A clamp and joint

Abstract

The application discloses a clamp head and a joint. A pipe is inserted into the joint provided with the clamp head, and the pipe is clamped by the clamp head and the joint to be connected in the joint. The clamp head comprises a clamp jaw and a metal clamp sheet. The clamp jaw clamps the pipe inserted into the clamp head. After the metal clamp sheet is added to the clamp jaw, double clamping is realized, and the pipe is fixed more stably. When the clamp jaw is in a relaxed state, the metal clamp sheet can contact the pipe inserted into the clamp head. When the clamp jaw is in a force-tightening state, the metal clamp sheet can exceed the top of the elastic sheet and contact the pipe inserted into the clamp head. When the state of the clamp jaw changes, the clamp jaw rotates to the pipe direction and drives the metal clamp sheet to rotate. The length and angle of the metal clamp sheet are set, so that the metal clamp sheet can act on the pipe and clamp the pipe after the clamp jaw rotates.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipe connection, in particular to a clamp head and a joint. BACKGROUND

[0002] In modern life, the application of pipe is everywhere, some pipes are often used to transport substances such as gas, liquid, etc., some pipes are simply used to connect objects, which are convenient for people to hold or use, such as the rod of a handheld self-timer, a fitness bar in a gym, etc.

[0003] However, most of the connections between pipes are by welding or threaded connection, but welding is not easy to replace, and is generally used in situations where the pipe does not need to be replaced. The threaded connection between the pipes needs to be well matched in size, which is not very practical for some situations where the pipe needs to be replaced frequently. In general, the threaded connection of the pipe is achieved by providing threads on the end of the pipe, and connecting with another pipe with the same threaded end. When one of the pipes is damaged, a new pipe needs to be provided to match the other pipe in order to reconnect, which is not very convenient for people in their daily lives.

[0004] In the prior art, the pipe is inserted into the joint provided with the clamp head, and the clamp head is matched with the joint to achieve the connection between the pipe and the joint. However, in the matching process of the clamp head and the joint, the clamp head is gathered towards the pipe under the action of the joint, and the metal card provided on the clamp head will be deflected by a certain angle with the clamp head, so that the angle of the metal card is deflected and loses the clamping effect on the pipe. After the deflection, the metal card cannot contact the pipe, and loses the clamping effect on the pipe, so that the clamping effect of the joint on the pipe is reduced, and the pipe is likely to fall off from the joint. SUMMARY

[0005] In view of the above technical problems, the present application provides a clamp head and a joint, by setting the length and installation angle of the metal card, so that when the clamp jaw is in a relaxed state, the metal card can contact the pipe inserted into the head; when the clamp jaw is in a force-tightening state, the metal card can exceed the top of the clamp jaw and contact the pipe inserted into the clamp head, and can also act on the pipe and clamp the pipe.

[0006] The present application provides a clamp head and a joint, the clamp head comprising a cylindrical base, the base being connected with a cylindrical clamp jaw, the clamp jaw being used to clamp a pipe inserted into the clamp head;

[0007] The clamp jaw is provided with a spring, and the spring is at least one, when the spring is subjected to a force towards the axis of the clamp jaw, the spring can be gathered towards the center of the clamp jaw to tightly hold the pipe inserted into the clamp head;

[0008] Characterized in that the elastic sheet is provided with a metal card, the metal card protrudes from the elastic sheet and contacts the pipe inserted into the card head;

[0009] The base comprises a first end face and a second end face, the clamping jaw is connected to the first end face, and the first end face is used as a horizontal reference surface,

[0010] When the clamping jaw is in a relaxed state, the metal card can contact the pipe inserted into the card head;

[0011] When the clamping jaw is in a force-tightening state, the metal card can protrude beyond the top of the elastic sheet in the vertical plane of the first end face, contact and act on the pipe inserted into the card head to clamp the pipe.

[0012] Compared with the prior art, the card head and the joint of the application adopt the mode of clamping the pipe in an inserted manner, which is more inclusive than the traditional threaded connection, and the pipe to be connected does not need to be provided with a matching thread, and after the metal card is added to the card head when the joint is connected with the pipe, double clamping is realized, and the fixation of the pipe is more stable; when the state of the clamping jaw changes, the clamping jaw rotates in the direction of the pipe, and the metal card rotates together, the length and angle of the metal card are set in the application, so that after the clamping jaw rotates, the metal card can still act on the pipe and clamp the pipe, avoiding the situation that the metal card loses the effect when the state of the clamping jaw changes, and enhancing the clamping effect of the card head on the pipe.

