Threaded connection device and connection terminal
By providing a protective plate and a fixing arm in the threaded connection device, the force distribution on the current strip is reduced, and the problem of the current strip easily deformed or pierced by clamping screws in the prior art is solved, thereby improving the stability of the threaded connection device.
Patent Information
- Application Number
- CN202380073616.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-10-20
- Filing Date
- 2023-10-13
- Publication Date
- 2025-05-30
AI Technical Summary
Existing threaded connection devices tend to cause the current strip to deform or be pierced by the clamping screw under high clamping force, resulting in stability problems.
A protective plate is provided between the clamping screw and the current bar, and the protective plate is maintained on the current bar through the fixing arm, thereby reducing the force acting on the current bar and avoiding point load.
By reducing the force distribution on the current strip, deformation of the current strip and puncture of the clamping screws are avoided, and the stability of the entire threaded connection device is improved.
Smart Images
Figure CN120077527A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a threaded connection device for connecting electrical conductors, which has a clamping screw, a clamping sleeve body with a receiving cavity, and a current bar. The current bar is introduced into the receiving cavity, and the conductor to be connected can be clamped relative to the current bar by means of the clamping screw (110). The present invention also relates to a connection terminal having at least one such threaded connection device. Background Art
[0002] Such threaded connection devices are used, for example, in electrical connection terminals such as junction boxes, circuit board connection terminals, or terminal posts. The electrical connection terminal with a threaded connection is characterized by a high clamping force that can be constantly transmitted to the electrical conductor over the years. This type of clamping can maintain a predetermined high clamping force without fluctuations even when vibrations act on the electrical connection terminal. Due to these characteristics, electrical connection terminals with threaded connections are preferably also used in high - demand industrial applications with moving and vibrating machine components.
[0003] Such threaded connection devices usually have a current bar that is inserted into the receiving cavity of the clamping sleeve body, and the conductor to be connected is clamped to the current bar in the connected state. The current bar is usually made of copper material, which has good electrical conductivity, especially good current conductivity. However, the copper material has low mechanical strength, so that it can be easily deformed or even penetrated by the action of force, for example, by the force of the clamping screw. Summary of the Invention
[0004] Therefore, the object of the present invention is to provide a threaded connection device, which is characterized by improved functionality, especially improved stability.
[0005] According to the present invention, this object is achieved by the features of the independent claims. Advantageous designs and advantageous improvements of the present invention are given in the dependent claims.
[0006] The threaded connection device according to the present invention is characterized in that a protection plate is provided between the clamping screw and the current bar. The protection plate is fixed to the current bar, and a first fixing arm is provided on the first longitudinal edge surface of the protection plate, and a second fixing arm is provided on the second longitudinal edge surface of the protection plate opposite to the first longitudinal edge surface of the protection plate for holding the protection plate on the current bar.
[0007] According to the provisions of the present invention, the threaded connection device additionally has a protective plate which can withstand the force exerted on the current bar by the clamping screw during connection of the conductor and is distributed on its surface, so that the force acting on the current bar itself, especially the force per unit area, can be reduced. In particular, the point load acting on the current bar through the clamping screw can be avoided. Thereby, deformation of the current bar or even piercing of the current bar by the clamping screw acting thereon can be prevented. Thereby, the stability of the entire threaded connection device can be improved. By arranging the protective plate between the clamping screw and the current bar, direct contact between the current bar and the clamping screw can be avoided. The protective plate is preferably configured such that it abuts against the current bar in a planar manner, especially in the region where the clamping screw acts on the current bar. The current bar and the protective plate can be positioned or placed one above the other. Therefore, the current bar device with a protective plate can have a sandwich form. The protective plate is preferably inserted into the receiving cavity of the clamping sleeve body in exactly the same manner as the current bar. In order to enable non-sliding positioning of the protective plate on the current bar, the protective plate has two oppositely arranged fixing arms, and the protective plate is held on the current bar and thus fixed by these fixing arms. Therefore, the protective plate can at least partially surround the current bar, especially at least partially surround the current bar in terms of its width. These fixing arms are preferably configured to protrude respectively from one of the longitudinal edge surfaces of the protective plate and are bent into corresponding shapes. Each of these two fixing arms forms a kind of grasping arm.
[0008] Preferably, it is provided that the first fixing arm surrounds the first longitudinal edge surface of the current bar and / or the second fixing arm surrounds the second longitudinal edge surface of the current bar which is opposite to the first longitudinal edge surface. Therefore, the protective plate can at least partially surround the current bar, especially at least partially surround the current bar in terms of its width. These fixing arms are preferably configured to protrude respectively from one of the longitudinal edge surfaces of the protective plate and are bent into corresponding shapes. Therefore, each of the two fixing arms can form a kind of grasping arm.
