Middle variable pitch device of safety needle

Abstract

The invention belongs to the technical field of safety needle automatic detection devices, and relates to a safety needle intermediate pitch changing device, which comprises a pitch changing mechanism, and is characterized in that the pitch changing mechanism comprises a slideway plate, a plurality of slideways are arranged on the slideway plate, and an included angle is formed between the extension directions of two adjacent slideways; each single sliding block assembly comprises a variable-pitch frame, a guide wheel and a normal-position vertical plate, and the guide wheels are rotationally installed at the bottom of the variable-pitch frame and are installed in all the sliding ways on the sliding way plate in a matched mode respectively; a shaft hole is formed in the variable-pitch frame, the variable-pitch guide shaft penetrates through the shaft hole of each single sliding block assembly, and the variable-pitch frame can slide in the axial direction of the variable-pitch guide shaft; the two shaft brackets are oppositely arranged on the two sides of the pitch changing mechanism, and the two ends of the pitch changing guide shaft are installed on the shaft brackets on the two sides respectively. The variable-pitch driving mechanism is used for driving the slideway plate to move up and down. The device not only adapts to the arrangement spacing of different production lines, but also can be matched with the grabbing spacing of the grabbing device.

Description

Technical Field

[0001] The invention relates to an intermediate distance changing device for a safety needle, belonging to the technical field of automatic detection devices for safety needles. Background Art

[0002] In the medical field, injection needles, blood collection needles, dispensing needles, flushing needles and other medical needles are widely used in various treatment and diagnosis processes. However, after use, most of these medical needles are discarded. Since traditional injection needles, blood collection needles, dispensing needles, flushing needles and other medical needles do not have safety protection devices, workers are often injured by needle sticks when cleaning waste and recycling, and there is also a risk of cross infection. For this reason, professionals have designed a variety of safety needles that can hide the needles after use to prevent harm to the human body. The sliding sleeve protection safety needle is one of them that is very convenient to operate.

[0003] The so-called sliding sleeve protection safety needle Z00, such as Figure 12-14 As shown, it includes a needle handle Z01 and a needle Z14 inserted in the needle handle Z01. The needle handle Z01 connects the needle Z14 with a hose Z12. The rear end of the hose Z12 is generally provided with a needle holder Z13. The needle handle Z01 is provided with a wing Z04. It also includes an inner sleeve Z05, an outer sleeve Z09 and a protective cap Z11 which are sleeved on the needle handle Z01. The factory state of the safety needle Z00 is that the outer sleeve Z09 and the inner sleeve Z05 are sleeved on the root of the needle handle Z01 in sequence, and the protective cap Z11 is sleeved on the head of the needle handle Z01 and protects the needle Z14. When in use, the medical staff pulls off the protective cap Z11, and it can be used like a normal needle. Before discarding after use, as Fig.13 As shown, the medical staff only needs to gently pull the outer sliding sleeve Z09 to make the outer sliding sleeve Z09 and the inner sliding sleeve Z05 unfold in sequence to protect the needle Z14. In this way, the needle Z14 will not stab the staff during the garbage transportation process, so it is called a safety needle Z00.

[0004] In order to prevent the inner sleeve Z05 and the outer sleeve Z09 from sliding randomly and affecting normal use, or from retracting under external force after being pulled apart and exposing the needle Z14 when discarded, a locking mechanism needs to be provided on the needle handle Z01, the inner sleeve Z05 and the outer sleeve Z09, and the locking mechanism includes a first card slot Z02 provided at the rear of the needle handle Z01, a second card slot Z03 provided at the front of the needle handle Z01, a first buckle Z06 provided at the rear of the inner sleeve Z05, a third card slot Z07 provided at the rear of the inner sleeve Z05, a fourth card slot Z08 provided at the front of the inner sleeve Z05 and a second buckle Z10 provided at the rear of the outer sleeve Z09. In the factory state, if Fig.12As shown, the first card slot Z02 and the first buckle Z06, the third card slot Z07 and the second buckle Z10 are respectively engaged with each other in a locked state, which will not affect normal operation. Fig.13 As shown, the first buckle Z06 and the second slot Z03, the second buckle Z10 and the fourth slot Z08 are respectively engaged in a locked state and will not retract.

