Ring groove rivet connection pair for narrow space, installation tool and riveting method

Abstract

The present invention discloses a ring groove rivet connection pair, installation tool and riveting method for narrow spaces. The connection pair includes a rivet, a collar and a movable forming anvil; the collar and the anvil have mutually matching conical surface structures; the riveting tool is composed of a gun body, a fixed riveting arm, a rivet positioning groove, a movable riveting arm and anvil positioning groove; the riveting method includes the steps of installation, extrusion and riveting and fixing, and the anvil and the collar are tightly fitted and fixed after riveting. The connection pair structure of the present invention is simple and has no tail force structure. The inclined outer wall design of the collar and the anvil is more convenient for demolding during upsetting and forging, and positioning and alignment are easier; the anvil is a disposable accessory and has lower cost; the riveting tool has two riveting arm structures, which can be used at any angle to facilitate installation operations. One riveting arm has a rivet positioning groove to realize rivet tail positioning, and the other riveting arm is provided with an anvil positioning groove to realize the positioning force of the anvil. The positioning and riveting installation of the rivet are achieved by matching the two riveting arms.

Description

Technical Field

[0001] The present invention belongs to the field of riveting technology, in particular to the field of design, manufacture and application of a riveting fastener, a special installation tool and a riveting method for connecting in a narrow space, and belongs to the riveting category (B21J) and fastener category (F16B) of metal machining. Background Art

[0002] There are many types of ring groove rivets, which are widely used in rail transportation, aerospace, new energy, automobiles, steel structures and other fields, solving the problem of loosening and failure of fasteners under vibration conditions. Since the installation principle of ring groove rivets is based on the principle of metal plastic deformation according to Hooke's law, special installation tools with certain dimensions must be used during installation. Figure 1 and Figure 2 As shown, to ensure smooth installation, the single-side installation space L of the connected part usually needs to be larger than the sum of the exposed length a of the rivet tail, the gap b between the riveting tool and the rivet tail, and the length c of the riveting tool L1. If the actual installation space L is smaller than L1, the ring groove rivet installation cannot be completed. Summary of the Invention

[0003] In response to the shortcomings of the prior art, the present invention discloses a ring groove rivet connection pair, installation tool, and riveting method for use in narrow spaces. The present invention aims to provide a ring groove rivet and riveting tool structure for use in narrow spaces, thereby ensuring the installation of ring groove rivets in narrow spaces and further expanding the application range of ring groove rivet products.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention first discloses a ring groove rivet connection pair for narrow space. The connection pair includes a rivet and a collar, and is characterized in that it also includes a movable forming anvil;

[0006] The rivet is composed of a head, a polished rod and a ring groove arranged in sequence on a cylindrical rod;

[0007] The collar is composed of a flange and a deformation zone arranged on a cylindrical structure, and the outer shape of the collar deformation zone is a trapezoidal frustum structure with a conical surface of 1° to 30°;

[0008] The movable forming anvil is matched one by one with the collar and is used for extruding and tightening the collar. The movable forming anvil is a cylindrical tube structure, the outer shape of which has a structure matching the positioning groove of the riveting tool anvil, and the inner hole has an inner trapezoidal cone hole matching the trapezoidal cone outer shape of the collar.

[0009] Furthermore, the protrusion has a semi-spherical, trapezoidal frustum, or variable-section frustum structure that matches the rivet positioning groove of the riveting tool.

[0010] The invention also discloses a riveting tool specially used for the connection pair.

[0011] The riveting tool consists of a gun body, a fixed riveting arm, a rivet positioning slot, a movable riveting arm, and an anvil positioning slot;

[0012] The fixed riveting arm is fixedly arranged on the gun head extrusion processing axis of the gun body, and the rivet positioning groove is provided along the axis on the opposite side surface of the fixed riveting arm and the movable riveting arm; the rivet positioning groove has a groove matching the shape of the head;

[0013] The movable riveting arm is an L-shaped structure, which is driven to extend and retract by a driving mechanism provided in the gun body. The inner surface of the gun head at the outer end of the movable riveting arm L is provided with an anvil positioning groove along the axis for detachably embedding and fixing the movable forming anvil.

[0014] The fixed riveting arm is rotatably fixed to the gun body through a sleeve, and the movable riveting arm is rotatably fixed to the gun body cylinder through a sleeve, and is used to rotate arbitrarily along the cylinder axis of the riveting tool according to the installation space.

[0015] The riveting method of the connection pair and the special riveting tool thereof of the present invention comprises the following steps:

[0016] Step 1: Insert the rivet into the connected parts. After all the connected parts are inserted, insert the collar into the rivet ring groove structure.