[0013] Further, the elastic sheet comprises a protruding head, and the protruding head is provided with an upper conical surface and a lower conical surface;

[0014] The metal card is arranged on the inner wall of the protruding head, and the metal card protrudes from the intersection line between the parallel plane where the two conical surfaces of the protruding head intersect and the inner wall of the protruding head;

[0015] When the upper conical surface is subjected to a force in the direction of the axis of the clamping jaw, the elastic sheet can drive the metal card to gather towards the center of the clamping jaw;

[0016] When the clamping jaw is in a relaxed state, the included angle between the upper conical surface and the axis direction of the first end face is a second included angle, and 0°<θ2<90°;

[0017] The included angle between the metal card and the axis direction of the first end face is a third included angle, and 0°<θ3<90°.

[0018] Further, a circular annular limiting groove is arranged on the first end face, an outer circle of the limiting groove coincides with an outer circle of the first end face, an inner circle radius of the limiting groove is greater than an inner circle radius of the first end face, and the limiting groove is used for limiting the position of the clamp head in the pipe fitting connector.

[0019] An outer circle of the clamp claw coincides with an inner circle of the limiting groove, and an inner circle of the clamp claw coincides with an inner circle of the first end face.

[0020] A joint comprises a clamp head movably mounted in the joint for clamping a pipe inserted into the connecting cap;

[0021] The joint comprises a pipe and a connecting cap, and the pipe is connected with the connecting cap through threads;

[0022] A third end face and a fourth end face are arranged in the connecting cap, and the first end face of the clamp head is inserted into the connecting cap from the fourth end face of the connecting cap to be movably mounted in the connecting cap;

[0023] A convex head is arranged on the clamp head, and the convex head comprises an upper taper surface and a lower taper surface.

[0024] Further, an inner thread is arranged on an inner wall of the connecting cap for matched connection with an outer thread of the pipe;

[0025] A pressing taper surface matched with the upper taper surface is arranged in the connecting cap, and the upper taper surface can be attached to the pressing taper surface during the gathering of the clamp claw under stress;

[0026] A limiting cavity is arranged between the pressing taper surface and the fourth end face, and the limiting cavity is used for limiting the movement of the clamp claw to the fourth end face.

[0027] Further, the pressing taper surface is an inclined surface, wherein, taking the fourth end face as a horizontal reference surface, an included angle between the pressing taper surface and an axial direction of the first end face is a first included angle, and 0°<θ1≤90°.

[0028] Further, the convex head is gathered inward when the upper taper surface is attached to the pressing taper surface;

[0029] Wherein, in this state, taking the first end face as a horizontal reference surface,

[0030] An included angle between the upper taper surface and the axial direction of the first end face is a fourth included angle, and θ4=θ1;

[0031] The metal card rotates with the gathering of the convex head, an included angle between the metal card and the first end face is a fifth included angle, θ5=θ3+(θ2-θ1), and 0°<θ5<90°.

[0032] Further, when the upper taper surface is attached to the inside of the limiting cavity, the convex head is gathered inward;

[0033] Wherein, in this state, the first end surface is taken as a horizontal reference surface,

[0034] The included angle between the upper taper surface and the axial direction of the first end surface is a sixth included angle θ6=0°;

[0035] The metal card rotates with the gathering of the convex head, and the included angle between the metal card and the first end surface is a seventh included angle θ7=θ3+θ2, and 0°<θ7<90°.

[0036] Further, the cross section of the convex head along the axial parallel surface of the first end surface is a triangle, the length of the upper taper surface is L1, and the length of the inner wall of the convex head is L2;

[0037] The metal card is arranged on the inner wall of the convex head, and the height of the arrangement is L3, L3=L1·cosθ2, and L2>L3>0.

[0038] It should be noted that when the claw is in a relaxed state,

[0039] The first included angle is 0°<θ1≤90°;

[0040] The second included angle is 0°<θ2<90°;

[0041] The third included angle is 0°<θ3<90°;

[0042] Wherein, θ2-θ1≥0;

[0043] The length of the upper taper surface is L1, L1>0;

[0044] The length of the inner wall of the convex head is L2, L2>L3>0;

[0045] The first end surface is taken as a horizontal reference surface, the axial direction of the first end surface is taken as a vertical direction, the height of the metal card connected with the elastic sheet is L3, L3=L1·cosθ2, and L2>L3>0.

