61 has a third cylinder 62 , and the third cylinder 62 is installed on the bottom plate 76 .

The blanking mechanism 4 is used to collect the blood collection tubes 5 sorted by the sorting mechanism 3 .

The blanking mechanism 4 has a collection box 64 , and the collection box 64 is installed at the second notch 58 . A plurality of collection boxes 64 can be set, which are different types of collection boxes 64, some need to be detected, some need to be preserved, some need to be sampled, etc., which are set according to actual conditions.

The lower end of the collection box 64 has a connecting plate 65, the connecting plate 65 has a rotating motor 66, the rotating motor 66 has a motor rod 67, the motor rod 67 has three partial gears 68, and the tooth angle of the partial gears 68 is 120°, The angle between the three partial gears 68 is 120°. The inner wall of the collecting box 64 is provided with a limiting groove 69 , and a buffer plate 70 is arranged in the limiting groove 69 . In this way, the partial gears 68 at the three locations can drive the gear racks 71 at the three locations to engage with each other, without simultaneously causing the racks 71 at the three locations to move.

Both sides of the buffer plate 70 are provided with limit rod holes 72, the lower end of the limit slot 69 has a support block 73, the support block 73 has a limit rod 74, the limit rod 74 is placed in the limit rod hole 72, the limit rod A second spring 75 is sheathed on the outside of 74 , one end of the second spring 75 is in contact with the support block 73 , and the other end is in contact with the buffer plate 70 . When part of the gear 68 is not engaged with the rack 71 , the buffer plate 70 can be reset by the elastic force of the second spring 75 .

The belt 47 on the sorting mechanism 3 is driven by the third motor 48, and then the transmission member 54 on the belt 47 is moved to carry the blood collection tube 5 after scanning. Anti-slip stripes 18 are provided on it. The two ends of the conveying member 54 are placed on the positioning portion 53 of the fixing member 52 , and are placed on the top plate 60 only when they reach the second notch 58 . Then, the second infrared sensor 59 transmits a signal to a different third cylinder 63 when it receives the passing of the blood collection tube 5 . When the blood collection tube 5 needs to be carried into one of the collection boxes 64, the third cylinder 63 away from the collection box 64 pushes the top plate 60 upward, while the third cylinder 63 close to the collection box 64 pulls the top plate 60 to transfer The hinge part 55 at the lower end of the member 54 rotates on the rotating shaft 57 , and the plurality of transmission members 54 at the second notches 58 are rotated to be inclined, so that the blood collection tube 5 rolls into the collection box 64 .

At the same time, in order to prevent the blood collection tube 5 from breaking when it is rolled down, the motor rod 67 is driven to rotate by the rotating motor 66, first, the uppermost part of the gear 68 is rotated, and part of the gear 68 is meshed with the rack 71, the buffer plate 70 is dropped, and the second The spring 75 is compressed, the limit rod 74 enters the limit rod hole 72, the blood collection tube 5 rolls down and falls on the second buffer plate 70, and the motor rod 67 continues to rotate, so that the second buffer plate 70 is blocked. Pull down, and then continue to turn, pull down the third buffer plate 70, and then roll into the collection box 64. This structure effectively avoids the rupture of the blood collection tube 5 when it is rolled down from a high place, and also prevents the blood in the blood collection tube 5 from vibrating violently.

The bottom plate 76 is used to support the conveying mechanism 1 , the scanning mechanism 2 , the sorting mechanism 3 and the blanking mechanism 4 .

The controller 77 is used to control the conveying mechanism 1, the scanning mechanism 2, the sorting mechanism 3 and the blanking mechanism 4, and display information.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (5)

1. The utility model provides a full-automatic heparin tube letter sorting system which characterized in that includes:

the conveying mechanism is used for conveying the labeled blood collection tube;

the conveying mechanism is provided with a conveying motor, a fixing plate and a conveying belt, the fixing plate is arranged on two sides of the conveying belt, the conveying belt is arranged on the fixing plate through a first conveying roller, the conveying motor is arranged on the fixing plate and connected with the first conveying roller, the fixing plate is further provided with a fixing groove, a blocking piece is arranged in the fixing groove and provided with an installation part and an arc-shaped guide part, the installation part is arranged in the fixing groove, and the arc-shaped guide part extends to the upper end of the middle of the conveying belt;

the scanning mechanism is used for scanning the blood sampling tubes conveyed by the conveying mechanism to determine information on the labels, so that rear-end sorting is facilitated;

