Grating pre-tensioning device capable of achieving rapid clamping

Abstract

The utility model relates to a grating pre-tensioning device capable of achieving rapid clamping, and belongs to the technical field of grating machining equipment. The grating pre-tensioning device comprises a first fixed plate, a first movable plate, a second movable plate, a second fixed plate and a differential screw rod which are sequentially arranged side by side, the first fixed plate and the second fixed plate are connected through two connecting rods, and the first movable plate and the second movable plate are slidably connected to the two connecting rods; the first movable plate and the second movable plate are connected and fixed through two fixing rods, internal threaded holes are formed in the center of the first fixing plate and the center of the first movable plate along the same axis, and two sections of external threads of the differential lead screw are connected into the internal threaded holes of the first fixing plate and the internal threaded holes of the first movable plate in a threaded mode respectively. According to the grating pretensioning device, the adaptive differential screw rod is adopted, the resolution ratio during adjustment is high, an executing mechanism is simple, and the grating pretensioning wavelength can be rapidly and accurately adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of grating processing equipment, in particular to a grating pre-tensioning device capable of rapid clamping. Background Art

[0002] An optical fiber grating sensor is a device that measures temperature and strain by utilizing the sensitive characteristics of an optical fiber grating to these two physical quantities. In the production of this type of sensor, the optical fiber grating usually needs to be pre-stretched. In the prior art, the commonly used stretching method is to fix one end of the optical fiber grating with a general fixture and apply a tensile force to the other end with a heavy object. This method has the disadvantages of long clamping time, complex operation, susceptibility to interference, inconvenient adjustment, etc. At the same time, the encapsulation process of the sensor usually requires operations such as high-temperature aging of glue. Therefore, the method of pulling with a heavy object is very inconvenient for moving the optical fiber grating and the pre-tensioning device as a whole into a high-temperature oven for aging operation.

[0003] At the same time, since the adjustment of the pre-tension of the grating is usually within a very small range, for this requirement, the existing methods mostly adopt the method of combining a precision screw pair with a speed reducer to improve its resolution. The structure of the pre-tensioning device adopting this stretching method is relatively complex, occupies a large space, and has a relatively high manufacturing cost at the same time. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the utility model patent designs a grating pre-tensioning device capable of rapid clamping to solve the problems of inconvenient operation and complex structure of the existing grating pre-tensioning device.

[0005] The technical solution adopted by the utility model patent is as follows: the grating pre-tensioning device includes a differential lead screw, and a first fixed plate, a first movable plate, a second movable plate and a second fixed plate which are arranged side by side in sequence. The first fixed plate and the second fixed plate are fixedly connected by two connecting rods. The first movable plate and the second movable plate are respectively provided with through holes corresponding to the positions of the two connecting rods and are slidably connected to the two connecting rods. The first movable plate and the second movable plate are connected and fixed by two fixed rods. Inner threaded holes are respectively arranged at the centers of the first fixed plate and the first movable plate along the same axis. The two external threads of the differential lead screw are respectively threadedly connected to the inner threaded holes of the first fixed plate and the first movable plate. There is a pitch difference between the two external threads of the differential lead screw. Grating fixing holes are respectively arranged at the centers of the second fixed plate and the second movable plate along the same axis.

[0006] Further, a clamping mechanism is provided at the grating fixing hole on the second movable plate. An internally threaded fastening hole is vertically opened at the center of the upper side surface of the second movable plate. The bottom end of the internally threaded fastening hole penetrates through the grating fixing hole and is threadedly connected with a tightening bolt. An upper slider and a lower pressing block are oppositely arranged up and down in the grating fixing hole on the second movable plate. The center of the top of the upper slider is rotatably connected with the bottom end of the tightening bolt, and the bottom of the lower pressing block is fixed at the bottom of the grating fixing hole.

[0007] Further, two guiding holes are respectively opened on the upper slider and the lower pressing block at corresponding positions. Cylindrical pins are respectively fixed in the two guiding holes of the lower pressing block, and the upper parts of the two cylindrical pins are respectively slidably connected in the guiding holes of the corresponding upper slider.

[0008] Further, return springs are respectively sleeved outside the two cylindrical pins. Step surfaces are respectively arranged in the guiding holes of the upper slider and the lower pressing block, and the two ends of the return spring respectively abut against the step surfaces in the guiding holes of the upper slider and the lower pressing block.

[0009] Further, the grating fixing hole on the second fixing plate is composed of a fixing plate body with a corresponding semi-circular arc-shaped notch and a pressing plate. Three through internally threaded perforations are opened on the pressing plate. The internally threaded perforations on both sides of the pressing plate are connected with the fixing plate body through connecting bolts, and a pressing bolt is threadedly connected in the middle internally threaded perforation.

