An elastic hose clamp and its forming die and production process

Abstract

The present invention discloses an elastic hose clamp, its forming die and production process, relating to the technical field of hose clamps. An elastic hose clamp includes two clamping hoop segments and an elastic sheet. The two clamping hoop segments are hinged to each other. The elastic sheet is fixedly connected to one of the clamping hoop segments through a welding point and abuts against the other clamping hoop segment. A forming die for an elastic hose clamp includes a bending and punching die, a positioning and forming die, a connecting and forming die, and an elastic sheet forming die. A production process for an elastic hose clamp uses a steel strip to simultaneously perform stamping forming on the two clamping hoop segments. In the elastic hose clamp of the present invention, the stress at the welding point is small, and it is not easy to break, facilitating repeated use; the forming die and production process of the elastic hose clamp in the present invention can effectively reduce the dimensional deviation between the two clamping hoop segments in the same elastic hose clamp, and can improve production efficiency and reduce production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of hose clamps, and in particular to an elastic hose clamp, a forming die thereof, and a production process thereof. Background Art

[0002] Hose clamps are widely used in various instruments and vehicles, and are connecting fasteners for connecting pipes.

[0003] The prior invention patent with the authorized announcement number of CN102011906B discloses a special-shaped clamp, which has at least two clamp sections. The clamp sections have a trapezoidal shape with a base portion and two oppositely inclined side portions in cross-section; and at least one connecting section between the corresponding two clamp sections. It is desired that the special-shaped clamp can be applied even in the pipe connection under high-temperature conditions. For this purpose, it is arranged that the connecting section is configured as a bridge-shaped member connected to the clamp section.

[0004] The special-shaped clamp in the above patent document is a hose clamp, which is mainly used to connect rigid pipes with flanges at the ends. When the special-shaped clamp is placed around the flange and clamped, the side portions of the trapezoidal shape pull the two protrusions towards each other and fix the pipes to each other.

[0005] This special-shaped clamp needs to be made of a rigid material to have sufficient clamping force on the pipe. However, in order to facilitate the opening of the special-shaped clamp, the above patent document connects the two clamp sections by using a connecting section, so that the two clamp sections can be separated and have sufficient resilience. In the technical solution described in the above patent document, the connecting section and the clamp section are connected by solder joints. During use, the solder joints bear the tensile shear stress. After the connecting section is bent multiple times, stress concentration will occur at the solder joints, which is likely to cause fracture, posing a serious obstacle to the repeated use of the special-shaped clamp. Therefore, the present invention proposes an improvement solution for the above technical problems. Summary of the Invention

[0006] One of the purposes of the present invention is to provide an elastic hose clamp, which is convenient to open the hose clamp through two mutually hinged clamping hoop sections, and uses elastic sheets to provide elastic restoring force, facilitating the installation of the elastic hose clamp. In this way, the tensile stress can be transferred to the hinge of the clamping hoop section, and the stress on the solder joint at the connection between the elastic sheet and the clamping hoop section can be reduced, enabling repeated use multiple times.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions:

[0008] An elastic hose clamp includes two clamping hoop segments and an elastic sheet. The two clamping hoop segments are hinged to each other. The elastic sheet is fixedly connected to one of the clamping hoop segments through a welding point and abuts against the other clamping hoop segment. A fastening connection part is also arranged between the two clamping hoop segments.

[0009] By adopting the above technical solution, when installing this elastic hose clamp, the two clamping hoop segments can be directly opened and sleeved on the pipeline. The elastic sheet can provide a restoring force so that the clamping hoop segments can be clamped at the end of the pipeline. Finally, the two clamping hoop segments are firmly connected through the fastening connection part to complete the installation. During the use process, the hinge joint of the two clamping hoop segments bears all the tensile forces, so that the welding point between the elastic sheet and the clamping hoop segment does not bear stress. And when the two clamping hoop segments are opened, since the elastic sheet is only fixedly connected to one of the clamping hoop segments and will have relative slippage with the other clamping hoop segment, the stress at the welding point will also be smaller, effectively avoiding the fracture of the welding point caused by stress concentration. Therefore, this elastic hose clamp can be reused more times, and its safety and stability are also higher.

[0010] The present invention is further arranged as: the fastening connection part includes a fastening bolt and a fastening nut. A connection hole is opened at the end of the clamping hoop segment, and the fastening bolt passes through the connection hole.