[0009] In order to prevent the protective plate from sliding axially along the length of the current bar, a first stop edge for the first fixing arm can be formed on the first longitudinal edge surface of the current bar, and / or a second stop edge for the second fixing arm can be formed on the second longitudinal edge surface of the current bar. The stop edge on the first longitudinal edge surface and / or the stop edge on the second longitudinal edge surface can protrude respectively from their respective longitudinal edge surfaces. In order to form the stop edge, tab-shaped protrusions can be respectively formed on the respective longitudinal edge surfaces of the current bar.
[0010] In order to reliably hold the protective plate on the current bar by means of these fixing arms, the first fixing arm can be formed to be bent into a C shape and / or the second fixing arm can be formed to be bent into a C shape.
[0011] The first fixing arm may have a free end, and the second fixing arm may have a free end. The two free ends of these fixing arms may face each other. The two fixing arms may be constructed to be so long that the free ends of the fixing arms are arranged adjacent to each other. Here, a gap may be formed between the free end of the first fixing arm and the free end of the second fixing arm. In addition, the fixing arms may also be constructed to be so long that the free end of the first fixing arm may abut against the free end of the second fixing arm. In this design of the fixing arms, the protective plate may surround the current bar on the entire outer peripheral surface of the current bar. Therefore, in the region of the fixing arms, the protective plate may surround the current bar annularly.
[0012] In order to hold the protective plate on the current bar, the protective plate may also have a fixing tab extending in the longitudinal direction of the protective plate, and the fixing tab may surround an end section of the current bar. The fixing tab may extend away from the two fixing arms at a 90° angle. The fixing tab may be constructed such that the fixing tab tapers in the direction of the end section of the current bar along its length. The fixing tab may surround and clamp the end section of the current bar. The axial sliding of the protective plate along the length of the current bar can be prevented by the fixing tab.
[0013] Preferably, the current bar is made of a first material, and the protective plate is made of a second material different from the first material. Therefore, the current bar and the protective plate are preferably made of different materials, so that the protective plate has material properties different from those of the current bar.
[0014] Particularly preferably, the second material has a higher mechanical strength than the first material. Thus, the protective plate with higher strength and thus higher stability compared to the current bar can particularly well protect the current bar from being deformed and / or penetrated by the clamping screw.
[0015] The first material of the current bar may preferably be made of a copper material. The copper material has particularly good electrical conductivity.
[0016] The second material of the protective plate may preferably be made of a steel material. The steel material is characterized by high hardness or mechanical strength, but its electrical conductivity is poor.
[0017] In addition, a solution for achieving the object of the present invention is realized by means of a connection terminal, which has a housing and at least one threaded connection device arranged in the housing and constructed and improved as described above. Such a connection terminal may be, for example, a circuit board connection terminal, but may also be a junction box. Description of the Drawings
[0018] The present invention will be described in detail below with reference to the drawings according to preferred embodiments. Among them,
[0019] Figure 1 A schematic diagram of the threaded connection device according to the present invention is shown.
[0020] Figure 2 shows a schematic cross-sectional view of the threaded connection device shown in Figure 1 , and a protective plate shown in
[0021] Figure 3 shows a schematic view of the protective plate shown in Figure 1 .
[0022] Figure 4 shows another schematic view of the protective plate shown in Figure 3 .
[0023] Figure 5 shows Figure 1 a schematic view of the current bar shown together with the protective plate arranged thereon.
[0024] Figure 6 shows a schematic view of another design of the protective plate.
[0025] Figure 7 shows Figure 6 another schematic view of the protective plate shown in
[0026] Figure 8 shows Figure 6 a schematic view of the protective plate arranged on the current bar shown in
[0027] Figure 9 shows a connection device having Figure 6 the protective plate shown in
[0028] Figure 10 shows Figure 9 another schematic view of the connection device shown in
[0029] Figure 11 and shows a schematic view of another design of the protective plate. DETAILED DESCRIPTION
[0030] Figure 1 and 2 show a threaded connection device 100 for connecting electrical conductors (not shown here).
[0031] The threaded connection device 100 has a clamping screw 110, a clamping sleeve body 111, a current bar 112, and a protective plate 113 held on the current bar 112.
[0032] The clamping sleeve body 111 has a receiving cavity 130 into which the conductor to be connected can be inserted and in which the conductor to be connected can be connected by clamping the current bar 112 relative to the conductor inserted into the receiving cavity 130 by means of the clamping screw 110.
