A blood vessel stent blow molding equipment

Abstract

The present invention belongs to the technical field of vascular stent processing, and discloses a vascular stent blow molding device, including a fixed support, an upper clamping device and a lower clamping device. The upper clamping device is slidably connected to the fixed support, including an upper cylinder assembly and a claw assembly, the upper cylinder assembly includes a cylinder barrel and a first piston shaft, the claw assembly is arranged in the cylinder barrel, the first piston shaft can reciprocate along the axial direction of the cylinder barrel and drive the claw assembly to clamp or release the stent tube blank; the lower clamping device is also provided with a claw assembly, the two claw assemblies clamp the two ends of the stent tube blank respectively, the lower clamping device also includes a driving shaft that can drive the claw assembly to clamp or release the stent tube blank, and the driving shaft includes an inflation hole that can communicate with the stent tube blank. The vascular stent blow molding device of the present invention has a compact structure and high integration, and the stent tube blank extends into the claw assembly for a shorter length, thereby reducing the waste of the stent tube blank caused by clamping.

Description

Technical Field

[0001] The invention relates to the technical field of vascular stent processing, and in particular to a vascular stent blow molding device. Background Art

[0002] As an industry closely related to people's health, users have high quality requirements for medical products, especially vascular stents used in the body. Vascular stents refer to the placement of internal stents in the lesion segment on the basis of luminal balloon dilatation to support the narrowed and occluded segment of the blood vessel, reduce the elastic retraction and reshaping of the blood vessel, and maintain smooth blood flow in the lumen. The quality of vascular stents directly affects the success of the operation and postoperative recovery. Vascular stents are formed by heating, blow molding and stretching stent tube blanks. There are not many varieties of absorbable vascular stents on the market, and most of them use the clamping method of non-absorbable stents. The clamping mechanism has a complex structure and low space utilization. The effective utilization rate of the stent tube blank is low, resulting in waste of stent tube blanks. Summary of the invention

[0003] The object of the present invention is to provide a vascular stent blow molding device with compact structure, high integration, shorter stent tube blank extending into the clamping claw assembly, and reduced waste of stent tube blank caused by clamping.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A vascular stent blow molding device, comprising:

[0006] Fixed bracket;

[0007] An upper clamping device, the upper clamping device is slidably connected to the fixed bracket, the upper clamping device includes an upper cylinder assembly and a claw assembly, the upper cylinder assembly includes a cylinder barrel and a first piston shaft, the claw assembly is arranged in the cylinder barrel, the first piston shaft can reciprocate along the axial direction of the cylinder barrel, and drive the claw assembly to clamp or release the bracket tube blank, and the upper clamping device can stretch the bracket tube blank; and

[0008] A lower side clamping device, the lower side clamping device is fixedly connected to the fixed bracket, the lower side clamping device and the upper side clamping device are both provided with a claw assembly, the two claw assemblies are respectively used to clamp the two ends of the bracket tube blank, the lower side clamping device also includes an inflation assembly, the inflation assembly includes a driving shaft, the driving shaft can drive the claw assembly to clamp or release the bracket tube blank, the driving shaft includes an inflation hole, and the inflation hole can be connected to the bracket tube blank.

[0009] As a preferred structure of the present invention, the claw assembly includes:

[0010] A guide plate, the guide plate is fixedly connected to the cylinder barrel, the guide plate comprises a first guide hole, and the bracket tube blank can pass through the first guide hole;

[0011] At least three claws, at least three of which are arranged around the axis of the first guide hole, and at least three of which can be gathered or dispersed along the radial direction of the first guide hole, and when the at least three claws are gathered, they can clamp the stent tube blank;

[0012] A clamping claw tightening sleeve, wherein the clamping claw tightening sleeve is arranged in the cylinder barrel, the clamping claw tightening sleeve can reciprocate along the axial direction of the cylinder barrel, and one end of the clamping claw tightening sleeve has a receiving cavity, and the receiving cavity can clamp and close the clamping claw;

[0013] A claw spreading block, wherein the claw spreading block is disposed between the claw tightening sleeve and the claw, and the claw spreading block can slide along the axial direction of the first guide hole and disperse at least three claws; and

[0014] A first driving spring, one end of which is connected to the claw tightening sleeve, and the other end of which is connected to the claw spreading block, and the first driving spring can drive the claw spreading block to slide axially along the first guide hole.