[0011] By adopting the above technical solution, through the cooperation of the fastening bolt and the fastening nut, the two clamping hoop segments can be firmly fixed, and the fastening force can be adjusted.

[0012] The present invention is further arranged as: two elastic ears are fixedly arranged on the fastening nut. The connection hole on the corresponding side is of a rectangular structure, and the elastic ears are clamped into the connection hole on the corresponding side.

[0013] By adopting the above technical solution, when the fastening bolt is unscrewed, the fastening nut can still remain on the clamping hoop segment, effectively improving the convenience of disassembling and assembling this elastic hose clamp. And when the fastening bolt is screwed, the fastening nut will not rotate relatively, facilitating the installation and fastening of this elastic hose clamp.

[0014] The present invention is further arranged as: a plurality of gaskets are sleeved on the fastening bolt. The gaskets are of a bowl-shaped structure, and two gaskets are used in pairs by being buckled together.

[0015] By adopting the above technical solution, the gaskets can provide an elastic force. Compared with traditional spring washers, the above gaskets can be used in multiple pairs together, effectively increasing the elastic force.

[0016] The present invention is further arranged as: it further includes a limiting ring. The limiting ring is made of an elastic material and is threadedly connected to the fastening bolt.

[0017] By adopting the above technical solution, when disassembling the elastic hose clamp, the fastening bolt is screwed to separate it from the fastening nut. Due to the existence of the limiting ring, the fastening bolt will not fall off the clamping hoop section, thereby further improving the convenience of disassembling and assembling the elastic hose clamp.

[0018] The present invention is further configured as: the whole of the clamping hoop section is in a semi-circular arc structure, and a card slot penetrating in its length direction is formed on the clamping hoop section, and the card slot is in a trapezoidal structure.

[0019] By adopting the above technical solution, the card slot can clamp the pipe end, and the trapezoidal card slot can make the two pipes tighten naturally, improving the sealing performance at the connection of the two pipes.

[0020] Another object of the present invention is to provide a forming die for an elastic hose clamp, which is used for quickly and conveniently stamping and forming the clamping hoop section and the elastic sheet of the elastic hose clamp in the present invention.

[0021] The above technical object of the present invention is achieved through the following technical solutions:

[0022] A forming die for an elastic hose clamp includes a bending and punching die, a positioning and forming die, a connecting and forming die, and an elastic sheet forming die;

[0023] The bending and punching die includes a first upper die and a first lower die. A punching convex strip is formed on the first upper die, a punching groove that is in interference fit with the punching convex strip is formed on the first lower die, a positioning convex strip is formed on the first upper die, a positioning groove that is in interference fit with the positioning convex strip is formed on the first lower die, a matching hole is opened on the first upper die, and a punching pin column that is used in cooperation with the matching hole is penetrated and arranged on the first lower die;

[0024] The positioning and forming die includes a second upper die and a second lower die. A bending groove is opened on the second upper die, a bending protrusion that is in interference fit with the bending groove is formed on the second lower die, both the bending protrusion and the bending groove are in an arc structure, a positioning pin column is fixedly arranged on the second lower die, a knife groove is opened in the middle of the second upper die, and a punching knife that is used in cooperation with the knife groove is penetrated and arranged on the second lower die;

[0025] The connecting and forming die includes a third upper die and a third lower die. A forming pin column is arranged on the third upper die, and further includes a first forming die head and a second forming die head. The first forming die head moves horizontally and is used for bending the end of the workpiece, and the second forming die head moves vertically and is used for forcibly forming the end of the workpiece into an annular structure;

[0026] The elastic sheet forming die includes a fourth upper die and a fourth lower die, which are used for stamping and forming the elastic sheet.

[0027] By adopting the above technical solution, the clamping hoop section is formed by successively using a bending and punching die, a positioning and forming die, and a connecting and forming die, and the elastic piece is formed by using an elastic piece forming die. The bending and punching die is used to punch a clamping groove and a positioning groove on the raw material steel strip, and at the same time punch a connecting hole on the steel strip; the positioning and forming die positions the steel strip through the connecting hole on the steel strip, avoiding the deviation of the steel strip due to force, and also improving the synchronism and consistency of the extension of both ends of the steel strip. The positioning and forming die is used to bend the steel strip into an arc-shaped structure and cut off the steel strip; the connecting and forming die is used to process the end of the steel strip so that the end of the steel strip forms an annular structure for inserting a hinge pin column.