[0005] Since the inner sleeve Z05, outer sleeve Z09 and needle handle Z01 are generally made of plastic, their slots and buckles cannot ensure precise fit, and the safety needle Z00 needs to be connected to adjacent parts by gluing on the production line, the inner sleeve Z05, outer sleeve Z09 and needle handle Z01 may be too tightly fitted in the factory state. If the medical staff cannot easily pull the sleeve, the environmental protection requirements for discarding the safety needle Z00 cannot be met. Therefore, it is very important to control the sleeve tension of each safety needle Z00 within the standard requirements, and whether it meets the requirements requires a pull-out test.

[0006] At present, this work can only be done by manual pulling and spot checking, which has the following shortcomings: first, the efficiency is too low and cannot be fully tested; second, the force is based on feeling without accurate standards; third, the stroke is not well controlled. Once it is pulled to the locked state when it is discarded, the whole thing is scrapped and cannot be restored. Given that the amount of injection needles as disposable consumables is very large, this inefficient and inaccurate manual inspection method obviously cannot meet actual needs. Therefore, in the production process of safety needles, an efficient and accurate tension detection device is needed to conduct comprehensive inspections of safety needles.

[0007] In order to ensure that the safety needles can smoothly enter the comprehensive testing process, the transfer device is first required to assist the grasping device and smoothly transfer the safety needles from the production line to the fixture of the tension testing equipment. However, due to production requirements, the safety needles are arranged adjacent to each other on the production line with a small spacing. This tight arrangement is not conducive to the grasping and transfer operation of the grasping device, so a transfer device that can solve this problem is needed.

[0008] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present inventive concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0009] The purpose of the present invention is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0010] The technical solution provided by the present invention is as follows: a distance changing device for a safety needle, comprising a distance changing mechanism, wherein the distance changing mechanism comprises:

[0011] A slideway plate, wherein a plurality of slideways are provided on the slideway plate, and an angle is formed between the extension directions of two adjacent slideways;

[0012] A plurality of groups of single slider assemblies, each group of the single slider assemblies comprises a pitch-changing frame, a guide wheel and a positing plate for positioning the safety needle, one or more positing plates are mounted on the upper part of the pitch-changing frame, the guide wheel is rotatably mounted on the bottom of the pitch-changing frame, and is respectively and adaptively mounted in each slideway on the slideway plate;

[0013] At least one pitch-changing guide shaft, the pitch-changing frame is provided with an axial hole, the pitch-changing guide shaft passes through the axial hole of each group of the single-slider assembly, and the pitch-changing frame can slide along the axial direction of the pitch-changing guide shaft;

[0014] Axle frames, two axle frames are arranged oppositely on both sides of the pitch-changing mechanism, and two ends of the pitch-changing guide shaft are respectively mounted on the axle frames on both sides;

[0015] The variable pitch drive mechanism is used to drive the slide plate to move up and down, thereby driving the guide wheel to move along the slide, and then driving the variable pitch frame to slide axially along the variable pitch guide shaft, so that two adjacent groups of single slider assemblies are moved closer to or away from each other.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: the present invention arranges a plurality of slideways on the slide plate, and drives the slide plate to move through a variable pitch drive mechanism. Under the guiding action of the slideways, the guide wheel can move along a preset path, thereby driving the entire single slider assembly to adjust its position along the variable pitch guide shaft, and then can flexibly adjust the spacing between two adjacent groups of single slider assemblies, and finally achieve the purpose of adjusting the spacing between adjacent safety needles. The present invention not only adapts to the arrangement spacing of different production lines, but also can match the gripping spacing of the gripping device, so that the present invention is suitable for the needs of different production stages, and improves versatility.

[0017] Based on the above technical solution, the present invention can also be improved as follows.

[0018] Furthermore, the center distance D between the starting ends of every two adjacent slideways is equal, and the center distance d between the ending ends of every two adjacent slideways is also equal.

[0019] The beneficial effect of adopting the above further solution is that, since the center distances of the starting end and the ending end are equal, when the guide wheel moves along the slideway to the starting end or the ending end, it can be ensured that the spacing between each group of single slider assemblies is the same.