[0015] As a preferred structure of the present invention, the upper clamping device also includes a first seal, one end of which abuts against the first piston shaft, and the other end abuts against the claw tightening sleeve. The first seal is provided with a second guide hole, and the second guide hole can clamp the bracket tube blank.

[0016] As a preferred structure of the present invention, the claw assembly also includes a second driving spring, which is a spring circle. A clamping groove is provided at the other end of the claw away from the claw support block, and at least three clamping grooves are interconnected to form an annular groove shape. The second driving spring clamps the clamping groove, and the second driving spring is configured to disperse at least three of the claws.

[0017] As a preferred structure of the present invention, it also includes a floating adjustment device, and the floating adjustment device includes:

[0018] A mounting bracket, the mounting bracket being slidably connected to the fixing bracket;

[0019] A ball bushing, the ball bushing being fixedly connected to the mounting bracket;

[0020] A sliding shaft, one end of which is slidably connected to the ball bushing, and the other end of which is fixedly connected to the upper clamping device, and a support plate is detachably connected to the sliding shaft;

[0021] a pressure sensor contact cover, the pressure sensor contact cover being detachably connected to the support plate; and

[0022] A pressure sensor is disposed on the mounting bracket, and an upper side of the pressure sensor abuts against the pressure sensor contact cover.

[0023] As a preferred structure of the present invention, the floating adjustment device further includes a limit assembly, and the limit assembly includes:

[0024] A roller bearing, wherein the roller bearing is fixedly connected to the sliding shaft;

[0025] an adjusting shaft, the adjusting shaft being rotatably connected to the roller bearing; and

[0026] A guide bracket is fixedly connected to the ball bushing, the guide bracket comprises a guide groove, the length direction of the guide groove extends along the axial direction of the sliding shaft, and the guide groove is clamped with the adjustment shaft.

[0027] As a preferred structure of the present invention, the floating adjustment device also includes a sensor fixing plate and two equal-height support frames, the two ends of the sensor fixing plate are respectively fixedly connected to the two equal-height support frames, the two equal-height support frames are arranged on the mounting bracket and are located on both sides of the pressure sensor contact cover, the sensor fixing plate passes through the pressure sensor contact cover and has a floating gap with the support plate, and the lower side of the pressure sensor is connected to the sensor fixing plate.

[0028] As a preferred structure of the present invention, the inflatable component also includes:

[0029] A connecting frame, wherein the connecting frame is provided with a guide hole, the claw assembly is arranged in the guide hole, and the drive shaft can reciprocate along the axial direction of the guide hole;

[0030] An air pipe joint is connected to the driving shaft, one end of the air pipe joint is connected to the inflation hole, and the other end is connected to an external high-pressure air source.

[0031] As a preferred structure of the present invention, the lower side clamping device also includes a sealing joint and a second sealing member, the sealing joint is connected to the drive shaft; one end of the second seal abuts against the drive shaft, and the other end abuts against the claw tightening sleeve, the second seal is provided with a third guide hole, and the third guide hole is clamped into the bracket tube blank, one end of the sealing joint is connected to the third guide hole, and the other end is connected to the inflation hole.

[0032] As a preferred structure of the present invention, the lower clamping device also includes a lower cylinder assembly, and the lower cylinder assembly includes a second piston shaft, which is detachably connected to the drive shaft and can drive the drive shaft to reciprocate axially along the guide hole.