[0028] The present invention is further arranged as follows: a pressing column is slidably arranged in the matching hole, a baffle is slidably arranged on the upper side of the first upper die, the upper end of the pressing column abuts against the baffle, a tension spring is fixedly connected between one side of the baffle and the first upper die, a first wedge block is fixedly arranged on the side of the baffle away from the tension spring, a support plate is arranged on the lower side of the first lower die, and a second wedge block for cooperating with the first wedge block is fixed on one side of the support plate. The lower end of the punching pin column extends out of the first lower die and abuts against the support plate.

[0029] By adopting the above technical solution, when the first upper die presses down, since the pressing column is restricted by the baffle, the matching hole is closed, ensuring that the surface of the formed steel strip has better flatness. The first upper die remains in a pressed state with the first lower die. At this time, the first wedge block and the second wedge block abut against each other. Then, the support plate is pushed upward. First, the cooperation between the second wedge block and the first wedge block can move the baffle to expose the pressing column; then the support plate will abut against the punching pin column, causing the punching pin column to move upward to punch a limiting hole on the steel strip. Since the pressing column is no longer restricted at this moment, the pressing column can also move upward following the punching pin column, thus completing the entire punching operation.

[0030] The present invention is further arranged as follows: the upper end of the punching pin column is of an inclined surface structure, an inclined discharge channel is opened in the first upper die, the discharge channel is communicated with the matching hole, and a blanking wire is fixedly arranged at the connection of the matching hole and the discharge channel.

[0031] By adopting the above technical solution, the punching pin column can more easily punch a connecting hole on the steel strip, and can reduce the generation of burrs. And after the punching is in place, the blanking wire can separate the waste from the punching pin column, and the waste enters the discharge channel along the inclined surface of the punching pin column and is finally discharged from the first upper die.

[0032] Another object of the present invention is to provide a production process of an elastic hose clamp for manufacturing the elastic hose clamp in the present invention.

[0033] The above technical object of the present invention is achieved by the following technical solutions:

[0034] A raw material processing technology for an elastic hose clamp. First, a steel strip is cut into small segments of equal length. Then, a clamping groove for clamping the end of a pipeline is punched on each segment of the steel strip. At the same time, a positioning groove for separating the clamping hoop segments is punched in the middle of the steel strip. After that, two connecting holes are punched on both sides of the positioning groove;

[0035] The connecting holes are sleeved on the positioning pin columns. The two connecting holes are used to stabilize the steel strip and prevent the steel strip from shifting under force. Then, the steel strip is shaped and trimmed to form two semi-circular arc-shaped structures, and the steel strip is punched and cut from the positioning groove to form two clamping hoop segments;

[0036] After that, the positions of each clamping hoop segment that need to be hinged are punched so that the end of the clamping hoop segment forms an annular structure for inserting a hinge pin shaft;

[0037] An elastic sheet is manufactured by stamping and forming. After the clamping hoop segments are hinged through a hinge pin shaft, the elastic sheet is welded to one of the clamping hoop segments by spot welding, and the elastic sheet is wrapped outside the hinged part of the clamping hoop segment. Finally, the remaining parts of the fastening connection part are assembled.

[0038] In summary, the beneficial technical effects of the present invention are as follows:

[0039] (1) For the elastic hose clamp provided by the present invention, the hose clamp is facilitated to be opened by two mutually hinged clamping hoop segments, and the elastic sheet is used to provide an elastic restoring force, which is convenient for installing the elastic hose clamp. In this way, the stress of the tie can be transferred to the hinged part of the clamping hoop segments, and the stress at the welding point of the connection between the elastic sheet and the clamping hoop segment can be reduced, and it can be reused multiple times.

[0040] (2) For the forming die of the elastic hose clamp provided by the present invention, the bending and punching die is used to simultaneously complete the two processes of bending and punching the steel strip, thereby reducing the blank deviation generated during the punching process; the positioning and forming die is used to simultaneously complete the two processes of bending and cutting, and the steel strip is positioned through the connecting holes, reducing the positioning deviation that occurs during the transfer of the steel strip; the linking and forming die is used to form the end of the clamping hoop segment into an annular structure to facilitate the hinging of the clamping hoop segments; the positioning accuracy of the forming die is high, the number of processes is reduced, the production efficiency is improved, the number of die inputs is reduced, and the manufacturing cost is reduced.

