Pre-tightening force mechanism

Abstract

The utility model discloses a pre-tightening force mechanism, and relates to the technical field of workpiece machining. The pre-tightening force mechanism comprises a mounting back plate, a top plate is arranged at the upper end of the outer wall of the mounting back plate, and a longitudinal moving mechanism is arranged on the upper side of the top plate; the fixing block is installed at the output end of the longitudinal moving mechanism, a push rod is fixedly inserted in the middle of the fixing block, the lower side of the outer wall of the push rod is movably sleeved with a sleeve, and the bottom end of the sleeve is connected with a pre-tightening ejector pin; wherein a supporting spring is arranged in the sleeve, the upper end of the supporting spring is supported on the lower surface of the push rod, the lower end of the supporting spring is connected with a pressure sensor, and the pressure sensor is installed on the lower surface of an inner cavity of the sleeve. The pre-tightening ejector pin can keep the same pressure to be pressed on the workpiece, enough pre-tightening force is kept on the workpiece, and the workpiece is not prone to being damaged. Even if the pre-tightening ejector pin is abraded or bent and deformed, enough pre-tightening force can be kept for the workpiece.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece processing, in particular to a pre-tightening mechanism. Background Art

[0002] When processing two workpieces, in order to ensure that the positions of the two workpieces remain aligned, a pre-tightening and pressing mechanism is usually added between the two workpieces to press the two workpieces to facilitate subsequent processing operations, such as welding operations, screw connections, etc.

[0003] The current pre-tightening and pressurizing mechanism usually includes a moving drive mechanism and a ejector pin. The two workpieces are stacked in advance, and the moving drive mechanism drives the ejector pin to move and press against one of the workpieces, which is then pressed against the other workpiece, thereby achieving the pressing of the two workpieces.

[0004] The mobile driving mechanism pushes the ejector pin to move, and its moving stroke is usually pre-set. When in use, the moving stroke of the ejector pin is certain. As practical use progresses, the ejector pin may wear or be deformed by pressure, and it is easy for the ejector pin to have loose contact with the workpiece or even no contact at all, thus affecting the pretightening effect. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a preload mechanism, which solves the problems of wear or compression deformation of the ejector pin, and loose or even no contact between the ejector pin and the workpiece.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the utility model is implemented through the following technical solutions: the preload mechanism includes:

[0009] A mounting back plate, wherein a top plate is disposed at the upper end of the outer wall of the mounting back plate, and a longitudinal moving mechanism is disposed on the upper side of the top plate;

[0010] A fixed block, the fixed block is installed at the output end of the longitudinal moving mechanism, a push rod is fixedly inserted in the middle of the fixed block, a sleeve is movably sleeved on the lower side of the outer wall of the push rod, and a pre-tightening ejector pin is connected to the bottom end of the sleeve;

[0011] A support spring is provided inside the sleeve, the upper end of the support spring is supported on the lower surface of the push rod, the lower end of the support spring is connected to a pressure sensor, and the pressure sensor is installed on the lower surface of the inner cavity of the sleeve.

[0012] Preferably, a protective cover is detachably connected to the front wall of the mounting back plate, the protective cover is hollow and has an opening at the bottom, and the longitudinal moving mechanism, the fixing block, the sleeve, and the pre-tightening ejector pin are all located inside the protective cover.

[0013] Preferably, a slewing bearing is provided at the bottom of the sleeve, and the upper end of the preload ejector pin is inserted into the inner ring of the slewing bearing.

[0014] Preferably, a slide rail is provided on the outer wall of the mounting back plate, a movable slider is slidably connected to the outer wall of the slide rail, a fixed bracket is provided on the outer wall of the movable slider, a through hole is opened on the fixed bracket, the lower side of the sleeve is inserted into the through hole, and the outer wall of the sleeve is fixedly connected to the through hole.

[0015] Preferably, the longitudinal moving mechanism includes a driving motor arranged on the top plate, a lead screw connected to the lower side of the driving motor output shaft, an upper slider and a lower support plate located at the lower side of the upper slider are arranged on the outer wall of the mounting back plate, the upper slider is slidably connected to the outer wall of the slide rail, an internal thread block is arranged on the upper slider, the lead screw is threadably matched with the internal thread block, the bottom end of the lead screw is rotatably connected to the lower support plate, and the fixed block is connected to the upper slider.

[0016] Preferably, a mounting block is provided on a side wall of the mounting back plate away from the fixing block, a waist-shaped positioning groove is provided on the mounting back plate, and the mounting block is connected to the waist-shaped positioning groove by screws.

[0017] (III) Beneficial effects

[0018] The utility model provides a pre-tightening mechanism, which has at least the following beneficial effects compared with the prior art:

[0019] The longitudinal moving mechanism can push the fixed block and the push rod downward, and the push rod pushes the support spring, the sleeve, and the preload pin until the preload pin contacts the workpiece. At this time, the push rod continues to descend, and the support spring is compressed and squeezes the pressure sensor. The pressure sensor detects the compressed pressure. When the compressed pressure reaches the required preload pressure, the longitudinal moving mechanism can stop working.