[0010] Further, perforations are respectively opened along the same axis at the centers of the first fixing plate and the first movable plate. A first copper nut is connected at the central perforation of the first fixing plate, and a second copper nut is connected at the central perforation of the first movable plate. The internal thread of the first copper nut is adapted to the external thread of the rear section of the differential screw rod, and the internal thread of the second copper nut is adapted to the external thread of the front section of the differential screw rod.

[0011] Further, a hand wheel is connected to the rear end of the differential screw rod.

[0012] Further, a backlash-preventing compression spring is sleeved outside the connecting rod between the first fixing plate and the first movable plate.

[0013] Further, graphite bronze bushes are respectively fixed at the perforations on both sides of the first movable plate and the second movable plate where they are slidably connected with the connecting rod. Perforations with a diameter the same as the outer diameter of the connecting rod are opened on the graphite bronze bushes.

[0014] Further, pressure pads are respectively arranged on the butting surfaces of the upper slider and the lower pressing block.

[0015] Compared with the prior art, the improvement of the grating pre-tensioning device with quick clamping designed in the utility model patent lies in that

[0016] The grating pre-tensioning device drives the first movable plate to move through a differential screw rod, thereby driving the second movable plate to move to achieve the stretching of the grating. Due to the pitch difference of the two sections of external threads on the differential screw rod, the second movable plate generates a small displacement, with higher control precision and higher resolution during adjustment, thus meeting the requirements for the micro-strain adjustment and measurement of the grating during pre-tensioning;

[0017] A backlash spring is provided on the connecting rod between the first fixed plate and the first movable plate of the grating pre-tensioning device to eliminate the thread fitting clearance caused by machining errors, ensuring that the threads always abut against one side;

[0018] Copper nuts with internal threads are respectively provided at the centers of the first fixed plate and the first movable plate of the grating pre-tensioning device for threaded connection with the differential screw rod. Graphite bronze bushings are provided on both movable plates for sliding connection with the connecting rod, ensuring the stability of the threaded connection and the sliding connection structure, and improving the durability of the overall structure;

[0019] The second fixed plate of the grating pre-tensioning device is provided with an upper slider and a lower pressing block for fixing the grating. A cylindrical pin is provided between the upper slider and the lower pressing block to provide a guiding function for their movement. Together with the return spring sleeved outside the cylindrical pin, it ensures the correct up and down movement direction of the upper slider and the smoothness of the up and down movement process. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the grating pre-tensioning device;

[0021] Figure 2 is a front view structural diagram of the grating pre-tensioning device;

[0022] Figure 3 is a top view structural diagram of the grating pre-tensioning device.

[0023] Description of the Reference Numerals

[0024] 1 First fixed plate, 2 Second fixed plate, 3 First movable plate, 4 Second movable plate, 5 Differential screw rod, 6 Connecting rod, 7 Fixed rod, 81 First copper nut, 82 Second copper nut, 9 Graphite bronze bushing, 10 Tightening bolt, 11 Upper slider, 12 Lower pressing block, 13 Return spring, 14 Cylindrical pin, 15 Pressure pad, 16 Fixed plate body, 17 Pressing plate, 18 Connecting bolt, 19 Compression bolt, 20 Handwheel, 21 Backlash compression spring. Detailed Embodiments

[0025] The following further describes the present utility model in conjunction with the drawings and specific embodiments.

[0026] As shown in Figure 1 、 2, as shown in FIGS. 3, an embodiment of a grating pre-tensioning device capable of quick clamping is disclosed in the utility model patent. In this embodiment, the grating pre-tensioning device includes a differential screw rod 5 and a first fixing plate 1, a first movable plate 3, a second movable plate 4 and a second fixing plate 2 arranged side by side in sequence. The two sides between the first fixing plate 1 and the second fixing plate 2 are connected and fixed by two metal connecting rods 6. The first movable plate 3 and the second movable plate 4 are connected and fixed by two fixing rods 7. Through holes are respectively formed in the two sides of the first movable plate 3 and the second movable plate 4 corresponding to the positions of the two connecting rods 6, and graphite copper sleeves 9 are respectively connected and fixed by screws at the through holes of the two movable plates. The central opening part of the graphite copper sleeve 9 is sleeved in the through hole on the fixing plate, and the diameter of the central opening is the same as the outer diameter of the connecting rod 6. The two sides of the two movable plates are respectively slidably connected to the two connecting rods 6 through the graphite copper sleeves 9. A backlash spring 21 is sleeved on the connecting rod 6 between the first fixing plate 1 and the first movable plate 3, and the two ends of the backlash spring 21 respectively press against the first fixing plate 1 and the first movable plate 3.