[0033] Beneficial effects of the present invention: The vascular stent blow molding equipment provided by the present invention has an upper clamping device and a lower clamping device both provided with a claw assembly, and the two claw assemblies are respectively used to clamp the two ends of the stent tube blank, so as to complete the blow molding process of the stent tube blank; the claw assembly is arranged in the cylinder barrel, with a compact structure and high integration; one of the claw assemblies clamps or releases the stent tube blank with the reciprocating motion of the first piston shaft, and the other claw assembly clamps or releases the stent tube blank with the movement of the driving shaft, with a compact structure and reliable clamping, and the stent tube blank extends into the claw assembly for a shorter length, thereby reducing the waste of the stent tube blank caused by clamping; the inflation hole in the driving shaft can inject high-pressure nitrogen into the stent tube blank, and the processing is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of an upper clamping device and a floating adjustment device provided in an embodiment of the present invention;

[0035] Figure 2 It is a structural front view of the upper clamping device and the floating adjustment device provided by an embodiment of the present invention;

[0036] Figure 3 The embodiment of the present invention provides Figure 2 Cross-sectional view along AA direction;

[0037] Figure 4 is a schematic structural diagram of a lower side clamping device provided by an embodiment of the present invention;

[0038] Figure 5 is a structural front view of the lower clamping device provided by an embodiment of the present invention;

[0039] Figure 6 The embodiment of the present invention provides Figure 5 Cross-sectional view along direction BB.

[0040] In the figure:

[0041] 1. Upper clamping device; 11. Upper cylinder assembly; 111. Cylinder barrel; 112. First piston shaft; 113. Third drive spring; 114. Spring guide; 115. Air pipe; 12. Claw assembly; 121. Guide plate; 1211. First guide hole; 122. Claw; 123. Claw tightening sleeve; 124. Claw opening block; 125. First drive spring; 126. Second drive spring; 13. First sealing member; 131. Second guide hole;

[0042] 2. Lower clamping device; 21. Inflatable assembly; 211. Drive shaft; 2111. Inflatable hole; 212. Connecting frame; 2121. Guide hole; 213. Air pipe joint; 22. Sealing joint; 23. Second sealing member; 231. Third guide hole; 24. Lower cylinder assembly; 241. Second piston shaft; 25. Push rod; 26. Stop block; 27. Precision adjustment slide; 28. Adjustment substrate;

[0043] 3. Floating adjustment device; 31. Mounting bracket; 32. Ball bushing; 33. Sliding shaft; 34. Pressure sensor contact cover; 35. Pressure sensor; 36. Limiting assembly; 361. Roller bearing; 362. Adjusting shaft; 363. Guide bracket; 3631. Guide groove; 37. Sensor fixing plate; 38. Equal height support frame; 39. Support plate. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0048] like Figure 1-Figure 6 As shown, an embodiment of the present invention provides a vascular stent blow molding device, including a fixed support, an upper clamping device 1 and a lower clamping device 2. The fixed support serves as a workbench (not shown in the figure), the upper clamping device 1 is slidably connected to the fixed support, and the lower clamping device 2 is fixedly connected to the fixed support. Both the lower clamping device 2 and the upper clamping device 1 are provided with a claw assembly 12, and the two claw assemblies 12 are respectively used to clamp the two ends of the stent tube blank. It can be understood that the upper clamping device 1 is arranged above the lower clamping device 2. The upper clamping device 1 includes an upper cylinder assembly 11 and a claw assembly 12. The upper cylinder assembly 11 includes a cylinder barrel 111 and a first piston shaft 112. The claw assembly 12 is arranged in the cylinder barrel 111. The first piston shaft 112 can reciprocate along the axial direction of the cylinder barrel 111 and drive the claw assembly 12 to clamp or release the bracket tube blank. The upper clamping device 1 can stretch the bracket tube blank. When the two ends of the bracket tube blank are clamped, a tensile force is applied to the upper clamping device 1 through a stretching device (not shown in the figure) and acts on the bracket tube blank, thereby performing a stretching process. The lower clamping device 2 also includes an inflation assembly 21. The inflation assembly 21 includes a drive shaft 211. The drive shaft 211 can drive the claw assembly 12 to clamp or release the bracket tube blank. The drive shaft 211 includes an inflation hole 2111. The inflation hole 2111 can communicate with the bracket tube blank. After the stent tube blank is clamped, high-pressure nitrogen is injected through the inflation hole 2111 to blow mold the stent tube blank. The vascular stent blow molding device of the embodiment of the present invention can be equipped with a heating device according to process requirements during the stretching and blow molding process of the stent tube blank, which is not limited in this embodiment.