[0046] In some embodiments, when the upper taper surface of the claw is attached to the pressing taper surface,

[0047] The fourth included angle is θ4=θ1;

[0048] The fifth included angle is θ5=θ3+(θ2-θ1), and 0°<θ5<90°,

[0049] The included angle of the arrangement of the metal card is 0°<θ3<90°-(θ2-θ1);

[0050] The length of the metal card convex spring is L4,

[0051] L4>(L2-L3)·sin(θ2-θ1), that is, L4>(L2-L1·cosθ2)·sin(θ2-θ1);

[0052] In some embodiments, when the upper taper surface is in close contact with the inner wall of the limiting cavity,

[0053] The sixth included angle is θ6=0°

[0054] The seventh included angle is θ7=θ3+θ2, and 0°<θ7<90°;

[0055] The included angle of the metal card is θ3, that is, 0°<θ3<90°-θ2;

[0056] The length of the metal card convex spring is L5,

[0057] L5>(L2-L3)·sinθ2, that is, L5>(L2-L1·cosθ2)·sinθ2;

[0058] The application discloses a clamp head and a joint. The length of the metal card and the included angle of the metal card are set on the clamp head. When the pipe inserted into the joint has a tendency to fall out of the joint, the clamp head is gathered to the pipe and tightly holds the pipe by cooperation of the clamp head and the connecting cap. When the clamp jaw is deflected, the metal card can still act on the pipe to clamp the pipe and prevent the pipe from falling out of the joint. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 It is an explosion schematic view of the clamp head and the joint of the application;

[0060] Figure 2 It is a schematic view of a connecting cap of the clamp head and the joint of the application;

[0061] Figure 2-1 It is a schematic view of the clamp head and the joint of the application; Figure 2 It is an enlarged view of part A of the clamp head and the joint of the application;

[0062] Figure 3 It is a schematic view of an embodiment one of cooperation of the clamp head and the connecting cap of the clamp head and the joint of the application;

[0063] Figure 4 It is a schematic view of an embodiment two of cooperation of the clamp head and the connecting cap of the clamp head and the joint of the application;

[0064] Figure 5 It is a top view of a relaxed state of the clamp head of the clamp head and the joint of the application;

[0065] Figure 6 is a top view of an embodiment one of a card head of a card head and joint of the present application;

[0066] Figure 7 is a top view of an embodiment two of a card head of a card head and joint of the present application;

[0067] Figure 8 is a schematic view of a metal card of a card head and joint of the present application in a card head relaxed state;

[0068] Figure 8-1 is a schematic view of a card head and joint of the present application; Figure 8

[0069] Figure 8-2 is a schematic view of a card head and joint of the present application; Figure 8

[0070] Figure 9 is a schematic view of a metal card of a card head and joint of the present application in an embodiment one of a card head;

[0071] Figure 9-1 is a schematic view of a card head and joint of the present application; Figure 9

[0072] Figure 9-2 is a schematic view of a card head and joint of the present application; Figure 9

[0073] Figure 10 is a schematic view of a metal card of a card head and joint of the present application in an embodiment two of a card head;

[0074] Figure 10-1 is a schematic view of a card head and joint of the present application; Figure 10

[0075] Figure 10-2 is a schematic view of a card head and joint of the present application; Figure 10

[0076] Figure 11 is a schematic view of a gland of a card head and joint of the present application.

[0077] Reference numerals:

[0078] ​​​​​​1, joint; 2, connecting pipe; 3, connecting cap; 4, clamp; 21, sealing ring; 22, gland; 221, top conical surface; 31, first connecting part; 32, second connecting part; 33, limiting cavity; 34, third end surface; 35, fourth end surface; 321, pressing conical surface; 41, clamping jaw; 42, base; 43, first end surface; 44, second end surface; 411, spring plate; 412, metal card; 421, limiting groove; 4111, protrusion; 4112, upper conical surface; 4113, lower conical surface. DETAILED DESCRIPTION

[0079] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present disclosure and do not limit the present disclosure.

[0080] In the description of the present application, if the first, second, etc. are described for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implying the number of technical features indicated or the order of technical features indicated.

[0081] Those skilled in the art should understand that in the disclosure of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as limiting the present application.

[0082] The present application will be further described in detail below in combination with the drawings, see Figures 1 to 11 Description.