[0017] Step 2: Match the rivet positioning groove structure of the riveting arm of the special riveting tool with the rivet head, and place the movable forming anvil into the anvil positioning groove of the riveting arm countersunk structure to prepare for riveting;

[0018] Step 3: Start the riveting tool. Under the action of the riveting oil pressure, the movable riveting arms of the riveting tool move toward each other along the extrusion processing axis, and the movable forming anvil extrudes the collar to start riveting;

[0019] Step 4: The riveting tool oil pressure reaches the set value or the movable forming anvil is squeezed to the specified position and stops moving forward, and the riveting is completed;

[0020] Step 5: Under the action of the de-riveting oil pressure, the movable riveting arm returns to its initial position, and the forming anvil remains on the collar riveting fixation;

[0021] Step 6: Remove the riveting tool from the connected parts and the riveting operation is completed.

[0022] The benefits of the present invention:

[0023] 1. The ring groove rivet connection pair structure protected by the present invention is simpler, and the connection pair ring adopts an outer wall design with an inclination angle of 1° to 30°, which is more convenient for demoulding during upsetting.

[0024] 2. The rivet protected by the present invention has a simple structure and no tail force structure. After installation, the rivet will not be exposed from the end face of the collar, further reducing the size requirement of the installation space.

[0025] 3. During the batch riveting process, the inner wall of the forming anvil is designed with an inclination angle of 1° to 30°, which can ensure automatic matching and positioning with the ring during riveting, and has greater initial positioning flexibility.

[0026] 4. The forming anvil of the riveting tool described in this invention is designed as a movable structure, which can be automatically aligned according to the rivet status during installation, making it easier to rivet and install.

[0027] 5. The forming anvil of the riveting tool described in this invention is designed as a movable structure. After installation, it remains on the formed ring and is a disposable accessory. The material and performance requirements of the anvil can be greatly reduced, effectively reducing the cost of using the tool.

[0028] 6. The forming anvil of the riveting tool described in the invention is designed as a movable structure. After installation, it remains outside the formed ring. On the one hand, it can improve the mechanical properties of the ring groove rivet after installation. On the other hand, it does not require a large riveting force to withdraw the forming anvil, which is conducive to the lightweight and miniaturized design of the two riveting arms of the riveting tool and the realization of riveting operations in narrow spaces.

[0029] 7. The two riveting arms of the riveting tool of the present invention can be formed at any angle with the riveting tool handle according to the construction conditions, which is convenient for first-line installation operations.

[0030] 8. The riveting tool protected by the present invention has two riveting arm structures, one of which has a rivet positioning groove structure design, which can realize the positioning of the rivet tail, and the other riveting arm has a countersunk structure anvil positioning groove design, which can realize the positioning and force of the movable forming anvil. The two riveting arm structures can realize the installation of ring groove rivets in a narrow space.

[0031] 9. The riveting method of the present invention realizes the installation and construction of ring groove rivets in a narrow space through the special structure of the special riveting tool, thereby expanding the application range of ring groove rivet products. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the installation space dimensions of the connected parts;

[0033] Figure 2 This is a schematic diagram of the installation space requirements for conventional ring groove rivets;

[0034] Figure 3 This is a schematic diagram of the installation space of the special riveting tool of the present invention;

[0035] Figure 4 This is a schematic diagram of the ring groove rivet structure of the present invention;

[0036] Figure 5 It is a schematic diagram of the ring structure of the present invention;

[0037] Figure 6 This is a schematic diagram of the key structure of the special riveting tool of the present invention;

[0038] Figure 7-11 Schematic diagram of different riveting positions of the fixed riveting arm and the movable riveting arm of the riveting tool of the present invention;

[0039] Figures 12-18 The invention discloses a method for connecting pairs of riveting by using annular groove rivets in a narrow space.

[0040] In the figure, 1.1 is the protrusion, 1.2 is the polished rod, 1.3 is the ring groove, 2.1 is the flange, 2.2 is the deformation zone, 3.1 is the gun body, 3.2 is the fixed riveting arm, 3.3 is the rivet positioning groove, 3.4 is the movable forming anvil, 3.5 is the movable riveting arm, and 3.6 is the anvil positioning groove.