[0041] (3) The production process of the elastic hose clamp provided by the present invention forms a positioning groove and a connection hole in the middle of the steel strip. In this way, during the subsequent bending of the steel strip to form an arc structure, even if the stamping die is replaced, the steel strip can be accurately positioned, and the extension lengths at both ends of the steel strip are ensured to be the same. The synchronism and consistency at both ends of the steel strip are relatively strong, and the overall deformation of the finally produced elastic hose clamp is small, and the installation accuracy is also higher. Description of the Drawings

[0042] Figure 1 is a schematic diagram of the overall structure of the elastic hose clamp in Embodiment 1 of the present invention;

[0043] Figure 2 is a schematic diagram of the structure of the clamping hoop section in Embodiment 1 of the present invention;

[0044] Figure 3 is a schematic diagram of the structure of the elastic sheet in Embodiment 1 of the present invention;

[0045] Figure 4 is a schematic diagram of the structure of the fastening connection part in Embodiment 1 of the present invention;

[0046] Figure 5 is a schematic diagram of the structure of the bending and punching die in Embodiment 2 of the present invention;

[0047] Figure 6 is a side cross-sectional view of the bending and punching die in Embodiment 2 of the present invention;

[0048] Figure 7 is a schematic diagram of the structure of the steel strip after being processed by the bending and punching die in Embodiment 2 of the present invention;

[0049] Figure 8 is a schematic diagram of the structure of the positioning and forming die in Embodiment 2 of the present invention;

[0050] Figure 9 is a schematic diagram of the structure of the steel strip after being processed by the positioning and forming die in Embodiment 2 of the present invention;

[0051] Figure 10 is a schematic diagram of the structure of the link forming die in Embodiment 2 of the present invention;

[0052] Figure 11 is a side view of the third upper die in the link forming die in Embodiment 2 of the present invention;

[0053] Figure 12 is a schematic diagram of the structure of the elastic sheet forming die in Embodiment 2 of the present invention.

[0054] Reference numerals: 1, clamping hoop section; 2, elastic sheet; 3, card slot; 4, connection hole; 5, welding point; 6, fastening bolt; 7, fastening nut; 8, elastic ear; 9, gasket; 10, limiting ring; 11, first upper die; 12, first lower die; 13, stamping rib; 14, stamping groove; 15, positioning rib; 16, positioning groove; 17, positioning slot; 18, mating hole; 19, punching pin column; 20, discharge channel; 21, blanking wire; 22, pressing column; 23, baffle; 24, tension spring; 25, first wedge block; 26, support plate; 27, second wedge block; 28, second upper die; 29, second lower die; 30, bending groove; 31, bending protrusion; 32, positioning pin column; 33, tool slot; 34, punching knife; 35, third upper die; 36, third lower die; 37, forming pin column; 38, cylinder; 39, insertion hole; 40, first forming die head; 41, second forming die head; 42, fourth upper die; 43, fourth lower die. Detailed implementation mode

[0055] The present invention will be clearly and completely described below in conjunction with the embodiments.

[0056] Embodiment 1:

[0057] See the attached Figure 1 , an elastic hose clamp, including two clamping hoop sections 1, an elastic sheet 2, and a fastening connection part.

[0058] See the attached Figure 2 , the overall structure of the clamping hoop section 1 is a semi-circular arc shape, and a card slot 3 running through its length direction is formed on the clamping hoop section 1. The card slot 3 is a trapezoidal structure. The trapezoidal card slot 3 can naturally tighten two pipelines and improve the tightness at the connection of the two pipelines. One end of the two clamping hoop sections 1 is hinged to each other through a hinge pin, and connection holes 4 are formed at the other ends of the two clamping hoop sections 1. One of the connection holes 4 is a circular structure, and the other connection hole 4 is a rectangular structure.

[0059] See the attached Figure 3 , the elastic sheet 2 is a U-shaped structure. The elastic sheet 2 is fixedly connected to one of the clamping hoop sections 1 through a welding point 5 and abuts against the other clamping hoop section 1. This structure of the elastic sheet 2 can have higher elasticity and is also convenient for covering the outside of the hinge joint of the two clamping hoop sections 1.