[0020] Furthermore, it also includes a positioning mechanism, which includes a positioning guide shaft, a flap, a positioning drive mechanism and several groups of positioning frames, the positioning guide shaft passes through the axial hole on each group of the positioning frames, the positioning frames are connected to the variable distance frames via a connecting rod assembly, the positioning drive mechanism is transmission-connected to the positioning guide shaft, the positioning drive mechanism can drive the positioning frame to translate up and down, the positioning frame is provided with a rotating shaft, the flap is rotatably mounted on the rotating shaft, a shift block is provided on one side of the flap, the shift block is fixed on the variable distance frame, and when the positioning frame moves upward, the shift block shifts the flap to make it horizontal.

[0021] The beneficial effect of adopting the above further solution is that when the safety needle is placed on the intermediate distance changing device, the front and rear ends of the needle handle (i.e., the hose and the protective cap part) will be clamped, and because the hose has a certain flexibility, when the safety needle is placed, the disc on the needle handle may be tilted. At this time, when the shifting block shifts the flap to flip, the flap can level the tilted disc by rotating.

[0022] Furthermore, the connecting rod assembly includes a first connecting rod and a second connecting rod, and the upright frame, the first connecting rod, the second connecting rod and the variable pitch frame together form a parallelogram connecting rod mechanism.

[0023] The beneficial effect of adopting the above further solution is that the parallelogram linkage mechanism can drive the upright frame to move up and down, ensuring that the relative position relationship between the components remains stable throughout the entire movement process.

[0024] Furthermore, one or more upright plates are provided above the upright frame, and the upright plates are provided with upright limiting grooves.

[0025] The beneficial effect of adopting the above further scheme is that when the safety needle is accurately placed in the predetermined position, the front end of the safety needle can be well supported by the positioning limit groove on the positioning vertical plate, ensuring the stability and accuracy of the safety needle in subsequent operations and avoiding operational errors caused by position displacement or shaking.

[0026] Furthermore, the alignment drive mechanism includes a cylinder seat, an alignment drive cylinder and a guide shaft bracket, the guide shaft bracket is connected to the alignment guide shaft, the drive shaft of the alignment drive cylinder is connected to the guide shaft bracket, the cylinder body of the alignment drive cylinder is hinged on the cylinder seat, and the drive shaft of the alignment drive cylinder is tilted, and the drive shaft of the alignment drive cylinder can drive the alignment frame to move up and down when it is extended or retracted.

[0027] The beneficial effect of adopting the above further solution is that the driving shaft of the alignment drive cylinder is tilted, so that it can more effectively transmit the driving force to the guide shaft bracket when extending and retracting, thereby driving the alignment frame to move up and down.

[0028] Furthermore, the variable pitch drive mechanism includes a variable pitch drive cylinder and a guide rod, the cylinder body of the variable pitch drive cylinder is fixed on the cylinder seat, the drive shaft of the variable pitch drive cylinder is transmission-connected to the slide plate, and a guide rod is further provided between the slide plate and the cylinder seat.

[0029] The beneficial effect of adopting the above further scheme is that the variable pitch drive cylinder can more effectively transmit the driving force to the slide plate through the connection between its drive shaft and the slide plate seat, thereby driving the guide wheel to move along the slide, and the guide rod can enhance the stability and accuracy of this process, ensuring smooth movement.

[0030] Furthermore, it also includes a left baffle, a right baffle and a front baffle, and the left baffle, the right baffle and the front baffle are arranged around the circumference of the positioning frame.

[0031] Furthermore, it also includes an upper baffle, which is arranged above the front baffle, and two ends of the upper baffle are respectively connected to the left baffle and the right baffle through springs.

[0032] The beneficial effect of adopting the above further solution is that the upper baffle plate can limit the safety needle at the top, and when the flap levels the tilted disc, the upper baffle plate can effectively prevent the safety needle from being accidentally ejected.

[0033] Furthermore, it also includes a needle holder upright plate for placing the needle holder, the needle holder upright plate is provided with a needle holder upright limit groove, the rear end of the variable distance frame is connected to a bridge plate, and the needle holder upright plate is installed on the bridge plate.