[0020] This operation method allows the preload pin to maintain the same pressure on the workpiece, maintain sufficient preload force on the workpiece, and not easily cause damage to the workpiece. Even if the preload pin is worn or bent, it can still maintain sufficient preload force on the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the utility model after the protective cover is installed;

[0022] Figure 2 This is a schematic diagram of the structure of the utility model after removing the protective cover;

[0023] Figure 3 It is a schematic diagram of the internal structure of the sleeve of the utility model.

[0024] In the figure: 1. Install the back plate; 2. Protective cover; 3. Top plate; 4. Drive motor; 5. Slide rail; 6. Upper slider; 7. Internal thread block; 8. Lead screw; 9. Lower support plate; 10. Fixed block; 11. Push rod; 12. Fixed bracket; 13. Sleeve; 14. Support spring; 15. Pressure sensor; 16. Rotary bearing; 17. Preload ejector pin; 18. Moving slider. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Embodiment 1:

[0027] See also Figure 1-3 , the utility model provides a technical solution: a pre-tightening mechanism, comprising: a mounting back plate 1, a fixing block 10;

[0028] A top plate 3 is provided at the upper end of the outer wall of the mounting back plate 1, and a longitudinal moving mechanism is provided on the upper side of the top plate 3. The fixed block 10 is installed at the output end of the longitudinal moving mechanism. A push rod 11 is fixedly inserted in the middle of the fixed block 10. A sleeve 13 is movably sleeved on the lower side of the outer wall of the push rod 11. A pre-tightening ejector pin 17 is connected to the bottom end of the sleeve 13. A support spring 14 is provided inside the sleeve 13. The upper end of the support spring 14 is supported on the lower surface of the push rod 11. The lower end of the support spring 14 is connected to a pressure sensor 15. The pressure sensor 15 is installed on the lower surface of the inner cavity of the sleeve 13.

[0029] Analysis of the above content: The output end of the longitudinal moving mechanism (i.e., the upper slider 6 below) can drive the fixed block 10 and the push rod 11 to move. The push rod 11 is coaxially installed with the sleeve 13. In order to prevent the push rod 11 from separating from the sleeve 13, a larger push plate is connected to the bottom end of the push rod 11, and the push plate is located in the sleeve 13. The push rod 11 drives the sleeve 13, the preload ejector pin 17 and other structures to descend until the preload ejector pin 17 contacts the workpiece.

[0030] At this time, the push rod 11 continues to descend, the support spring is compressed and squeezes the pressure sensor 15, the pressure sensor 15 detects the pressure, the pressure sensor 15 is externally connected to the PLC controller, the PLC controller presets the preload pressure value, and when the pressure sensor 15 detects that the pressure reaches the preload pressure value, the PLC controller outputs the control longitudinal movement mechanism to stop working. After the workpiece is constructed, the longitudinal movement mechanism drives the sleeve 13, the preload ejector pin 17 and other structures to rise and reset.

[0031] Embodiment 2:

[0032] See also Figure 1-3 The utility model provides a technical solution based on the first embodiment: a protective cover 2 is detachably connected to the front wall of the mounting back plate 1, and the protective cover 2 is hollow with an opening at the bottom, and the longitudinal moving mechanism, the fixing block 10, the sleeve 13, and the pre-tightening ejector pin 17 are all located inside the protective cover 2.

[0033] Analysis of the above content: The setting of the protective cover 2 protects the longitudinal moving mechanism, the fixed block 10, the sleeve 13, the pre-tightening ejector pin 17 and other structures from the outside, and the pre-tightening ejector pin 17 can extend downward from the lower opening of the protective cover 2.

[0034] Embodiment three:

[0035] See also Figure 1-3 The utility model provides a technical solution based on the first embodiment: a slewing bearing 16 is provided at the bottom of the sleeve 13 , and the upper end of the preload ejector pin 17 is inserted into the inner ring of the slewing bearing 16 .

[0036] Analysis of the above content: The setting of the slewing bearing 16 enables the preload pin 17 to rotate relative to the sleeve 13. During the processing of the workpiece, it is sometimes necessary to rotate the workpiece. Through the setting of the slewing bearing 16, when the workpiece rotates, the preload pin 17 can rotate with the rotation of the workpiece, thereby avoiding severe friction between the preload pin 17 and the workpiece.

[0037] Embodiment 4:

[0038] See also Figure 1-3 The utility model provides a technical solution based on the first embodiment: a slide rail 5 is arranged on the outer wall of the mounting back plate 1, a movable slider 18 is slidably connected to the outer wall of the slide rail 5, a fixed bracket 12 is arranged on the outer wall of the movable slider 18, a through hole is opened on the fixed bracket 12, the lower side of the sleeve 13 is inserted into the through hole, and the outer wall of the sleeve 13 is fixedly connected to the through hole.