[0060] See the attached Figure 4 And in combination with the attached Figure 1, the fastening connection part includes a fastening bolt 6 and a fastening nut 7. The fastening bolt 6 passes through the connection hole 4. Two elastic ears 8 are fixedly arranged on the fastening nut 7. The fastening nut 7 is clamped into the rectangular connection hole 4 through the elastic ears 8. In this way, on the one hand, when the fastening bolt 6 is rotated, the fastening nut 7 will not rotate, which is convenient for screwing the fastening bolt 6 tightly; on the other hand, after the fastening bolt 6 is screwed to separate it from the fastening nut 7, the fastening nut 7 will not fall off the clamping hoop section 1, effectively improving the use convenience of this elastic hose clamp.

[0061] A plurality of gaskets 9 are sleeved on the fastening bolt 6. The gasket 9 is a bowl-shaped structure with a central opening, and two gaskets 9 need to be buckled together for paired use. The gasket 9 is arranged between the head of the fastening bolt 6 and the corresponding clamping hoop section 1 to provide an elastic force. Compared with the existing spring washers, the gasket 9 can be stacked in multiple pairs, so that the elastic force can be stronger.

[0062] A limit ring 10 is threadedly connected to the fastening bolt 6. The limit ring 10 is made of rubber material and is located between the two clamping hoop sections 1. When disassembling this elastic hose clamp, the fastening bolt 6 is screwed to separate it from the fastening nut 7. Due to the existence of the limit ring 10, the fastening bolt 6 will not fall off the clamping hoop section 1, thereby further improving the disassembly and assembly convenience of this elastic hose clamp.

[0063] The working principle of this embodiment is:

[0064] When installing this elastic hose clamp, the two clamping hoop sections 1 can be directly opened and sleeved on the pipeline. The elastic piece 2 can provide a restoring force so that the clamping hoop section 1 can be clamped at the end of the pipeline. Finally, the two clamping hoop sections 1 are tightly connected through the fastening connection part to complete the installation.

[0065] During the use process, the hinge joint of the two clamping hoop sections 1 bears all the tensile forces, so that the welding point 5 between the elastic piece 2 and the clamping hoop section 1 does not bear stress. And when the two clamping hoop sections 1 are opened, since the elastic piece 2 is only fixedly connected to one of the clamping hoop sections 1 and will have relative slippage with the other clamping hoop section 1, the stress at the welding point 5 will also be smaller, effectively avoiding the fracture of the welding point 5 caused by stress concentration. Therefore, this elastic hose clamp can be reused more times, and the safety and stability are also higher.

[0066] Embodiment Two:

[0067] A forming die for an elastic hose clamp is used to manufacture the clamping hoop section 1 and the elastic piece 2 of the elastic hose clamp in Embodiment One.

[0068] This forming die includes a bending and punching die, a positioning and forming die, a linking and forming die, and an elastic piece forming die.

[0069] See the appendix Figure 5 As shown in Figure 5 , the bending and punching die includes a first upper die 11 and a first lower die 12. A punching rib 13 is formed on the first upper die 11, and a punching groove 14 that is in embedded fit with the punching rib 13 is formed on the first lower die 12. A positioning rib 15 is formed on the first upper die 11, and a positioning groove 16 that is in embedded fit with the positioning rib 15 is formed on the first lower die 12. The punching rib 13 and the punching groove 14 are used to punch a clamping groove 3 on the steel strip. The positioning rib 15 and the positioning groove 16 are used to punch a positioning groove 17 on the steel strip. The function of the positioning groove 17 is to position the middle part of the steel strip and also facilitate the subsequent cutting of the steel strip.

[0070] See the appendix Figure 6 As shown in Figure 6 , a mating hole 18 is formed in the first upper die 11, and a punching pin 19 that is used in cooperation with the mating hole 18 is disposed through the first lower die 12. The upper end of the punching pin 19 is of an inclined surface structure. The punching pin 19 and the mating hole 18 are used to punch a connection hole 4. And the inclined surface structure at the upper end can make the punching pin 19 more easily punch the steel strip and reduce the generation of burrs. An inclined discharge channel 20 is formed in the first upper die 11. The discharge channel 20 is communicated with the mating hole 18, and a blanking wire 21 is fixedly disposed at the connection of the mating hole 18 and the discharge channel 20. After punching in place, the blanking wire 21 can separate the waste from the punching pin 19. The waste enters the discharge channel 20 along the inclined surface of the punching pin 19 and is finally discharged from the first upper die 11.