[0049] In the vascular stent blow molding equipment of the embodiment of the present invention, the upper clamping device 1 and the lower clamping device 2 are both provided with a claw assembly 12, and the two claw assemblies 12 are respectively used to clamp the two ends of the stent tube blank, so as to stretch and blow-mold the stent tube blank; the claw assembly 12 is arranged in the cylinder barrel 111, with a compact structure and high integration; wherein, the claw assembly 12 of the upper clamping device 1 realizes the clamping or loosening of the stent tube blank with the reciprocating motion of the first piston shaft 112, and the claw assembly 12 of the lower clamping device 2 realizes the clamping or loosening of the stent tube blank with the movement of the driving shaft 211, with a compact structure and reliable clamping, and the length of the stent tube blank extending into the claw assembly 12 is shorter, thereby reducing the waste of the stent tube blank caused by clamping; the inflation hole 2111 in the driving shaft 211 can simultaneously realize the injection of high-pressure nitrogen into the stent tube blank, and the processing is simple and efficient.

[0050] Furthermore, if Figure 3As shown, the claw assembly 12 includes a guide plate 121, at least three claws 122, a claw tightening sleeve 123, a claw expansion block 124 and a first driving spring 125. The guide plate 121 is fixedly connected to the cylinder barrel 111, and the guide plate 121 includes a first guide hole 1211, through which the bracket tube blank can pass and extend into the claw assembly 12. At least three claws 122 are arranged around the axis of the first guide hole 1211, and at least three claws 122 can be gathered or dispersed along the radial direction of the first guide hole 1211. When the at least three claws 122 are gathered, the bracket tube blank can be clamped. Preferably, the outer side of the claw 122 has an inclined surface, one end of the claw 122 is a small size end, and the other end is a large size end. After being gathered, the plurality of claws 122 are partially conical, with a through hole in the middle, and can effectively clamp the bracket tube blank. In other embodiments, more than three claws 122 may be provided, as long as the plurality of claws 122 can be surrounded in the circumferential direction to form a partial cone shape, the clamping is more secure, and the embodiment is not limited thereto. The claw tightening sleeve 123 is provided in the cylinder barrel 111, and the claw tightening sleeve 123 can reciprocate along the axial direction of the cylinder barrel 111. One end of the claw tightening sleeve 123 has a receiving cavity, and the receiving cavity can clamp and close the claws 122; preferably, the receiving cavity is conical and can completely fit the outer sides of the plurality of claws 122. It can be understood that as the claw tightening sleeve 123 reciprocates and gradually approaches the claw 122, the claw tightening sleeve 123 applies pressure to the claw 122, the pressure acts on the inclined surface of the claw 122, and causes the claw 122 to slide on the guide plate 121 and close in the radial direction of the first guide hole 1211, and the conical receiving cavity finally clamps at least three claws 122 inside, thereby clamping the stent tube blank. The claw expansion block 124 is arranged between the claw tightening sleeve 123 and the claw 122, and the claw expansion block 124 can slide along the axial direction of the first guide hole 1211 and disperse at least three claws 122. One end of the first drive spring 125 is connected to the claw tightening sleeve 123, and the other end is connected to the claw expansion block 124, and the first drive spring 125 can drive the claw expansion block 124 to slide along the axial direction of the first guide hole 1211. Preferably, the small-sized end of the claw 122 is provided with a groove with an inclined surface for accommodating the claw expansion block 124 and the first drive spring 125. Correspondingly, the outer side of the claw expansion block 124 also has an inclined surface, which can fit the groove at the upper end of the claw 122. When the claw tightening sleeve 123 reciprocates and gradually moves away from the claw 122, the compressed first drive spring 125 will produce elastic extension and drive the claw expansion block 124 to slide axially along the first guide hole 1211. The claw expansion block 124 applies pressure to the inclined surface of the groove at the small-sized end of the claw 122, causing the claw 122 to slide on the guide plate 121 and disperse radially along the first guide hole 1211, gradually leaving the conical receiving cavity, and realizing the loosening of the stent tube blank.The clamping claw assembly 12 has a compact structure, is convenient for clamping, and is quick to release. The length of the bracket tube blank extending into the clamping claw assembly 12 is shorter, thereby reducing the waste of the bracket tube blank caused by clamping.