[0033] The clamping sleeve body 111 is here constructed of a milled metallic material. However, the clamping sleeve body 111 can also be constructed of a folded metallic material. The clamping sleeve body 111 has two side walls 114, 115 arranged opposite to each other, a bottom wall 116 and a top wall 117. The receiving cavity 130 is surrounded by the two side walls 114, 115, the bottom wall 116 and the top wall 117. A threaded hole 118 is provided in the top wall 117, in which the clamping screw 110 is guided and held.
[0034] The protective plate 113 is arranged between the clamping screw 110 and the current bar 112 such that the clamping screw 110 does not act directly on the current bar 112, but acts on the current bar 112 via the protective plate 113. The protective plate 113 is a component independent of the current bar 112, which component can be assembled on the current bar 112. Thus, the protective plate 113 can be retrofitted. The protective plate 113 and the current bar 112 are inserted together into the receiving cavity 130.
[0035] The current bar 112 is constructed of a first material. The first material is here a copper material. The protective plate 113 is constructed of a second material. The second material is here a steel material. Through this different material selection, the current bar 112 made of copper material has particularly good electrical conductivity and thus particularly good current conduction. In contrast, the protective plate 113 made of steel material does not have good electrical conductivity, but the protective plate 113 has high mechanical strength and thus high mechanical stability in order to be able to withstand the compressive load of the clamping screw 110.
[0036] In Figure 3 and Figure 4 are shown separately the protective plate 113 shown in Figure 1 and Figure 2 The protective plate 113 has a base body 119 extending parallel to the current bar 112. As shown in Figure 2 and Figure 5 the protective plate 113 is placed flat on the upper side 120 of the current bar 112 by means of the base body 119. The upper side 120 of the current bar 112 points in the direction of the clamping screw 110. In the clamped state, the current bar 112 can bear against the connected conductor by means of the lower side 128 of the current bar 112.
[0037] Two fixing arms 121A and 121B are formed on the base body 119. The first fixing arm 121A is arranged on the first longitudinal edge surface 122A of the protection plate 113 or the base body 119, and the second fixing arm 121B is arranged on the second longitudinal edge surface 122B of the protection plate 113 or the base body 119 which is opposite to the first longitudinal edge surface 122A. The two fixing arms 121A and 121B are bent out from the plane of the base body 119 respectively, so that the first fixing arm 121A surrounds the first longitudinal edge surface 123A of the current bar 112, and the second fixing arm 121B surrounds the second longitudinal edge surface 123B of the current bar 112. The two fixing arms 121A and 121B extend from the upper side 120 of the current bar 112 until the lower side 128 of the current bar 112.
[0038] In order to prevent the protection plate 113 from axially sliding along the length of the current bar 112, a first stop edge 124A for the first fixing arm 121A is formed on the first longitudinal edge surface 123A of the current bar 112, and a second stop edge 124B for the second fixing arm 121B is formed on the second longitudinal edge surface 123B of the current bar 112. The stop edge 124A on the first longitudinal edge surface 123A and the stop edge 124B on the second longitudinal edge surface 123B protrude from the corresponding longitudinal edge surfaces 123A and 123B of the current bar 112 respectively. In order to form the stop edges 124A and 124B, tab-shaped protrusions 125A and 125B are respectively formed on the corresponding longitudinal edge surfaces 123A and 123B of the current bar 112. Through the two protrusions 125A and 125B, the current bar 112 has an increased width at this position. The two fixing arms 121A and 121B abut against the corresponding stop edges 124A and 124B.
[0039] In addition to the two fixing arms 121A and 121B, the protection plate 113 shown here has a fixing tab 126 extending in the longitudinal direction of the protection plate 113, and the fixing tab surrounds the end section 127 of the current bar 112. The fixing tab 126 extends away from the base body 119 of the protection plate 113 at an angle of 90° rotation relative to the two fixing arms 121A and 121B. The fixing tab 126 tapers gradually along its length starting from the base body 119. The fixing tab 126 surrounds and clamps the end section 127 of the current bar 112. As can be seen in Figure 5 it is possible to prevent the protection plate 113 from axially sliding along the length of the current bar 112 through the fixing tab 126 and the two stop edges 124A and 124B of the current bar 112 or the two fixing arms 121A and 121B of the protection plate 113 that abut against the stop edges 124A and 124B.
[0040] In Figure 6 and7 Another possible design of the protection plate 113 is shown. As opposed to the protection plate 113 shown in Figures 1 to 5 , this protection plate does not have the fixing tabs 126. The two fixing arms 121A, 121B are also formed shorter here on two longitudinal edge surfaces 122A, 122B of the protection plate 113 or the base body 119.
[0041] As Figure 7 shown, both of the two fixing arms 121A, 121B are configured to be C-shaped bent so as to surround the longitudinal edge surfaces 123A, 123B of the current bar 112.