[0071] A pressing column 22 is slidably disposed in the mating hole 18. A baffle 23 is horizontally slidably disposed on the upper side of the first upper die 11. The upper end of the pressing column 22 abuts against the baffle 23. A tension spring 24 is fixedly connected between one side of the baffle 23 and the first upper die 11. A first wedge block 25 is fixedly disposed on the side of the baffle 23 away from the tension spring 24. A support plate 26 is disposed on the lower side of the first lower die 12. A second wedge block 27 that is used in cooperation with the first wedge block 25 is fixed on one side of the support plate 26. The lower end of the punching pin 19 extends out of the first lower die 12 and abuts against the support plate 26.

[0072] See the appendix Figure 8 As shown in Figure 8 , the positioning and forming die includes a second upper die 28 and a second lower die 29. A bending groove 30 is formed in the second upper die 28, and a bending protrusion 31 that is in embedded fit with the bending groove 30 is formed in the second lower die 29. Both the bending protrusion 31 and the bending groove 30 are of an arc structure. A positioning pin 32 is fixedly disposed on the second lower die 29. A cutting groove 33 is formed in the middle of the second upper die 28, and a cutting knife 34 that is used in cooperation with the cutting groove 33 is disposed through the second lower die 29.

[0073] See the appendix Figure 10, The link forming die includes a third upper die 35 and a third lower die 36. The third upper die 35 is located obliquely above the third lower die 36 and can move obliquely and press onto the third lower die 36. Referring to the attached Figure 11 , A forming pin column 37 is movably arranged on the third upper die 35. A cylinder 38 is fixed on the third upper die 35. The forming pin column 37 is fixedly connected to the piston rod of the cylinder 38. A socket hole 39 is formed on the third upper die 35 for inserting the forming pin column 37. The forming pin column 37 can also slide axially under the drive of the cylinder 38. It further includes a first forming die head 40 and a second forming die head 41. The first forming die head 40 moves horizontally and is used for bending the end of the workpiece. The second forming die head 41 moves vertically and is used for forcibly forming the end of the workpiece into an annular structure.

[0074] Refer to the attached Figure 12 , The elastic sheet forming die includes a fourth upper die 42 and a fourth lower die 43, which are used for stamping and forming the elastic sheet 2.

[0075] The working principle of this embodiment is:

[0076] The clamping hoop section 1 is formed in sequence by using the bending and punching die, the positioning and forming die, and the link forming die. The elastic sheet 2 is formed by using the elastic sheet forming die.

[0077] Among them, the bending and punching die is used to punch out the clamping groove 3 and the positioning groove 17 on the raw material steel strip, and at the same time punch out the connection hole 4 on the steel strip. After this process is completed, the structure of the steel strip is as Figure 7 shown. When the first upper die 11 presses down, since the top pressure column 22 is restricted by the baffle 23, the mating hole 18 is closed, ensuring a better flatness on the surface of the formed steel strip. The first upper die 11 maintains the pressing state with the first lower die 12. At this time, the first wedge block 25 and the second wedge block 27 are in mutual contact. Then, the support plate 26 is pushed up. First, the cooperation between the second wedge block 27 and the first wedge block 25 enables the baffle 23 to move and expose the top pressure column 22. Then, the support plate 26 will abut against the punching pin column 19, causing the punching pin column 19 to move upward to punch out the limiting hole on the steel strip. Since the top pressure column 22 is no longer restricted at this moment, the top pressure column 22 can also move upward following the punching pin column 19, thus completing the entire punching operation.

[0078] The positioning and forming die positions the steel strip through the connection hole 4 on the steel strip, avoiding the deviation of the steel strip due to force and improving the synchronism and consistency of the extension of both ends of the steel strip. Thus, after the steel strip is formed, the length error of the two obtained clamping hoop sections 1 is smaller. The positioning and forming die is used to bend the steel strip into an arc-shaped structure and cut the steel strip. After this process is completed, the structure of the steel strip is as Figure 9 shown.