[0034] The beneficial effect of adopting the above further solution is that the positive position limit groove of the needle holder can ensure that the needle holder is accurately placed at the predetermined position, thereby avoiding operational errors caused by position deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of the three-dimensional structure of the intermediate distance conversion device of the present invention;

[0037] Figure 2 For the present invention Figure 1 A magnified view of part A;

[0038] Figure 3 It is a schematic diagram of the internal structure of the intermediate shifting device of the present invention;

[0039] Figure 4 It is a structural schematic diagram of a single slider assembly of the present invention being installed on a slideway of a slideway plate through a guide wheel;

[0040] Figure 5 is a front view of the slide board of the present invention;

[0041] Figure 6 It is a structural schematic diagram of the present invention in which the flap and the safety needle are in an inclined state when the uprighting mechanism is lowered to a low position;

[0042] Figure 7 It is a structural schematic diagram of the flap of the righting mechanism of the present invention when it is in a horizontal position under the action of the shifting block;

[0043] Figure 8 It is a front view of the uprighting mechanism of the present invention when it is lowered to the low position;

[0044] Fig. 9 For the present invention Figure 8 Left view of;

[0045] Fig.10 It is a front view of the uprighting mechanism of the present invention when it rises to a high position;

[0046] Fig.11 For the present invention Fig.10 Left view of;

[0047] Fig.12 is a schematic diagram of the structure of a safety needle;

[0048] Fig.13 This is a schematic diagram of the structure of the safety needle in a state where the inner sliding sleeve and the outer sliding sleeve are pulled apart;

[0049] Fig.14 This is an exploded view of a safety pin;

[0050] In the figure, 610, pitch-changing mechanism; 611, slide plate; 6111, slide; 612, single slider assembly; 6121, pitch-changing frame; 6122, guide wheel; 6123, second hose aligning plate; 6124, third hose aligning plate; 613, pitch-changing guide shaft; 614, pitch-changing drive mechanism; 6141, pitch-changing drive cylinder; 6142, guide rod; 615, shaft frame; 616, needle holder aligning plate;

[0051] 620, alignment mechanism; 621, alignment guide shaft; 622, flap; 623, alignment frame; 624, shift block; 625, alignment drive mechanism; 6251, cylinder seat; 6252, alignment drive cylinder; 6253, guide shaft bracket; 626, cap alignment plate; 627, first hose alignment plate; 628, rotating shaft;

[0052] 630, support frame; 631, sliding seat plate; 632, mobile drive mechanism;

[0053] 640, connecting rod assembly; 641, first connecting rod; 642, second connecting rod;

[0054] 651, baffle frame; 652, upper baffle;

[0055] Z00, safety needle; Z01, needle handle; Z02, first slot; Z03, second slot; Z04, wing; Z05, inner sleeve; Z06, first buckle; Z07, third slot; Z08, fourth slot; Z09, outer sleeve; Z10, second buckle; Z11, protective cap; Z12, hose; Z13, needle holder; Z14, needle. DETAILED DESCRIPTION

[0056] The serial numbers assigned to the components herein, such as "first" and "second", are only used to distinguish the objects described and do not imply any priority in order or specific technical meaning. In addition, the concepts of "connection" and "coupling" mentioned in this application, unless otherwise specified, are deemed to include both direct connection (coupling) and indirect connection (coupling).

[0057] When interpreting the description of this application, it is necessary to clarify that the terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., which indicate positions or positional relationships, are based on the perspectives and layouts shown in the drawings, and are intended to facilitate explanation and simplify the description process, rather than being absolute limitations on the actual positions, construction methods, and operating modes of the devices or components. Therefore, these terms should not be understood as restrictive interpretations of the content of this application.