the scanning mechanism is provided with an outer cover, a first supporting seat, a second supporting seat and a first motor, the outer cover is installed on the first supporting seat and the second supporting seat, a conveying belt is arranged between the first supporting seat and the second supporting seat, second conveying rollers are arranged on two sides of the middle of the conveying belt, a rotating shaft is arranged in the middle of each second conveying roller, the first motor is installed on the first supporting seat and connected with one rotating shaft, a scanner is further arranged inside the outer cover and located at the upper end of the conveying belt, and a first infrared sensor is arranged on the scanner;

the outer cover is provided with a second motor, the second motor is provided with a first gear, the outer cover is internally provided with a screw rod, the outer cover is provided with a through hole, the screw rod is arranged in the through hole and comprises a first threaded part, a second gear and a sliding part, the sliding part is positioned at two ends of the screw rod, the second gear is positioned in the middle of the screw rod, the first threaded part and the second threaded part are positioned at two ends of the second gear and are respectively connected with the sliding part, the sliding part is arranged in the through hole, the thread directions of the first threaded part and the second threaded part are opposite,

the screw rod is provided with a clamping piece, the clamping piece is respectively arranged on a first screw thread part and a second screw thread part, the clamping piece is provided with a moving part and a clamping part, the moving part is arranged on the screw rod, the clamping part is provided with a limiting part and a first notch, the limiting part is arranged at two ends of the first notch, the middle of the limiting part is provided with a roller groove and a positioning groove, a roller is arranged in the roller groove, a positioning block is arranged in the positioning groove, the roller is arranged on the positioning block, the positioning rod is sleeved with a first spring, mounting plates are arranged at the notch parts of the roller groove and the positioning groove, the mounting plates are arranged on the clamping piece through screws, the mounting plates are provided with positioning holes, the positioning rod is arranged in the positioning holes, one end of the first spring is in contact with the positioning block, and the other end of the first spring is in contact with the mounting plates,

the sorting mechanism is used for sorting the blood sampling tubes scanned in the scanning mechanism;

the sorting mechanism is provided with a belt, a third motor and a supporting plate, wherein the supporting plate is provided with a rotating roller, the rotating roller is connected with the third motor, the third motor is installed on the supporting plate, two ends of the rotating roller are provided with bearings, the bearings are provided with fixing parts, the fixing parts are provided with positioning parts, the positioning parts are provided with a plurality of conveying parts, the lower ends of the conveying parts are provided with hinged parts, the belt is provided with a fixing block, the fixing block is provided with a rotating shaft, the hinged parts are installed on the rotating shaft, the fixing parts are provided with a plurality of second notches, the fixing parts are further provided with second infrared sensors, and the second infrared sensors are arranged at the front ends of the second notches;

the blanking mechanism is used for collecting the blood sampling tubes sorted by the sorting mechanism;

the blanking mechanism is provided with a collecting box which is arranged at the second notch;

the bottom plate is used for supporting the conveying mechanism, the scanning mechanism, the sorting mechanism and the blanking mechanism; and

and the controller is used for controlling the conveying mechanism, the scanning mechanism, the sorting mechanism and the blanking mechanism and displaying information.

2. The fully automated blood collection tube sorting system according to claim 1, wherein the conveyor belt has anti-slip stripes on its outer surface.

3. The fully automatic blood collection tube sorting system according to claim 1, wherein the housing further has a first cylinder thereon, the first cylinder having a striker plate thereon, the striker plate being mounted at a rear end of the housing.

4. The fully automatic blood collection tube sorting system according to claim 1, wherein the second notch has a top plate at a lower end thereof, a connecting rod is provided at a lower end of the top plate, and a third cylinder is provided at a lower end of the connecting rod and mounted on a bottom plate.

5. The fully automatic blood collection tube sorting system according to claim 1, wherein the collection box has a connection plate at a lower end thereof, the connection plate has a rotating motor thereon, the rotating motor has a motor shaft thereon, the motor shaft has three partial gears thereon, a tooth angle of the partial gears is 120 °, an angle between the three partial gears is 120 °, the collection box has a limiting groove on an inner wall thereof, a buffer plate is disposed in the limiting groove, the buffer plate has a rack at a lower end thereof, the rack is engaged with the partial gears, the buffer plate has limiting rod holes at both sides thereof, the limiting groove has a support block at a lower end thereof, the support block has a limiting rod disposed therein, the limiting rod is disposed in the limiting rod hole, a second spring is sleeved outside the limiting rod, and one end of the second spring is in contact with the support block, the other end is contacted with the buffer plate.

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