[0039] Analysis of the above content: The matching connection between the slide rail 5 and the movable slider 18 restricts the movement of the sleeve 13, thereby preventing the sleeve 13 from tilting and making the sleeve 13 move smoothly.

[0040] Embodiment five:

[0041] See also Figure 1-3The utility model provides a technical solution based on Example 4: the longitudinal moving mechanism includes a driving motor 4 arranged on the top plate 3, a lead screw 8 connected to the lower side of the output shaft of the driving motor 4, an upper slider 6 and a lower support plate 9 located at the lower side of the upper slider 6 are arranged on the outer wall of the mounting back plate 1, the upper slider 6 is slidably connected to the outer wall of the slide rail 5, an internal thread block 7 is arranged on the upper slider 6, the lead screw 8 is threadedly matched with the internal thread block 7, the bottom end of the lead screw 8 is rotatably connected to the lower support plate 9, and the fixed block 10 is connected to the upper slider 6.

[0042] Analysis of the above content: When in use, the driving motor 4 drives the lead screw 8 to rotate, and the lead screw 8 cooperates with the internal thread block 7 of the upper slider 6, so that the upper slider 6, the internal thread block 7 and the lead screw 8 rotate relative to each other, and the upper slider 6 and the internal thread block 7 move longitudinally. The upper slider 6 can drive the fixed block 10 to move up and down, thereby realizing the pushing movement of the push rod 11.

[0043] Embodiment six:

[0044] See also Figure 1-3 The utility model provides a technical solution based on the first embodiment: a mounting block is provided on a side wall of the mounting back plate 1 away from the fixing block 10, a waist-shaped positioning groove is provided on the mounting back plate 1, and the mounting block is connected to the waist-shaped positioning groove by screws.

[0045] Analysis of the above content: Figure 2 As shown, the waist-shaped positioning groove is opened on the mounting back plate 1. When the height of the mounting back plate 1 needs to be adjusted, the screws between the mounting block and the waist-shaped positioning groove are loosened, and the relative position between the mounting block and the mounting back plate 1 is adjusted, and then the screws are tightened again.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A preload mechanism, characterized in that: include: A mounting back plate (1), wherein a top plate (3) is arranged at the upper end of the outer wall of the mounting back plate (1), and a longitudinal movement mechanism is arranged on the upper side of the top plate (3); A fixed block (10), the fixed block (10) being installed at the output end of the longitudinal moving mechanism, a push rod (11) being fixedly inserted in the middle of the fixed block (10), a sleeve (13) being movably sleeved on the lower side of the outer wall of the push rod (11), and a pre-tightening ejector pin (17) being connected to the bottom end of the sleeve (13); A support spring (14) is arranged inside the sleeve (13), the upper end of the support spring (14) is supported on the lower surface of the push rod (11), the lower end of the support spring (14) is connected to a pressure sensor (15), and the pressure sensor (15) is installed on the lower surface of the inner cavity of the sleeve (13).

2. The preload mechanism according to claim 1, characterized in that: A protective cover (2) is detachably connected to the front wall of the mounting back plate (1); the protective cover (2) is hollow and has an opening at the bottom; the longitudinal moving mechanism, the fixing block (10), the sleeve (13), and the pre-tightening ejector pin (17) are all located inside the protective cover (2).

3. The preload mechanism according to claim 1, characterized in that: A slewing bearing (16) is arranged at the bottom of the sleeve (13), and the upper end of the preload ejector pin (17) is inserted into the inner ring of the slewing bearing (16).

4. The preload mechanism according to claim 1, characterized in that: A slide rail (5) is arranged on the outer wall of the mounting back plate (1), a movable slider (18) is slidably connected to the outer wall of the slide rail (5), a fixed bracket (12) is arranged on the outer wall of the movable slider (18), a through hole is opened on the fixed bracket (12), the lower side of the sleeve (13) is inserted into the through hole, and the outer wall of the sleeve (13) is fixedly connected to the through hole.

5. The preload mechanism according to claim 4, characterized in that: The longitudinal moving mechanism comprises a driving motor (4) arranged on a top plate (3), a lead screw (8) connected to the lower side of an output shaft of the driving motor (4), an upper slider (6) and a lower support plate (9) located at the lower side of the upper slider (6) are arranged on the outer wall of the mounting back plate (1), the upper slider (6) is slidably connected to the outer wall of the slide rail (5), an internal thread block (7) is arranged on the upper slider (6), the lead screw (8) is threadedly matched with the internal thread block (7), the bottom end of the lead screw (8) is rotatably connected to the lower support plate (9), and the fixed block (10) is connected to the upper slider (6).

6. The preload mechanism according to claim 1, characterized in that: A mounting block is arranged on a side wall of the mounting back plate (1) away from the fixing block (10), a waist-shaped positioning groove is provided on the mounting back plate (1), and the mounting block is connected to the waist-shaped positioning groove by means of screws.

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