[0083] A clamp head 4 and a joint 1, the joint 1 is provided with a cavity for inserting a pipe, the clamp head 4 is movably installed in the joint 1, the clamp head 4 is used for clamping the pipe inserted into the joint 1, so as to realize the connection between the joint 1 and the pipe. The clamp head 4 comprises a clamp jaw 41, the clamp jaw 41 has a certain elasticity, when being pressed, the clamp jaw 41 can tightly hold the pipe at the center of the clamp jaw 41, the clamp jaw 41 is provided with a protruding metal card 412, when the clamp jaw 41 is in a relaxed state, the metal card 412 can be in contact with the inserted pipe and can clamp the pipe compared with the clamp jaw 41; when the clamp jaw 41 is in a tightened state, the clamp jaw 41 is gathered to the center of the clamp head 4, the clamp jaw 41 drives the metal card 412 to deflect, the metal card 412 can still clamp the inserted pipe compared with the clamp jaw 41.

[0084] The joint 1 comprises a pipe 2 and a connecting cap 3, both of which are cylindrical, the pipe 2 and the connecting cap 3 are connected through threads, the end of the pipe 2 is provided with external threads, the inner wall of the connecting cap 3 is provided with internal threads matched with the external threads of the pipe 2, the connecting cap 3 is "bowl"-shaped, one end connected with the pipe 2 is wide, and the other end is narrow, the narrow end is movably connected with the clamp head 4, the pipe is inserted into the joint 1 from the narrow end, and the pipe is connected with the joint 1 through the clamp head 4 clamping the pipe.

[0085] Preferably, the connecting cap 3 is provided with a third end face 34 and a fourth end face 35, the first end face 43 of the clamp head 4 is inserted into the connecting cap 3 from the fourth end face 35 of the connecting cap 3, so as to be movably installed in the connecting cap 3; the connecting cap 3 comprises a first connecting part 31, a second connecting part 32 and a limiting cavity 33, all of which are cylindrical.

[0086] The second connecting part 32 is connected between the first connecting part 31 and the limiting cavity 33, the first connecting part 31, the second connecting part 32 and the limiting cavity 33 are all provided with cavities for inserting the pipe, and the axes of the cavities are on the same straight line. By arranging three connecting parts, the function of the connecting cap 3 is better realized, that is, one end is connected with the pipe 2, the other end movably installs the clamp head 4, and the pipe is clamped in the joint 1 through the cooperation of the connecting cap 3 and the clamp head 4. The inner wall of the first connecting part 31 is provided with internal threads for connection, the second connecting part 32 is provided with a pressing conical surface 321 matched with the upper conical surface 4112, and the limiting cavity 33 is used for limiting the movement of the clamp jaw 41 to the fourth end face 35, the inner wall of the limiting cavity 33 is perpendicular to the first end face 43, and the limiting cavity 33 is used for inserting the clamp jaw 41. Among them, the first connecting part 31 connects the connecting cap 3 with the pipe 2, the second connecting part 32 buffers the difference between the first connecting part 31 and the limiting cavity 33, and the limiting cavity 33 cooperates with the clamp jaw 41 to clamp the pipe in the joint 1.

[0087] The sealing cavity is provided with a sealing ring 21 and a gland 22. The sealing ring 21 is arranged between the bottom of the sealing cavity and the gland 22. The tail end of the gland 22 extends out of the connector 2 and is used to cooperate with the top of the clamping jaw 41 to compress the clamping jaw 41.

[0088] The chuck 4 comprises a base 42 and a clamping jaw 41. The clamping jaw 41 is connected to the base 42 and is used to clamp a pipe inserted therein. The clamping jaw 41 is provided with elastic tabs 411. The number of the elastic tabs 411 is not less than one and the elastic tabs 411 are uniformly distributed on the clamping jaw 41. The inner wall of the elastic tab 411 is provided with a metal tab 412. The metal tab 412 protrudes from the elastic tab 411 and is in contact with the pipe inserted into the chuck 4 to produce a clamping effect on the pipe.

[0089] When the clamping jaw 41 is compressed by the connecting cap 3, the clamping jaw 41 is gathered towards the center of the clamping jaw 41. Due to the elasticity of the elastic tab 411, the metal tab 412 is deflected by a certain angle. At this time, the metal tab 412 is still in contact with the pipe and has a clamping effect on the pipe compared with the elastic tab 411.