[0051] Further, the upper clamping device 1 also includes a first seal 13, one end of the first seal 13 abuts the first piston shaft 112, and the other end abuts the claw tightening sleeve 123. The first seal 13 is provided with a second guide hole 131, and the second guide hole 131 can clamp the bracket tube blank. The bracket tube blank passes through the claw assembly 12 and extends into the second guide hole 131. The elastic first seal 13 always abuts the first piston shaft 112 and the claw assembly 12 to seal the bracket tube blank. In addition to realizing the closed clamping of the claw assembly 12, the first piston shaft 112 can also realize the sealing of the bracket tube blank, with a compact structure, and the length of the clamped bracket tube blank is small to avoid waste. Preferably, the first seal 13 is made of polyurethane, has good elasticity, and can always fit between the first piston shaft 112 and the claw assembly 12 when the first piston shaft 112 reciprocates, and has good sealing performance.

[0052] Furthermore, the claw assembly 12 also includes a second drive spring 126, which is a spring circle. The other end of the claw 122 away from the claw support block 124 is provided with a clamping groove, at least three clamping grooves are interconnected to form a circular groove, and the second drive spring 126 is clamped in the clamping groove, and the second drive spring 126 is configured to disperse at least three claws 122. It should be noted that the second drive spring 126 is in a compressed state in the clamping groove. When the claw tightening sleeve 123 reciprocates and gradually moves away from the claw 122, the second drive spring 126 will produce elastic reset, and drive the claw support block 124 to slide along the axial direction of the first guide hole 1211 to produce dispersion, thereby releasing the clamping of the stent tube blank. Because the second driving spring 126 is arranged at the other end of the claw 122 away from the claw opening block 124, it can drive the claw 122 from both ends simultaneously with the claw opening block 124, making the separation of multiple claws 122 smoother and avoiding the claws 122 from getting stuck or even falling over.

[0053] Specifically, the upper cylinder assembly 11 further includes an air pipe 115, a third drive spring 113 and a spring guide 114. Figure 1 As shown, the air pipe 115 is an air intake pipe connected to the cylinder barrel 111; Figure 3 As shown, one end of the third drive spring 113 is connected to the first piston shaft 112, and the other end is connected to the stepped hole of the cylinder barrel 111. Air is introduced through the air pipe 115 to control the first piston shaft 112 to move downward so that the claw assembly 12 clamps the bracket tube blank; when the claw assembly 12 needs to release the bracket tube blank, the air pipe 115 stops introducing air, and the third drive spring 113 is elastically reset to drive the first piston shaft 112 to move upward.

[0054] Furthermore, the vascular stent blow molding device of the embodiment of the present invention further includes a floating adjustment device 3, such as Figure 3 As shown, the floating adjustment device 3 includes a mounting bracket 31, a ball bushing 32, a sliding shaft 33, a pressure sensor contact cover 34 and a pressure sensor 35. The mounting bracket 31 is slidably connected to the fixed bracket, and can slide up and down along the fixed bracket under the action of a stretching device (not shown in the figure). The ball bushing 32 is fixedly connected to the mounting bracket 31; one end of the sliding shaft 33 is slidably connected to the ball bushing 32, and the other end is fixedly connected to the upper clamping device 1; through the ball bushing 32, the upper clamping device 1 can float up and down relative to the mounting bracket 31. A support plate 39 is detachably connected to the sliding shaft 33, and the pressure sensor contact cover 34 is detachably connected to the support plate 39. The pressure sensor 35 is arranged on the mounting bracket 31, and the upper side of the pressure sensor 35 abuts against the pressure sensor contact cover 34. It can be understood that under the action of the floating adjustment device 3, in the initial state, the value displayed by the pressure sensor 35 is the gravity of the pressure sensor contact cover 34, the support plate 39, the sliding shaft 33 and the upper clamping device 1; when the upper clamping device 1 stretches the bracket tube blank, the value displayed by the pressure sensor 35 can accurately control the tension on the bracket tube blank to ensure the dimensional accuracy of the processed bracket tube.