[0079] The link forming die is used to process the end of the steel strip so that a ring structure for inserting the hinge pin column is formed at the end of the steel strip. The specific process is as follows: First, place the clamping hoop section 1 on the third lower die 36, then press down the third upper die 35 to clamp the clamping hoop section 1 tightly. At this time, the forming pin column 37 will abut against the bending position at the end of the clamping hoop section 1. Then, the first forming die head 40 moves horizontally to bend the end of the clamping hoop section 1 by 90°. After that, the second forming die head 41 moves downwards to cooperate with the forming pin column 37 to force the end of the clamping hoop section 1 to form a ring structure. Finally, the forming pin column 37 is withdrawn from the insertion hole 39 under the drive of the cylinder 38, and at the same time, the clamping hoop section 1 is unloaded.

[0080] Embodiment Three:

[0081] A raw tea process for an elastic hose clamp is used to manufacture the elastic hose clamp in Embodiment One.

[0082] First, cut the steel strip into equal-length small segments, then punch a clamping groove 3 for clamping the end of the pipe on each steel strip segment, and at the same time punch a positioning groove 17 for separating the clamping hoop section 1 in the middle of the steel strip. Then, punch two connecting holes 4 on both sides of the positioning groove 17.

[0083] Socket the connecting holes 4 on the corresponding positioning pin columns 32, use the two connecting holes 4 to stabilize the steel strip to prevent the steel strip from shifting under force, and then shape and trim the steel strip to form two semi-circular arc-shaped structures, and punch the steel strip from the positioning groove 17 to form two clamping hoop sections 1.

[0084] After that, perform stamping treatment on the position where each clamping hoop section 1 needs to be hinged so that a ring structure for inserting the hinge pin shaft is formed at the end of the clamping hoop section 1.

[0085] Manufacture the elastic piece 2 by stamping. After the clamping hoop sections 1 are hinged by the hinge pin shaft, weld the elastic piece 2 to one of the clamping hoop sections 1 by spot welding, and make the elastic piece 2 cover the outside of the hinged part of the clamping hoop section 1. Finally, assemble the remaining parts of the fastening connection part.

[0086] The working principle of this embodiment is as follows: When the raw material steel strip is punched to form the clamping hoop section 1, the steel strip will undergo plastic deformation at both ends and there will be a phenomenon of being stretched. If the single clamping hoop section 1 is directly stamped and formed, the amount of deformation of each clamping hoop section 1 may deviate, resulting in shape deviation of the overall elastic hose clamp produced finally, with poor fastening and sealing performance for pipeline connection. In more precise equipment, serious installation errors are likely to occur. In this embodiment, first, a positioning groove 17 and a connecting hole 4 are formed in the middle of the steel strip. In this way, during the subsequent process of bending the steel strip to form an arc structure, even if the stamping die is replaced, the steel strip can be accurately positioned, and the extension lengths at both ends of the steel strip can be ensured to be the same. The synchronism and consistency at both ends of the steel strip are relatively strong. The overall deformation of the finally produced elastic hose clamp is small, and the installation accuracy is also higher.