[0090] Preferably, the base 42 of the clamping jaw 41 comprises a first end face 43 and a second end face 44. The clamping jaw 41 is connected to the first end face 43. The first end face 43 of the base 42 is provided with a circular annular limiting groove 421. The outer circle of the limiting groove 421 coincides with the outer circle of the first end face 43. The inner circle of the limiting groove 421 does not coincide with the inner circle of the first end face 43. The outer circle of the clamping jaw 41 coincides with the inner circle of the limiting groove 421. The inner circle of the clamping jaw 41 coincides with the inner circle of the first end face 43. The limiting groove 421 is used to limit the position of the chuck 4 in the pipe connector. After the clamping jaw 41 is gathered and inserted into the limiting cavity 33 of the connecting cap 3, the limiting groove 421 cooperates with the limiting cavity 33 of the connecting cap 3 to limit the clamping jaw 41 from easily falling out of the connecting cap 3.

[0091] Preferably, the elastic tab 411 comprises a protruding head 4111 provided with an upper taper surface 4112 and a lower taper surface 4113. The metal tab 412 is arranged at the junction of the upper taper surface 4112 and the lower taper surface 4113. When the upper taper surface 4112 is subjected to a force towards the center of the clamping jaw 41, the elastic tab 411 can gather the metal tab 412 towards the center of the clamping jaw 41.

[0092] Preferably, the tail end of the gland 22 is provided with a top taper surface 221 which cooperates with the lower taper surface 4113. When the connecting cap 3 provided with the clamping jaw 41 is connected to the connector 2, the top taper surface 221 of the gland 22 abuts against the lower taper surface 4113 of the clamping jaw 41, limiting the movement of the clamping jaw 41 towards the connector 2, and through the force of the top taper surface 221, the clamping jaw 41 is ensured to gather towards the center of the pipe fitting, and tightly embrace the pipe fitting.

[0093] Preferably, the pressing taper surface 321 in the second connecting portion 32 of the connecting cap 3 is inclined, and cooperates with the upper taper surface 4112 in the convex head 4111 to tightly embrace the pipe fitting in the connecting cap 3. It is to be noted that, taking the first end surface 43 as the horizontal reference surface, in the cross section along the axis of the first reference surface, when the clamping jaw 41 is in the relaxed state, the inner wall of the convex head 4111 and the upper taper surface 4112 and the lower taper surface 4113 form a triangle, wherein the inner wall surface is perpendicular to the first reference surface.

[0094] The working principle of the clamping jaw 41 tightly embracing the pipe fitting is that the pipe fitting is inserted into the connecting cap 3 provided with the clamping jaw 41, the connecting cap 3 is screwed onto the connector 2, and the gland 22 on the connector 2 abuts against the upper taper surface 4112 of the clamping jaw 41 through the pressing taper surface 321, pressing the clamping jaw 41 and limiting the movement of the clamping jaw 41 towards the connector 2; the upper taper surface 4112 of the clamping jaw 41 is pressed by the pressing taper surface 321, and is clamped towards the pipe fitting. The outer wall of the pipe fitting abuts against the inner wall of the clamping jaw 41, the metal clamping sheet 412 on the clamping jaw 41 protrudes from the spring sheet 411, contacts the pipe fitting and exerts a force on the pipe fitting to tightly embrace the pipe fitting. When the pipe fitting is to be separated from the connector 2, the force exerted by the clamping jaw 41 and the metal clamping sheet 412 on the pipe fitting needs to be overcome to separate the pipe fitting, and the pipe fitting exerts a force towards the outside of the connecting cap 3, and due to the abutment of the pipe fitting and the clamping jaw 41, the clamping jaw 41 is moved towards the outside of the connecting cap 3 during the separation process, at this time, the upper taper surface 4112 of the clamping jaw 41 gradually abuts against the pressing taper surface 321 of the connecting cap 3, and is deflected towards the pipe fitting, that is, the clamping jaw 41 is gathered inward under the action of the pressing taper surface 321, and further presses the pipe fitting to tightly embrace the pipe fitting, preventing the pipe fitting from falling off. The spring sheet 411 which has been deflected by a certain angle deflects the metal clamping sheet 412 thereon, and the top of the convex head 4111 deflects towards the center of the clamping jaw 41, and may cover the metal clamping sheet 412, so that the metal clamping sheet 412 cannot contact and tightly embrace the pipe fitting, at this time, the clamping force on the pipe fitting is reduced, which may cause the pipe fitting to fall off. One of the ideas of the present application is that the metal clamping sheet 412 can protrude from the spring sheet 411 and tightly embrace the pipe fitting under this condition, thereby enhancing the connection stability of the connector 1 to the pipe fitting.