[0055] Furthermore, the floating adjustment device 3 also includes a limit assembly 36, which includes a roller bearing 361, an adjustment shaft 362 and a guide bracket 363. The roller bearing 361 is fixedly connected to the sliding shaft 33, and the adjustment shaft 362 is rotatably connected to the roller bearing 361. The guide bracket 363 is fixedly connected to the ball bushing 32, and the guide bracket 363 includes a guide groove 3631, the length direction of the guide groove 3631 extends along the axial direction of the sliding shaft 33, and the guide groove 3631 clamps the adjustment shaft 362. Through the limit assembly 36, the adjustment shaft 362 is clamped in the guide groove 3631 and cannot move along the circumferential direction of the ball bushing 32, so as to prevent the sliding shaft 33 from driving the upper clamping device 1 to rotate in the ball bushing 32, and prevent the bracket tube blank from twisting. The adjustment shaft 362 is connected to the sliding shaft 33 through the roller bearing 361, and can rotate along its own axis in the guide groove 3631 to avoid being stuck by the guide groove 3631.

[0056] Furthermore, the floating adjustment device 3 also includes a sensor fixing plate 37 and two equal-height support frames 38. The two ends of the sensor fixing plate 37 are respectively fixedly connected to the two equal-height support frames 38. The two equal-height support frames 38 are arranged on the mounting bracket 31 and are located on both sides of the pressure sensor contact cover 34. The sensor fixing plate 37 can be leveled through the two equal-height support frames 38, so that the measurement of the pressure sensor 35 is more accurate. The sensor fixing plate 37 passes through the pressure sensor contact cover 34, and there is a floating gap between the sensor fixing plate 37 and the support plate 39. The lower side of the pressure sensor 35 is connected to the sensor fixing plate 37. The floating gap can ensure the floating property of the upper clamping device 1, avoid affecting the measurement accuracy of the pressure sensor 35, and ensure that the tension on the bracket tube blank is accurate and constant.

[0057] Furthermore, the inflatable component 21 also includes a connecting frame 212 and an air pipe joint 213. Figure 6 As shown, the connecting frame 212 is provided with a guide hole 2121, and the claw assembly 12 is arranged in the guide hole 2121. The driving shaft 211 can reciprocate along the axial direction of the guide hole 2121, and drive the claw assembly 12 to clamp and release the bracket tube blank. Under the action of the driving shaft 211, the clamping and releasing principle of the claw assembly 12 is the same as the claw assembly 12 in the upper clamping device 1, and no further description is given here. The trachea joint 213 is connected to the driving shaft 211, one end of the trachea joint 213 is connected to the inflation hole 2111, and the other end is connected to the external high-pressure gas source, and the high-pressure nitrogen is input through the trachea joint 213 to blow the bracket tube blank. The driving shaft 211 can realize the high-pressure blowing of the bracket tube blank while driving the claw assembly 12 to clamp the bracket tube blank, and the structure is compact, which reduces the waste of the bracket tube blank caused by clamping.

[0058] Furthermore, the lower clamping device 2 further comprises a sealing joint 22 and a second sealing member 23, such as Figure 6 As shown, the sealing joint 22 is connected to the drive shaft 211. Preferably, the drive shaft 211 is provided with a stepped groove, and the sealing joint 22 is installed in the stepped groove to avoid movement; one end of the second sealing member 23 abuts the drive shaft 211, and the other end abuts the clamping claw tightening sleeve 123. The second sealing member 23 is provided with a third guide hole 231, and the third guide hole 231 clamps the bracket tube blank. One end of the sealing joint 22 is connected to the third guide hole 231, and the other end is connected to the inflation hole 2111; it can be understood that the bracket tube blank passes through the clamping claw assembly 12, passes through the third guide hole 231 in sequence, and is connected to the sealing joint 22, and can be connected with the inflation hole 2111. The second sealing member 23 can seal the bracket tube blank, and the sealing joint 22 supports the end of the bracket tube blank to ensure smooth intake of high-pressure nitrogen. Preferably, the second sealing member 23 uses polyurethane, which has good elasticity and good sealing performance.