[0042] As visible in Figure 8 , here, the current bar 112 also has stop edges 124A, 124B for the fixing arms 121A, 121B so as to prevent the protection plate 113 from axially sliding along the length of the current bar 112. In order to form the stop edges 124A, 124B, tab-shaped protrusions 125A, 125B are respectively formed on the corresponding longitudinal edge surfaces 123A, 123B of the current bar 112. Due to the two protrusions 125A, 125B, the current bar 112 has an increased width at this position.
[0043] Figure 9 And Figure 10 show a connecting device 100 having the protection plate 113 and the current bar 112, as Figures 6 to 8 shown. In other aspects, Figure 9 and Figure 10 the connecting device 100 shown corresponds to the connecting device shown in Figure 1 and Figure 2 .
[0044] Figure 11 shows another possible design of the protection plate 113, which is similar to the design shown in Figure 6 and 7 . However, in the design shown in Figure 11 , the lengths of the fixing arms 121A, 121B of the protection plate 113 are respectively formed such that the free end 129A of the first fixing arm 121A abuts against the free end 129B of the second fixing arm 121B. In this design, the protection plate 113 surrounds the current bar 112 on the entire outer peripheral surface of the current bar. Therefore, in the region of the fixing arms 121A, 121B, the protection plate 113 can annularly surround the current bar 112.
[0045] Description of reference numerals
[0046] 100 Threaded connection device
[0047] 110 Clamping screw
[0048] 111 Clamping sleeve body
[0049] 112 Current bar
[0050] 113 Protection plate
[0051] 114 First side wall
[0052] 115 Second side wall
[0053] 116 Bottom wall
[0054] 117 Top wall
[0055] 118 Threaded hole
[0056] 119 Substrate
[0057] 120 Upper side
[0058] 121A, 121B Fixed arms
[0059] 122A, 122B Longitudinal edge surfaces
[0060] 123A, 123B Longitudinal edge surfaces
[0061] 124A, 124B Stop edges
[0062] 125A, 125B Protrusions
[0063] 126 Fixed tab
[0064] 127 End section
[0065] 128 Lower side
[0066] 129A, 129B Free ends
[0067] 130 Receiving cavity
Claims
1. A threaded connection device (100) for connecting electrical conductors, comprising a clamping screw (110), a clamping sleeve body (111) having a receiving cavity (130), and a current bar (112) inserted into the receiving cavity (130), and the conductor to be connected can be clamped to the current bar by means of the clamping screw (110), characterized in that a protective plate (113) is provided between the clamping screw (110) and the current bar (112), wherein the protective plate (113) is fixed to the current bar (112), and a first fixing arm (121A) is provided on a first longitudinal edge surface (122A) of the protective plate (113), and a second fixing arm (121B) is provided on a second longitudinal edge surface (122B) of the protective plate (113) opposite to the first longitudinal edge surface (122A) of the protective plate (113) to hold the protective plate (113) on the current bar (112).
2. The threaded connection device (100) according to claim 1, characterized in that the first fixing arm (121A) surrounds a first longitudinal edge surface (123A) of the current bar (112), and / or the second fixing arm (121B) surrounds a second longitudinal edge surface (123B) of the current bar (112) opposite to the first longitudinal edge surface (123A).
3. The threaded connection device (100) according to claim 2, characterized in that a first stop edge (124A) for the first fixing arm (121A) is formed on the first longitudinal edge surface (123A) of the current bar (112), and / or a second stop edge (124B) for the second fixing arm (121B) is formed on the second longitudinal edge surface (123B) of the current bar (112).
4. The threaded connection device (100) according to any one of claims 1 to 3, characterized in that the first fixing arm (121A) is formed in a C-shaped bend, and / or the second fixing arm (121B) is formed in a C-shaped bend.
5. The threaded connection device (100) according to any one of claims 1 to 4, characterized in that the first fixing arm (121A) has a free end (129A), and the second fixing arm (121B) has a free end (129B), wherein the free end (129A) of the first fixing arm (121A) abuts against the free end (129B) of the second fixing arm (121B).
6. The threaded connection device (100) according to any one of claims 1 to 5, characterized in that the protective plate (113) has a fixing tab (126) extending along the longitudinal direction of the protective plate (113), and the fixing tab surrounds an end section (127) of the current bar (112).
7. The threaded connection device (100) according to any one of claims 1 to 6, characterized in that The current bar (112) is made of a first material, and the protection plate (113) is made of a second material different from the first material.
8. The threaded connection device (100) according to claim 7, wherein, the second material has a higher mechanical strength than the first material.
9. The threaded connection device (100) according to claim 7 or 8, wherein, the second material is made of a steel material.
10. A connection terminal having a housing and at least one threaded connection device (100) disposed in the housing, the threaded connection device being constructed according to any one of claims 1 to 9.