[0095] It is to be noted that, when the clamping head 4 is installed into the connector 1, the first end surface 43, the second end surface 44, the third end surface 34 and the fourth end surface 35 are all parallel to each other.

[0096] The following will be described in more detail in conjunction with the embodiments.

[0097] Embodiment One

[0098] The reference surface of the following included angle is the horizontal reference surface of the first end surface 43. The parallel surface of the axis of the first end surface 43 is profiled, and all the included angles are the included angles with the axis of the first end surface 43 in the profile. The axis of the pipe fitting coincides with the axis of the first end surface 43, and thus the included angle with the pipe fitting is regarded as the included angle with the axis of the first end surface 43.

[0099] The included angle of the pressing conical surface 321 with the axis of the first end surface 43 is the first included angle. When the chuck 4 is in the relaxed state, the included angle of the upper conical surface 4112 of the lug 4111 of the claw 41 is the second included angle, and the included angle of the metal card 412 is the third included angle. Since the pressing conical surface 321 needs to give the upper conical surface 4112 a pressing action, the upper conical surface 4112 rotates towards the axis of the first end surface 43, and thus the angle of the first included angle needs to be smaller than the angle of the second included angle. Since the pipe fitting is separated from the outside, the claw 41 will be moved together with the pipe fitting, and the claw 41 will have a tendency to move from the second connecting part 32 to the limiting cavity 33, and the claw 41 will be gathered inward to tightly hold the pipe fitting, and thus the angles of the first included angle and the second included angle are both smaller than 90 degrees.

[0100] In order for the metal card 412 to act on the pipe fitting, the convex lug 4111 needs to be first contacted with the pipe fitting. The length of the upper conical surface 4112 is set as L1, the length of the inner wall of the lug 4111 is L2, the metal card 412 is connected to the lug 4111, and the connection height is L3.

[0101] In order for the pipe fitting to be separated from the claw 41, according to the principle of force action, the pipe fitting will be subjected to resistance in the opposite direction from the metal card 412. According to the force analysis, the metal card 412 needs to give the force in the direction of the pipe fitting, and in the case of not damaging the metal card 412 and the claw 41, the third included angle of the metal card 412 needs to be an acute angle to give the pipe fitting a relatively large resistance. Assuming that the force of the pipe fitting to be separated is F1, and the force of the metal card 412 along the metal card 412 is F2, i.e.,

[0102] F1=F2·cosθ3;

[0103] Therefore, it can be known that

[0104] The first included angle is 0°<θ1<90°;

[0105] The second included angle is 0°<θ2<90°;

[0106] The third included angle is 0°<θ3<90°;

[0107] wherein θ2-θ1≥0;

[0108] L1>0;

[0109] L2>L3>0;

[0110] L3=L1*cosθ2.

[0111] From the above, the second included angle is at least greater than the first included angle, in the case where the second included angle is equal to the first included angle, that is, the pressure given by the pressure cone surface 321 to the upper cone surface 4112 is not enough to make the clamping jaw 41 inwardly gather, so that the pipe can be clamped. And to further ensure the clamping effect of the joint 1 on the pipe, the second included angle is set to be greater than the first included angle, so that the pipe can still be clamped and prevented from falling off while ensuring that the clamping jaw 41 is driven by the pipe to be out of the connecting cap 3. When the deflection occurs, the protrusion 4111 drives the metal clamping piece 412 to rotate together, and the included angle of the metal clamping piece 412 relative to the pipe also changes. If it is required to ensure that the metal clamping piece 412 still acts on the pipe in this state, the included angle of the metal clamping piece 412 still needs to be an acute angle, and the protrusion 4111 needs to be set to be compared with the top of the protrusion 4111 to act on the pipe first. The length of the metal clamping piece 412 is set to be length four, the included angle of the upper cone surface 4112 after rotation is the fourth included angle, the upper cone surface 4112 after rotation is in contact with the pressure cone surface 321, the fourth included angle is equal to the first included angle, and the included angle of the metal clamping piece 412 after rotation is the fifth included angle, that is,

[0112] The fourth included angle is θ4=θ1;

[0113] The fifth included angle is θ5=θ3+(θ2-θ1), and 0°<θ5<90°;

[0114] L4>(L2-L3)·sin(θ2-θ1), that is, L4>(L2-L1*cosθ2)·sin(θ2-θ1);

[0115] Therefore, if it is required to ensure that the pipe drives the clamping head 4 to be out of the connecting cap 3, the joint 1 can overcome this tendency and still clamps the pipe to be stably connected in the clamping head 4, the difference between θ2-θ1 is set as Δθ, the length of the metal clamping piece 412 and the angle set on the clamping head 4 are,

[0116] L4>(L2-L1*cosθ2)·sinΔθ;

[0117] 0°<θ3<90°-Δθ.