[0087] The above is only a preferred specific embodiment of the present invention, and does not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A forming die for an elastic hose clamp. The elastic hose clamp includes two clamping hoop segments (1) and an elastic sheet (2). The two clamping hoop segments (1) are hinged to each other. The elastic sheet (2) is fixedly connected to one of the clamping hoop segments (1) through a welding point (5) and abuts against the other clamping hoop segment (1). A fastening connection part is also provided between the two clamping hoop segments (1); The fastening connection part includes a fastening bolt (6) and a fastening nut (7). A connection hole (4) is formed at the end of the clamping hoop segment (1). The fastening bolt (6) passes through the connection hole (4); Two elastic ears (8) are fixedly provided on the fastening nut (7). The connection hole (4) on the corresponding side is of a rectangular structure. The elastic ears (8) are clamped into the connection hole (4) on the corresponding side; A plurality of gaskets (9) are sleeved on the fastening bolt (6). The gaskets (9) are of a bowl-shaped structure, and two gaskets (9) are used in pairs by being buckled together; It further includes a limit ring (10). The limit ring (10) is made of an elastic material and is threadedly connected to the fastening bolt (6); The clamping hoop segment (1) is of an overall semi-circular arc structure. A clamping groove (3) running through its length direction is formed on the clamping hoop segment (1). The clamping groove (3) is of a trapezoidal structure; The forming die is used to manufacture the clamping hoop section (1) and the elastic sheet (2) of the elastic hose clamp, and is characterized in that: It includes a bending and punching die, a positioning and forming die, a linking and forming die, and an elastic sheet forming die; The bending and punching die includes a first upper die (11) and a first lower die (12). A punching rib (13) is formed on the first upper die (11). A punching groove (14) that is in embedded fit with the punching rib (13) is formed on the first lower die (12). A positioning rib (15) is formed on the first upper die (11). A positioning groove (16) that is in embedded fit with the positioning rib (15) is formed on the first lower die (12). A fitting hole (18) is formed on the first upper die (11). A punching pin (19) that is used in cooperation with the fitting hole (18) is arranged through the first lower die (12); The positioning and forming die includes a second upper die (28) and a second lower die (29). A bending groove (30) is formed on the second upper die (28). A bending protrusion (31) that is in embedded fit with the bending groove (30) is formed on the second lower die (29). Both the bending protrusion (31) and the bending groove (30) are of an arc structure. A positioning pin (32) is fixedly provided on the second lower die (29). A knife groove (33) is formed in the middle of the second upper die (28). A punching knife (34) that is used in cooperation with the knife groove (33) is arranged through the second lower die (29); The linking and forming die includes a third upper die (35) and a third lower die (36). A forming pin (37) is arranged on the third upper die (35). It further includes a first forming die head (40) and a second forming die head (41). The first forming die head (40) moves horizontally and is used for bending the end of the workpiece. The second forming die head (41) moves vertically and is used for forcibly forming the end of the workpiece into an annular structure; The elastic sheet forming die includes an upper die 42 and a lower die 43 for stamping and forming the elastic sheet 2.

2. The forming die of an elastic hose clamp according to claim 1, characterized in that: A pressing column 22 is slidably arranged in the mating hole 18. A baffle 23 is slidably arranged on the upper side of the first upper die 11. The upper end of the pressing column 22 abuts against the baffle 23. A tension spring 24 is fixedly connected between one side of the baffle 23 and the first upper die 11. A first wedge block 25 is fixedly arranged on the side of the baffle 23 away from the tension spring 24. A supporting plate 26 is arranged on the lower side of the first lower die 12. A second wedge block 27 which is used in cooperation with the first wedge block 25 is fixed on one side of the supporting plate 26. The lower end of the punching pin column 19 extends out of the first lower die 12 and abuts against the supporting plate 26.

3. The forming die of an elastic hose clamp according to claim 2, characterized in that: The upper end of the punching pin column 19 is of an inclined surface structure. An inclined discharging channel 20 is formed in the first upper die 11. The discharging channel 20 is communicated with the mating hole 18. A blanking wire 21 is fixedly arranged at the connection part of the mating hole 18 and the discharging channel 20.

4. A production process for an elastic hose clamp, which is applied to the forming die of the elastic hose clamp described in claim 3, and is characterized in that: First, the steel plate strip is cut into small sections of equal length. Then, a clamping groove 3 for clamping the end of the pipeline is punched on each section of the steel plate strip. Meanwhile, a positioning groove 17 for separating the clamping hoop section 1 is punched in the middle of the steel plate strip. Then, two connecting holes 4 are punched on both sides of the positioning groove 17. The connecting holes 4 are sleeved on the positioning pin columns 32. The two connecting holes 4 are used to stabilize the steel plate strip to prevent the steel plate strip from shifting under force. Then, the steel plate strip is shaped and trimmed to form two semi-circular arc-shaped structures, and the steel plate strip is punched and broken from the positioning groove 17 to form two clamping hoop sections 1. Then, the positions of each clamping hoop section 1 that need to be hinged are punched to form an annular structure at the end of the clamping hoop section 1 for inserting the hinge pin. The elastic sheet 2 is manufactured by stamping and forming. After the clamping hoop sections 1 are hinged by the hinge pin, the elastic sheet 2 is welded to one of the clamping hoop sections 1 by spot welding, and the elastic sheet 2 is wrapped outside the hinge joint of the clamping hoop section 1. Finally, the remaining parts of the fastening connection part are assembled.

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