[0059] Furthermore, the lower clamping device 2 also includes a lower cylinder assembly 24, and the lower cylinder assembly 24 includes a second piston shaft 241, which is detachably connected to the drive shaft 211 and can make the drive shaft 211 reciprocate axially along the guide hole 2121. The lower cylinder assembly 24 causes the drive shaft 211 to reciprocate axially through the second piston shaft 241. The reciprocating motion of the second piston shaft 241 is achieved through the air inlet and outlet pipes of the lower cylinder assembly 24, which is an existing structure in the art and will not be described in detail in this embodiment. Preferably, as Figure 6 As shown, the lower clamping device 2 also includes a push rod 25 and a limit block 26. The two ends of the push rod 25 are respectively connected to the second piston shaft 241 and the drive shaft 211. The limit block 26 is mounted on the second piston shaft 241 and can abut against the end surface of the drive shaft 211 away from the claw assembly 12, thereby limiting the sliding distance of the drive shaft 211 and avoiding failure of the drive shaft 211.

[0060] Specifically, Figure 4 As shown, the lower clamping device 2 also includes a precision adjustment slide 27 and an adjustment base plate 28. The precision adjustment slide 27 is connected to the lower cylinder assembly 24. The precision adjustment slide 27 can slide horizontally on the adjustment base plate 28, and the position of the inflation assembly 21 is adjusted through the lower cylinder assembly 24 to align the claw assembly 12 of the upper clamping device 1 and the claw assembly 12 of the lower clamping device 2 to avoid tilting or twisting of the bracket tube blank and ensure processing accuracy.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A vascular stent blow molding device, characterized in that: include: Fixed bracket; An upper clamping device (1), the upper clamping device (1) being slidably connected to the fixed bracket, the upper clamping device (1) comprising an upper cylinder assembly (11) and a claw assembly (12), the upper cylinder assembly (11) comprising a cylinder barrel (111) and a first piston shaft (112), the claw assembly (12) being arranged in the cylinder barrel (111), the first piston shaft (112) being capable of reciprocating along the axial direction of the cylinder barrel (111) and driving the claw assembly (12) to clamp or release the bracket tube blank, and the upper clamping device (1) being capable of stretching the bracket tube blank; and A lower clamping device (2), the lower clamping device (2) being fixedly connected to the fixed bracket, the lower clamping device (2) and the upper clamping device (1) both being provided with a claw assembly (12), the two claw assemblies (12) being used to clamp the two ends of the bracket tube blank respectively, the lower clamping device (2) further comprising an inflation assembly (21), the inflation assembly (21) comprising a drive shaft (211), the drive shaft (211) being capable of driving the claw assembly (12) to clamp or release the bracket tube blank, the drive shaft (211) comprising an inflation hole (2111), the inflation hole (2111) being capable of communicating with the bracket tube blank; It also includes a floating adjustment device (3), wherein the floating adjustment device (3) includes: A mounting bracket (31), the mounting bracket (31) being slidably connected to the fixing bracket; A ball bushing (32), the ball bushing (32) being fixedly connected to the mounting bracket (31); A sliding shaft (33), one end of the sliding shaft (33) being slidably connected to the ball bushing (32), and the other end being fixedly connected to the upper clamping device (1), and a support plate (39) being detachably connected to the sliding shaft (33); a pressure sensor contact cover (34), the pressure sensor contact cover (34) being detachably connected to the support plate (39); and a pressure sensor (35), the pressure sensor (35) being arranged on the mounting bracket (31), the upper side of the pressure sensor (35) abutting against the pressure sensor contact cover (34); The floating adjustment device (3) further comprises a limit assembly (36), wherein the limit assembly (36) comprises: A roller bearing (361), the roller bearing (361) being fixedly connected to the sliding shaft (33); an adjusting shaft (362), the adjusting shaft (362) being rotatably connected to the roller bearing (361); and A guide bracket (363), the guide bracket (363) being fixedly connected to the ball bushing (32), the guide bracket (363) comprising a guide groove (3631), the length direction of the guide groove (3631) extending along the axial direction of the sliding shaft (33), and the guide groove (3631) being clamped to the adjustment shaft (362); The floating adjustment device (3) further comprises a sensor fixing plate (37) and two equal-height support frames (38), the two ends of the sensor fixing plate (37) being respectively fixedly connected to the two equal-height support frames (38), the two equal-height support frames (38) being arranged on the mounting bracket (31) and being located on both sides of the pressure sensor contact cover (34), the sensor fixing plate (37) passing through the pressure sensor contact cover (34) and having a floating gap between the sensor fixing plate (37) and the support plate (39), and the lower side of the pressure sensor (35) being connected to the sensor fixing plate (37).