[0118] Example two

[0119] The setting of the clamp head 4 in the relaxed state is the same as the matching embodiment of the connecting cap 3. After the upper taper surface 4112 of the clamping jaw 41 is matched with the pressing taper surface 321 of the connecting cap 3, the clamping force of the upper taper surface 4112 still cannot clamp the pipe in the joint 1, the pipe still has a tendency to move outwards from the connecting cap 3, and the upper taper surface 4112 of the clamping jaw 41 will slide out of the second connecting part 32 of the connecting cap 3 and slide to the limiting cavity 33, and the upper taper surface 4112 is matched with the inner wall of the limiting cavity 33, and this state still needs to ensure the force of the metal clamping piece 412 on the pipe, the included angle of the upper taper surface 4112 in this state is a sixth included angle, since the upper taper surface 4112 is matched with the inner wall of the limiting cavity 33, and the inner wall of the limiting cavity 33 is perpendicular to the first end surface 43, so the sixth included angle is 0; the included angle of the metal clamping piece 412 is a seventh included angle, the angle of the deflection of the metal clamping piece 412 is the angle of the second included angle, and the length of the metal clamping piece 412 is a length five, that is,

[0120] The sixth included angle is θ6=0°.

[0121] The seventh included angle is θ7=θ3+θ2, and 0°<θ7<90°.

[0122] L5>(L2-L3)·sinθ2, that is, L5>(L2-L1·cosθ2)·sinθ2.

[0123] In this state, the angle and length of the metal clamping piece 412 arranged on the convex head 4111 are,

[0124] L5>(L2-L1·cosθ2)·sinθ2.

[0125] 0°<θ3<90°-θ2.

[0126] It should be noted that the length of the metal clamping piece and the angle value arranged on the convex head falling within the above range can achieve the technical key points of the present application. In addition, due to process processing, actual operation and use, etc., the cross section of the convex head cannot be completely triangular, and it slightly deviates from the triangle in reality, and it needs to be applied in industry, and there will be some chamfer design suitable for use. In the present application, it is approximately equivalent to a triangle to facilitate calculation and clear explanation for understanding by those skilled in the art, which cannot be a limitation point of the present application.

[0127] The above is a specific description of the preferred embodiment of the present application, but the present application is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A clamping head, the clamping head (4) comprising a cylindrical base (42), the base (42) being connected to a cylindrical clamping claw (41), the clamping claw (41) being used to clamp a pipe fitting inserted into the clamping head (4); The claw (41) is provided with a spring piece (411), and there is at least one spring piece (411). When the spring piece (411) is subjected to a force toward the axis of the claw (41), the spring piece (411) can converge toward the center of the claw (41) to hold the pipe fitting inserted into the clamp head (4). characterized in that The spring (411) is provided with a metal card (412), which protrudes from the spring (411) and contacts the tube in the insertion head (4); The spring (411) includes a protrusion (4111), which has an upper conical surface (4112) and a lower conical surface (4113). The base (42) includes a first end face (43) and a second end face (44), and the claw (41) is connected to the first end face (43), with the first end face (43) as the horizontal reference plane; When the chuck (41) is in the relaxed state, the metal card (412) can contact the tube inserted into the chuck (4); the angle between the upper conical surface (4112) and the axial direction of the first end face (43) is the second angle, 0°<θ2 <90°; the angle between the metal card (412) and the axial direction of the first end face (43) is the third angle, 0°<θ3 <90°; When the claw (41) is in a tightened state, on the vertical surface of the first end face (43), the metal card (412) can extend beyond the top of the spring piece (411) and contact the pipe inserted into the card head (4) and act on the pipe to clamp the pipe; the angle range of the metal card (412) set on the protrusion (4111) is 0°<θ3<90°-θ2.