[0058] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0059] like Figure 1 - Fig.11As shown, a distance changing device for a safety needle comprises a distance changing mechanism 610, wherein the distance changing mechanism 610 comprises: a slide plate 611, wherein the slide plate 611 is provided with a plurality of slideways 6111, wherein an angle is formed between the extension directions of two adjacent slideways 6111; and a plurality of groups of single slider assemblies 612, wherein each group of the single slider assemblies 612 comprises a distance changing frame 6121, a guide wheel 6122 and a aligning plate for positioning the safety needle, wherein the distance changing frame 6121 carries the aligning plate and the guide wheel 6122, wherein one or more aligning plates are mounted on the upper part of the distance changing frame 6121, wherein the guide wheel 6122 is rotatably mounted on the bottom of the distance changing frame 6121, and is respectively and adaptively mounted in each slideway 6111 on the slide plate 611, wherein the guide wheel 612 is guided by the slideway 6111, and the guide wheel 612 is guided by the slideway 6111. 2 can move along a preset path; at least one pitch-changing guide shaft 613, the pitch-changing frame 6121 is provided with an axial hole, the pitch-changing guide shaft 613 passes through the axial hole of each group of the single slider assembly 612, so that the pitch-changing frame 6121 can slide along the axial direction of the pitch-changing guide shaft 613; an axis frame 615, two axis frames 615 are relatively arranged on both sides of the pitch-changing mechanism 610, and the two ends of the pitch-changing guide shaft 613 are respectively installed on the axis frames 615 on both sides; a pitch-changing driving mechanism 614, the pitch-changing driving mechanism 614 is used to drive the slide plate 611 to move up and down, thereby driving the guide wheel 6122 to move along the slide 6111, and then driving the pitch-changing frame 6121 to slide along the axial direction of the pitch-changing guide shaft 613, so that two adjacent groups of single slider assemblies 612 are close to or away from each other. The center distance D between the starting ends of every two adjacent slideways 6111 is equal, the center distance d between the ending ends of every two adjacent slideways 6111 is also equal, and the center distance D between the starting ends of the slideways 6111 is greater than the center distance d between the ending ends.

[0060] When the variable pitch drive mechanism 614 drives the slide plate 611 to move up and down, the movement of the slide plate 611 drives the guide wheel 6122 to move along the slide 6111, and the movement of the guide wheel 6122 drives the variable pitch frame 6121 to move along the variable pitch guide shaft 613, so as to adjust the spacing between each group of single slider assemblies 612. When the slide plate 611 moves upward, the guide wheel 6122 moves toward the end along the slide 6111, and each group of single slider assemblies 612 approaches each other. When the slide plate 611 moves downward, the guide wheel 6122 moves toward the starting end along the slide 6111, and each group of single slider assemblies 612 moves away from each other.

[0061] In this embodiment, two alignment plates are installed on the upper part of the variable distance frame 6121, which are the second hose alignment plate 6123 and the third hose alignment plate 6124. The second hose alignment plate 6123 is provided with a second hose alignment limit groove, and the third hose alignment plate 6124 is provided with a third hose alignment limit groove.

[0062] The intermediate distance changing device also includes a positioning mechanism 620, which includes a positioning guide shaft 621, a flap 622, a positioning drive mechanism 625 and a plurality of groups of positioning frames 623. The positioning guide shaft 621 passes through the shaft hole on each group of the positioning frames 623. The positioning frames 623 are connected to the distance changing frames 6121 through a connecting rod assembly 640. The positioning drive mechanism 625 is connected to the positioning guide shaft 621 in a transmission manner. The positioning drive mechanism 625 can The upright frame 623 is driven to move up and down. The upright frame 623 is provided with a rotating shaft 628. The flap 622 is rotatably mounted on the rotating shaft 628. The axis of the rotating shaft 628 is parallel to the placement direction of the safety needle. A shift block 624 is provided on one side of the flap 622. The shift block 624 is fixed on the pitch-changing frame 6121. When the upright frame 623 moves upward, the shift block 624 shifts the flap 622 to make it horizontal. When the safety needle is placed on the intermediate pitch-changing device, the front and rear ends of its needle handle (i.e., the hose and the protective cap part) will be clamped. Since the hose has a certain flexibility, when the safety needle is placed, the disc on the needle handle may be tilted. At this time, when the shift block 624 shifts the flap 622 to flip, the flap 622 can level the tilted disc by rotating.

[0063] In this embodiment, the rotating shaft 628 can rotate around its axis, and the flap 622 is fixed on the rotating shaft 628. When the shift block 624 shifts the flap 622, the flap 622 can rotate along with the rotating shaft 628. In addition, there is another configuration: the rotating shaft 628 is set as a fixed structure, and the flap 622 is installed on the rotating shaft 628 through a torsion spring. When the shift block 624 shifts the flap 622, the flap 622 can rotate around the fixed rotating shaft 628 alone.

[0064] The connecting rod assembly 640 includes a first connecting rod 641 and a second connecting rod 642 . The alignment frame 623 , the first connecting rod 641 , the second connecting rod 642 and the pitch-changing frame 6121 together form a parallelogram connecting rod mechanism.