2. The vascular stent blow molding equipment according to claim 1, characterized in that: The claw assembly (12) comprises: A guide plate (121), the guide plate (121) being fixedly connected to the cylinder barrel (111), the guide plate (121) comprising a first guide hole (1211), and the bracket tube blank can pass through the first guide hole (1211); At least three claws (122), at least three of the claws (122) are arranged around the axis of the first guide hole (1211), and at least three of the claws (122) can be gathered or dispersed along the radial direction of the first guide hole (1211); when the at least three claws (122) are gathered, they can clamp the stent tube blank; A clamping claw tightening sleeve (123), the clamping claw tightening sleeve (123) being arranged in the cylinder barrel (111), the clamping claw tightening sleeve (123) being capable of axially reciprocating along the cylinder barrel (111), one end of the clamping claw tightening sleeve (123) being provided with a receiving cavity, the receiving cavity being capable of clamping and retracting the clamping claw (122); a claw spreading block (124), the claw spreading block (124) being arranged between the claw tightening sleeve (123) and the claw (122), the claw spreading block (124) being able to slide along the axial direction of the first guide hole (1211) and disperse at least three claws (122); and A first driving spring (125), one end of the first driving spring (125) is connected to the claw tightening sleeve (123), and the other end is connected to the claw spreading block (124), and the first driving spring (125) can drive the claw spreading block (124) to slide axially along the first guide hole (1211).

3. The vascular stent blow molding equipment according to claim 2, characterized in that: The upper clamping device (1) further comprises a first sealing member (13), one end of the first sealing member (13) abuts against the first piston shaft (112), and the other end abuts against the clamping claw tightening sleeve (123), and the first sealing member (13) is provided with a second guide hole (131), and the second guide hole (131) can clamp the bracket tube blank.

4. The vascular stent blow molding equipment according to claim 2, characterized in that: The clamping claw assembly (12) further comprises a second driving spring (126), wherein the second driving spring (126) is a spring ring, and a clamping groove is provided at the other end of the clamping claw (122) away from the clamping claw support block (124), and at least three clamping grooves are interconnected to form an annular groove shape, and the second driving spring (126) is clamped in the clamping groove, and the second driving spring (126) is configured to disperse at least three of the clamping claws (122).

5. The vascular stent blow molding equipment according to claim 1, characterized in that: The inflation component (21) further comprises: A connecting frame (212), the connecting frame (212) being provided with a guide hole (2121), the claw assembly (12) being arranged in the guide hole (2121), and the drive shaft (211) being capable of reciprocating along the axial direction of the guide hole (2121); An air pipe joint (213), the air pipe joint (213) being connected to the driving shaft (211), one end of the air pipe joint (213) being connected to the inflation hole (2111), and the other end of the air pipe joint (213) being connected to an external high-pressure air source.

6. The vascular stent blow molding equipment according to claim 2, characterized in that: The lower clamping device (2) further comprises a sealing joint (22) and a second sealing member (23); the sealing joint (22) is connected to the drive shaft (211); one end of the second sealing member (23) abuts against the drive shaft (211), and the other end abuts against the clamping claw tightening sleeve (123); the second sealing member (23) is provided with a third guide hole (231), and the third guide hole (231) clamps the bracket tube blank; one end of the sealing joint (22) is connected to the third guide hole (231), and the other end is connected to the inflation hole (2111).

7. The vascular stent blow molding equipment according to claim 5, characterized in that: The lower clamping device (2) further comprises a lower cylinder assembly (24), wherein the lower cylinder assembly (24) comprises a second piston shaft (241), wherein the second piston shaft (241) is detachably connected to the drive shaft (211) and is capable of driving the drive shaft (211) to reciprocate along the axial direction of the guide hole (2121).

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