2. A card head according to claim 1, characterized in that, The metal card (412) is disposed on the inner wall of the protrusion (4111), and the metal card (412) protrudes from the line of intersection between the parallel plane where the two conical surfaces of the protrusion (4111) meet and the inner wall of the protrusion (4111). When the upper conical surface (4112) is subjected to a force toward the axis of the claw (41), the spring piece (411) can drive the metal card (412) to converge toward the center of the claw (41).

3. A clamp according to claim 1, wherein The first end face (43) is provided with an annular limiting groove (421). The outer ring of the limiting groove (421) coincides with the outer ring of the first end face (43). The inner ring radius of the limiting groove (421) is larger than the inner ring radius of the first end face (43). The limiting groove (421) is used to limit the position of the clamp (4) in the pipe connector. The outer ring of the claw (41) coincides with the inner ring of the limiting groove (421), and the inner ring of the claw (41) coincides with the inner ring of the first end face (43).

4. A joint, characterized by The joint (1) comprises a connector (2) and a connecting cap (3), and the connector (2) is connected with the connecting cap (3) through threads; The clamping head (4) is movably installed in the joint (1) to clamp a pipe inserted into the connecting cap (3); The connecting cap (3) is provided with a third end face (34) and a fourth end face (35), and the first end face (43) of the clamping head (4) is inserted into the connecting cap (3) from the fourth end face (35) of the connecting cap (3) to be movably installed in the connecting cap (3); The clamping head (4) is provided with a protrusion (4111), and the protrusion (4111) comprises an upper taper surface (4112) and a lower taper surface (4113); The connecting cap (3) is provided with a pressing taper surface (321) matched with the upper taper surface (4112), and a limiting cavity (33) is arranged between the pressing taper surface (321) and the fourth end face (35); Taking the fourth end face (35) as a horizontal reference surface, an included angle between the pressing taper surface (321) and an axial direction of the first end face (43) is a first included angle, 0° < θ1 ≤ 90°, and θ2-θ1 ≥ 0; A length of the upper taper surface (4112) is L1, and an inner wall length of the protrusion (4111) is L2; The metal card (412) is arranged on the inner wall of the protrusion (4111), a height of the metal card (412) is L3, L3 = L1 ∙ cos θ2, and L2 > L3 > 0; when the upper taper surface (4112) is attached to the pressing taper surface (321), a length of the metal card (412) is L4, L4 > (L2-L3) ∙ sin(θ2-θ1), that is, L4 > 23 (L2-L1 ∙ cos θ2) ∙ sin(θ2-θ1); An angle range of the metal card (412) arranged on the protrusion (4111) is 0° < θ3 < 90°-(θ2-θ1); when the upper taper surface (4112) is attached to the limiting cavity (33), a length of the metal card (412) is L5, L5 > (L2-L3) ∙ sin θ2, that is, L5 > (L2-L1 ∙ cos θ2) ∙ sin θ2.

5. A fitting according to claim 4, wherein An inner thread is arranged on an inner wall of the connecting cap (3) to be matched and connected with an outer thread of the connector (2); During a force gathering process of the clamping claw (41), the upper taper surface (4112) can be attached to the pressing taper surface (321); The limiting cavity (33) is used for limiting movement of the clamping claw (41) to the fourth end face (35).

6. A fitting according to claim 5, wherein The pressing taper surface (321) is an inclined surface.

7. A fitting according to claim 6, wherein When the upper taper surface (4112) is attached to the pressing taper surface (321), the protrusion (4111) is inwardly gathered; In this state, taking the first end face (43) as a horizontal reference surface, An included angle between the upper taper surface (4112) and an axial direction of the first end face (43) is a fourth included angle, θ4 = θ1. The metal card (412) rotates with the convergence of the convex head (4111), the angle between the metal card (412) and the first end surface (43) is a fifth angle, θ5=θ3+(θ2-θ1), and 0°<θ5<90°.

8. A fitting according to claim 6, wherein When the upper conical surface (4112) is attached to the inside of the limiting cavity (33), the convex head (4111) converges inwardly; Wherein, in this state, the first end surface (43) is a horizontal reference surface, The angle between the upper conical surface (4112) and the axis direction of the first end surface (43) is a sixth angle, θ6=0°; The metal card (412) rotates with the convergence of the convex head (4111), the angle between the metal card (412) and the first end surface (43) is a seventh angle, θ7= θ3+θ2, and 0°<θ7<90°.

9. A joint according to any one of claims 7 or 8, characterised in that, The cross section of the convex head (4111) along the axis parallel surface of the first end surface (43) is a triangle.

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