[0041] The installation riveting space is represented between A and B, L is the actual single-side installation space size of the connected part, a is the exposed length of the rivet tail after the conventional ring groove rivet is installed, b is the gap between the conventional riveting tool and the rivet tail when installed, c is the length size of the conventional riveting tool, L1 is the sum of a, b, and c, d is the exposed length of the rivet tail after the ring groove rivet is installed in the narrow space specified in the present invention, e is the gap between the rivet tail when installed with the riveting tool for the narrow space specified in the present invention, f is the external dimensions of the riveting arm two of the riveting tool for the narrow space specified in the present invention, and L2 is the sum of d, e, and f. DETAILED DESCRIPTION

[0042] The present invention is further described below in conjunction with specific embodiments. The specific embodiments are further explanations of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0043] Combined with the attached drawings.

[0044] The ring groove rivet connection pair for narrow space of the present invention comprises a rivet and a collar, and also comprises a movable forming anvil 3.4;

[0045] The rivet is composed of a head 1.1, a polished rod 1.2 and a ring groove 1.3 which are sequentially arranged on a cylindrical rod;

[0046] The collar is composed of a flange 2.1 arranged on a cylindrical structure and a deformation zone 2.2. The deformation zone 2.2 of the collar is a trapezoidal frustum structure with a conical surface of 1° to 30°.

[0047] The movable forming anvil 3.4 is matched with the ring one by one and is used for extrusion and tightening of the ring; the movable forming anvil 3.4 is a cylindrical tube structure, the outer shape of which has a structure matching the riveting tool anvil positioning groove 3.6, and the inner hole has an inner trapezoidal cone hole matching the outer trapezoidal cone of the ring deformation zone 2.2.

[0048] The head of the present invention has a semi-spherical, trapezoidal frustum, or variable-section frustum structure that matches the rivet positioning groove 3.3 of the riveting tool.

[0049] like Figure 2 As shown in the figure: L is the actual single-side installation space size of the connected part, a is the exposed length of the rivet tail after the conventional ring groove rivet is installed, b is the gap between the conventional riveting tool and the rivet tail when installed, c is the length size of the conventional riveting tool, L1 is the sum of a, b, and c, that is, the minimum size required for the conventional riveting tool operation.

[0050] like Figure 3 As shown in the figure: d is the exposed length of the rivet tail after the ring groove rivet is installed in the narrow space specified in the present invention, e is the gap between the rivet tail and the riveting tool for a narrow space specified in the present invention when installed, f is the external dimension of the riveting arm 2 of the riveting tool for a narrow space specified in the present invention, L2 is the sum of d, e, and f, that is, the minimum dimension required for the riveting tool for a narrow space specified in the present invention to operate.

[0051] like Figure 4 As shown, the rivet is composed of a head 1.1, a polished rod 1.2, and a ring groove 1.3 sequentially arranged on a cylindrical rod; wherein the head 1.1 can adopt different structural forms according to different working conditions, such as semi-spherical, trapezoidal frustum, variable cross-section frustum, etc.

[0052] like Figure 5 As shown, the collar comprises a flange 2.1 and a deformation zone 2.2; wherein, the collar adopts an outer wall design with an inclination angle of 1° to 30°, which is more convenient for demoulding during upsetting.

[0053] The length of the ring groove 1.3 of the ring groove rivet described in the present invention can be designed according to the actual connection thickness to ensure that the end face of the collar is not exposed after installation, which can further reduce the installation space requirement of the ring groove rivet connection pair.

[0054] The rivet and the collar of the present invention can be made of various materials such as carbon steel, stainless steel, and aluminum alloy.

[0055] like Figure 6 As shown, the special riveting tool for riveting of the present invention is composed of a gun body 3.1, a fixed riveting arm 3.2, a rivet positioning groove 3.3, a movable riveting arm 3.5, an anvil positioning groove 3.6 and other structures.

[0056] like Figures 7 to 11As shown, the fixed riveting arm 3.2 of the riveting tool of the present invention is rotatably secured to the gun body 3.1 via a sleeve (not shown); the movable riveting arm 3.5 is rotatably secured to the gun body cylinder via a sleeve (not shown). This structure allows the fixed riveting arm 3.2 and the movable riveting arm 3.5 to be freely rotated and adjusted along the axis of the riveting tool cylinder to meet installation space requirements and avoid interference between the gun body handle or riveting gun head and the mounting assembly.

[0057] Working principle: The fixed riveting arm 3.2 and the movable riveting arm 3.5 convert the direction of the riveting force of the cylinder axis of the conventional riveting tool into any direction relative to the riveting tool gun body, thus realizing riveting operations at multiple angles and in a small space.