[0065] The upper part of the alignment frame 623 is provided with two alignment plates, which are a protective cap alignment plate 626 and a first hose alignment plate 627. The protective cap alignment plate 626 and the first hose alignment plate 627 are respectively provided with a protective cap alignment limit groove and a first hose alignment limit groove. The two ends of the rotating shaft 628 are respectively connected to the protective cap alignment plate 626 and the first hose alignment plate 627. In the present embodiment, the two ends of the rotating shaft 628 are respectively connected to the protective cap alignment plate 626 and the first hose alignment plate 627. Of course, the rotating shaft 628 can also be installed by other structural supports.

[0066] The intermediate distance changing device also includes a needle holder upright plate 616 for placing the needle holder, and the needle holder upright plate 616 is provided with a needle holder upright limit groove. The rear end of the distance changing frame 6121 is connected to a bridge plate, and the needle holder upright plate 616 is installed on the bridge plate.

[0067] When the safety needle is accurately placed in the predetermined position, its protective cap will be limited and installed in the protective cap positive position limiting groove, and the hose will be firmly installed in the first hose positive position limiting groove, the second hose positive position limiting groove and the third hose positive position limiting groove in sequence along the length direction, and the needle holder will be limited and installed in the needle holder positive position limiting groove.

[0068] The alignment driving mechanism 625 includes a cylinder seat 6251, an alignment driving cylinder 6252 and a guide shaft bracket 6253. The cylinder seat 6251 is arranged between the two shaft frames 615. The cylinder seat 6251 is used to support the driving cylinder. In the present embodiment, the guide shaft bracket 6253 is U-shaped. The two arms of the guide shaft bracket 6253 are connected to the two ends of the alignment guide shaft 621. The driving shaft of the alignment driving cylinder 6252 is connected to the guide shaft bracket 6253. The cylinder body of the alignment driving cylinder 6252 is hinged on the cylinder seat 6251, and the driving shaft of the alignment driving cylinder 6252 is tilted. When the driving shaft of the alignment driving cylinder 6252 is extended, it can drive the alignment frame 623 to move obliquely upward to a high position. When the driving shaft of the alignment driving cylinder 6252 is retracted, it can drive the alignment frame 623 to move obliquely downward to a low position.

[0069] The variable pitch drive mechanism 614 includes a variable pitch drive cylinder 6141 and a guide rod 6142. The cylinder body of the variable pitch drive cylinder 6141 is fixed on the cylinder seat 6251. The drive shaft of the variable pitch drive cylinder 6141 is connected to the slide plate 611 via the slide plate seat. A guide rod 6142 is also provided between the slide plate seat and the cylinder seat 6251. When the driving shaft of the variable pitch drive cylinder 6141 extends upward, the slide plate 611 is driven to move upward, and the guide wheel 6122 installed at the bottom of the variable pitch frame 6121 moves downward along the slide 6111, and each group of single slider assemblies 612 gradually approaches each other, so that the safety pins provided on the single slider assemblies 612 approach each other. Conversely, when the driving shaft of the variable pitch drive cylinder 6141 retracts, the slide plate 611 is driven to move downward, and the guide wheel 6122 installed at the bottom of the variable pitch frame 6121 moves upward along the slide 6111, and each group of single slider assemblies 612 gradually moves away from each other, so that the safety pins provided on the single slider assemblies 612 move away from each other.

[0070] The intermediate shifting device also includes a baffle frame 651, and the baffle frame 651 includes a left baffle, a right baffle, a front baffle and an upper baffle 652. The left baffle, the right baffle and the front baffle are arranged around the peripheral side of the positioning frame 623. The upper baffle 652 is arranged above the front baffle, and the two ends of the upper baffle 652 are respectively connected to the left baffle and the right baffle through springs. In the process of the flap 622 leveling the inclined disc, the upper baffle 652 can effectively prevent the safety needle from being accidentally ejected. At the same time, when placing the safety needle, the operator can gently pull the upper baffle 652 a certain distance to avoid it interfering with the installation of the safety needle.

[0071] In addition, in this embodiment, the intermediate shifting device also includes a supporting frame 630, a sliding seat plate 631 is connected between the two axis frames 615, and a moving drive mechanism 632 is provided on the supporting frame 630. The moving drive mechanism 632 can drive the sliding seat plate 631 and the structure installed above the sliding seat plate 631 to move along a predetermined path on the supporting frame 630.

[0072] The working process of the intermediate distance changing device of the safety needle of the present invention includes two stages: normalization and distance changing. The specific operation steps are as follows:

[0073] Preparation stage: First, place the safety needle above the intermediate distance conversion device according to the preset position. During this process, the needle holder is placed in the limit groove of the needle holder alignment plate 616. At the same time, the second hose alignment plate 6123 and the third hose alignment plate 6124 support the two limit points of the hose to ensure the correct position of the hose. At this time, the telescopic shaft of the alignment drive cylinder 6252 is in a retracted state, and the alignment frame 623 is in a low position, ready for the next alignment operation.

[0074] Next, enter the correct position stage: Figure 6-Figure 11 First, the alignment drive cylinder 6252 is started, and its drive shaft is connected to the alignment guide shaft 621 through the U-shaped guide shaft bracket 6253. Due to the inclined setting of the drive shaft, the alignment frame 623 moves obliquely upward in parallel under the coordinated action of the four-bar linkage. When the alignment frame 623 slowly rises, the shifting block 624 fixed on the pitch-changing frame 6121 will touch and shift the flap 622. The flap 622 holds the disc on the safety needle during the flipping process, so that it gradually rotates from an inclined state to a horizontal state and levels it. When the alignment frame 623 moves to the highest position, the hose at the rear end of the needle handle is held by the first hose alignment vertical plate 627, and the protective cap is firmly held by the protective cap alignment vertical plate 626, thereby completing the entire alignment process.

[0075] Then, the pitch changing stage is entered: the pitch changing drive cylinder 6141 is started, and its telescopic shaft is connected to the slide plate 611 through the slide 6111 seat. Driven by the pitch changing drive cylinder 6141, the slide plate 611 moves in the vertical direction. As the slide plate 611 moves, the guide wheel 6122 installed at the bottom of the pitch changing frame 6121 moves along the preset slide 6111 path (i.e., the slide 6111). The movement of the guide wheel 6122 enables the pitch changing frame 6121 to slide axially along the pitch changing guide shaft 613. As the guide wheel 6122 and the pitch changing frame 6121 continue to move, the distance between each group of single slider assemblies 612 is adjusted accordingly. Since there is an angle between the extension directions of two adjacent slides 6111, and the center distance D at the starting end of the slide 6111 is greater than the center distance d at the end (reference Figure 5 ), when the slide plate 611 moves upward, each group of single slider assemblies 612 gradually approaches each other, thereby driving the safety pins placed on the pitch-changing frame 6121 to gradually approach each other; and when the slide plate 611 moves downward, each group of single slider assemblies 612 gradually moves away from each other, thereby driving the safety pins placed on the pitch-changing frame 6121 to gradually move away from each other. The pitch-changing process provides the necessary spacing adjustment for the grasping device to transfer the safety pins from the pitch-changing device to the tension detection device.

[0076] To sum up, the intermediate distance changing device of the safety needle of the present invention can not only automatically place the safety needle to a position where the needle handle is horizontal through the positioning and distance changing operations, but also adjust the spacing between adjacent safety needles, so as to adapt to the arrangement spacing of different production lines and meet the grasping spacing requirements of the grasping device.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety needle intermediate distance device, characterized in that: The invention comprises a pitch changing mechanism (610), wherein the pitch changing mechanism (610) comprises: A slideway plate (611), wherein a plurality of slideways (6111) are provided on the slideway plate (611), and an angle is formed between the extension directions of two adjacent slideways (6111); A plurality of groups of single slider assemblies (612), each group of the single slider assemblies (612) comprising a variable distance frame (6121), a guide wheel (6122) and a positioning vertical plate for positioning the safety needle, one or more of the positioning vertical plates being mounted on the upper portion of the variable distance frame (6121), the guide wheel (6122) being mounted on the bottom portion of the variable distance frame (6121) and being respectively and adaptively mounted in each slideway (6111) on the slideway plate (611); At least one pitch-changing guide shaft (613), an axial hole is formed on the pitch-changing frame (6121), the pitch-changing guide shaft (613) passes through the axial hole of each group of the single-slider assembly (612), and the pitch-changing frame (6121) can slide along the axial direction of the pitch-changing guide shaft (613); Axle frames (615), wherein two of the axle frames (615) are arranged oppositely on two sides of the pitch-changing mechanism (610), and two ends of the pitch-changing guide shaft (613) are respectively mounted on the axle frames (615) on the two sides; A variable pitch drive mechanism (614), wherein the variable pitch drive mechanism (614) is used to drive the slide plate (611) to move up and down.