[0058] The installation process of fastening and connecting using the rivets of the present invention and the special riveting tools is as follows:

[0059] Step 1: If Figure 12 As shown, the rivet is inserted into the connected parts, and after the connected parts are fully inserted, the collar is inserted into the rivet ring groove structure;

[0060] Step 2: If Figure 13 As shown, the movable forming anvil 3.4 is placed into the countersunk hole of the movable riveting arm 3.6 to prepare for riveting;

[0061] Step 3: If Figure 14 As shown, the riveting tool switch button is turned on, and the movable riveting arms 3.5 of the riveting tool move toward each other under the action of the riveting oil pressure, and riveting begins.

[0062] Step 4: If Figure 15 As shown, when the inner wall of the movable forming anvil 3.4 contacts the outer wall of the collar, the forming anvil 3.4 automatically aligns and positions according to the tapered angle of the inner wall and the tapered angle of the outer wall of the collar. Under the action of the riveting force, the collar 2 is squeezed by the movable forming anvil 3.4 and begins to deform.

[0063] Step 5: Figure 16 As shown, the riveting tool oil pressure reaches the set value or the movable forming anvil 3.4 is squeezed to the specified position and the movable forming anvil 3.4 no longer moves forward, and the riveting is completed;

[0064] Step 6: Figure 17 As shown, under the action of the de-riveting oil pressure, the movable riveting arm 3.5 returns to the initial position, the de-riveting is completed, and the movable forming anvil 3.4 remains on the collar;

[0065] Step 7: Figure 18 As shown, the riveting tool is removed from the connected parts and the riveting operation is completed.

Claims

1. A ring groove rivet connection pair for use in a narrow space, comprising a rivet and a collar, characterized in that: Also includes movable forming anvils; The rivet is composed of a head, a polished rod and a ring groove arranged in sequence on a cylindrical rod; The collar is composed of a flange and a deformation zone arranged on a cylindrical structure, and the outer shape of the collar deformation zone is a trapezoidal frustum structure with a conical surface of 1° to 30°; The movable forming anvil is matched one by one with the collar and is used for extruding and tightening the collar. The movable forming anvil is a cylindrical tube structure, the outer shape of which has a structure matching the positioning groove of the riveting tool anvil, and the inner hole has an inner trapezoidal cone hole matching the trapezoidal cone outer shape of the collar.

2. The ring groove rivet connection pair for narrow space according to claim 1, characterized in that: The protrusion has a semi-spherical, trapezoidal frustum, or variable-section frustum structure that matches the rivet positioning groove of the riveting tool.

3. A riveting tool for connecting ring groove rivets in narrow spaces, characterized by: For use in the connection pair according to claim 1 or 2, the riveting tool consists of a gun body, a fixed riveting arm, a rivet positioning slot, a movable riveting arm, and an anvil positioning slot; The fixed riveting arm is fixedly arranged on the gun head extrusion processing axis of the gun body, and the rivet positioning groove is provided along the axis on the opposite side surface of the fixed riveting arm and the movable riveting arm; the rivet positioning groove has a groove matching the shape of the head; The movable riveting arm is an L-shaped structure, which is driven to extend and retract by a driving mechanism provided in the gun body. The inner surface of the gun head at the outer end of the movable riveting arm L is provided with an anvil positioning groove along the axis for detachably embedding and fixing the movable forming anvil.

4. The riveting tool for the ring groove rivet connection pair for narrow space according to claim 3, characterized in that: The fixed riveting arm is rotatably fixed to the gun body through a sleeve, and the movable riveting arm is rotatably fixed to the gun body cylinder through a sleeve, and is used to rotate arbitrarily along the cylinder axis of the riveting tool according to the installation space.

5. A method for riveting a pair of ring groove rivets in a narrow space, characterized by: The riveting tool and the connecting pair according to claim 4 are used; the following steps are included: Step 1: Insert the rivet into the connected parts. After all the connected parts are inserted, insert the collar into the rivet ring groove structure. Step 2: Match the rivet positioning groove structure of the riveting arm of the special riveting tool with the rivet head, and place the movable forming anvil into the anvil positioning groove of the riveting arm countersunk structure to prepare for riveting; Step 3: Start the riveting tool. Under the action of the riveting oil pressure, the movable riveting arms of the riveting tool move toward each other along the extrusion processing axis, and the movable forming anvil extrudes the collar to start riveting; Step 4: The riveting tool oil pressure reaches the set value or the movable forming anvil is squeezed to the specified position and stops moving forward, and the riveting is completed; Step 5: Under the action of the de-riveting oil pressure, the movable riveting arm returns to its initial position, and the forming anvil remains on the collar riveting fixation; Step 6: Remove the riveting tool from the connected parts and the riveting operation is completed.

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