2. The intermediate distance changing device for a safety needle according to claim 1, characterized in that: The center distance D between the starting ends of every two adjacent slideways (6111) is equal, and the center distance d between the ending ends of every two adjacent slideways (6111) is also equal.

3. The intermediate distance change device for a safety needle according to claim 1 or 2, characterized in that: The invention also comprises a positioning mechanism (620), wherein the positioning mechanism (620) comprises a positioning guide shaft (621), a flap (622), a positioning drive mechanism (625) and a plurality of groups of positioning frames (623), wherein the positioning guide shaft (621) passes through an axial hole on each group of the positioning frames (623), the positioning frames (623) are connected to the variable pitch frames (6121) via a connecting rod assembly (640), the positioning drive mechanism (625) is connected to the positioning guide shaft (621) in a transmission manner, and the positioning drive mechanism (625) is connected to the variable pitch frames (6121) via a connecting rod assembly (640). The mechanism (625) can drive the upright frame (623) to move up and down, the upright frame (623) is provided with a rotating shaft (628), the flap (622) is rotatably mounted on the rotating shaft (628), a shifting block (624) is provided on one side of the flap (622), the shifting block (624) is fixed on the pitch-changing frame (6121), and when the upright frame (623) moves upward, the shifting block (624) shifts the flap (622) to make it in a horizontal state.

4. The intermediate distance change device for a safety needle according to claim 3, characterized in that: The connecting rod assembly (640) comprises a first connecting rod (641) and a second connecting rod (642); the positioning frame (623), the first connecting rod (641), the second connecting rod (642) and the variable pitch frame (6121) together form a parallelogram connecting rod mechanism.

5. The intermediate distance change device for a safety needle according to claim 3, characterized in that: One or more upright plates are also arranged above the upright frame (623), and the upright plates are provided with upright limiting grooves.

6. The intermediate distance changing device for a safety needle according to claim 3, characterized in that: The alignment driving mechanism (625) comprises a cylinder seat (6251), an alignment driving cylinder (6252) and a guide shaft bracket (6253); the guide shaft bracket (6253) is connected to the alignment guide shaft (621); the driving shaft of the alignment driving cylinder (6252) is connected to the guide shaft bracket (6253); the cylinder body of the alignment driving cylinder (6252) is hinged on the cylinder seat (6251), and the driving shaft of the alignment driving cylinder (6252) is tilted; the driving shaft of the alignment driving cylinder (6252) can drive the alignment frame (623) to move up and down when it is extended or retracted.

7. The intermediate distance change device for a safety needle according to claim 6, characterized in that: The variable pitch drive mechanism (614) comprises a variable pitch drive cylinder (6141) and a guide rod (6142); the cylinder body of the variable pitch drive cylinder (6141) is fixed on the cylinder seat (6251); the drive shaft of the variable pitch drive cylinder (6141) is transmission-connected to the slide plate (611); and a guide rod (6142) is further provided between the slide plate (611) and the cylinder seat (6251).

8. The intermediate distance changing device for a safety needle according to claim 3, characterized in that: It also includes a baffle frame (651), the baffle frame (651) includes a left baffle, a right baffle and a front baffle, and the left baffle, the right baffle and the front baffle are arranged around the side of the upright frame (623).

9. The intermediate distance changing device for a safety needle according to claim 8, characterized in that: It also includes an upper baffle (652), which is arranged above the front baffle, and two ends of the upper baffle (652) are respectively connected to the left baffle and the right baffle through springs.

10. The intermediate distance change device for a safety needle according to claim 1, characterized in that: It also includes a needle holder upright plate (616) for placing the needle holder, the needle holder upright plate (616) is provided with a needle holder upright limit groove, the rear end of the variable distance frame (6121) is connected to a bridge plate, and the needle holder upright plate (616) is installed on the bridge plate.

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