[0027] Through holes are respectively formed in the centers of the first fixing plate 1 and the first movable plate 3 along the same axis, and a first copper nut 81 and a second copper nut 82 are respectively installed and fixed by screws at the through holes of the two. The pitches of the internal threads of the two copper nuts are different. Two external threads with different pitches are provided on the differential screw rod 5, and the helix directions of the two external threads are both right-handed. The thread of the rear section is a metric fine pitch thread of M12X1, which is threadedly connected to the first copper nut 81 at the first fixing plate 1, and the thread of the front section is a British Whitworth fine pitch thread (1 / 4in.-26B.S.F.), which is threadedly connected to the second copper nut 82 at the first movable plate 3. The pitch difference between the two threads is 0.023mm. A hand wheel 20 is provided at the rear end of the differential screw rod 5.

[0028] Through holes for grating fixing are respectively arranged in the centers of the second fixing plate 2 and the second movable plate 4 along the same axis. Among them, the through hole for grating fixing on the second fixing plate 2 is composed of two parts, namely two semi-circular arc-shaped notches respectively formed on the fixing plate body 16 and the pressing plate 17. Three vertically penetrating internal thread through holes are arranged side by side on the pressing plate 17. Among them, the two internal thread through holes on both sides are respectively connected to the fixing plate body 16 through connecting bolts 18, and the internal thread through hole in the center vertically penetrates the semi-circular arc-shaped notch, and a pressing bolt 19 is threadedly connected therein.

[0029] A clamping mechanism is provided in the perforation for grating fixation on the second movable plate 4. An internally threaded fastening hole is vertically opened at the center of the upper side surface of the second movable plate 4, and the bottom end of the internally threaded fastening hole penetrates through the perforation for grating fixation, and a tightening bolt 10 is threadedly connected therein. An upper slider 11 and a lower pressing block 12 are oppositely arranged up and down in the perforation for grating fixation on the second movable plate 4. The center of the top of the upper slider 11 is rotatably connected to the bottom end of the tightening bolt 10, and the bottom of the lower pressing block 12 is fixed to the bottom of the perforation by screws. Guide holes with two stepped surfaces are respectively opened on the two sides of the upper slider 11 and the lower pressing block 12 corresponding to each other, and a cylindrical pin 14 is connected in the corresponding guide holes thereof. The bottom end of the cylindrical pin 14 is fixed in the guide hole of the lower pressing block 12 and is slidably connected to the guide hole of the upper slider 11. A return spring 13 is sleeved outside each of the two cylindrical pins 11, and both ends of the return spring 13 respectively abut against the stepped surfaces in the guide holes of the upper slider 11 and the lower pressing block 12. In addition, pressing pads 15 are respectively adhered to the butting surfaces of the upper slider 11 and the lower pressing block 12.

[0030] When the quickly clampable fiber grating pre-tensioning device disclosed in the utility model patent is in use, the fiber grating sensor is passed through the fixing perforation at the center of the second fixing plate 2, and the sensor is tightly fixed by using the pressing plate 17 and the pressing bolt 19. The end of the grating is inserted into the clamping mechanism of the fixing perforation of the second movable plate 4, and by screwing the tightening bolt 10, the upper slider 11 is moved downward to press the grating. Then, by rotating the handwheel 20, the differential lead screw 5 rotates. Due to the pitch difference of the external threads of the front and rear sections of the differential lead screw 5, the second movable plate 4 makes a slight movement, realizing the pre-tensioning of the grating, and at the same time meeting the requirements for the pre-tensioning micro-strain adjustment and measurement of the grating.

[0031] The above content is only a preferred embodiment of the present invention, and the scope of implementation of the present invention cannot be limited thereby. That is, all simple equivalent changes and modifications made according to the claims of the present invention and the description content of the invention still fall within the scope covered by the present invention.

Claims

1. A grating pre-tensioning device that can be quickly clamped, characterized in that: The grating pre-tensioning device includes a differential screw and a first fixed plate, a first movable plate, a second movable plate and a second fixed plate arranged side by side in sequence. The first fixed plate and the second fixed plate are fixedly connected by two connecting rods. The first movable plate and the second movable plate are respectively provided with through holes at positions corresponding to the two connecting rods and are slidably connected to the two connecting rods. The first movable plate and the second movable plate are connected and fixed by two fixing rods. The centers of the first fixed plate and the first movable plate are respectively provided with internal threaded holes along the same axis. The two sections of external threads of the differential screw are respectively threadedly connected to the internal threaded holes of the first fixed plate and the first movable plate. There is a pitch difference between the two sections of external threads of the differential screw. The centers of the second fixed plate and the second movable plate are respectively provided with grating fixing holes along the same axis.

2. The grating pre-tensioning device capable of rapid clamping according to claim 1, characterized in that: A clamping mechanism is provided at the grating fixing hole on the second movable plate, an internal thread fastening hole is vertically opened at the center of the upper side surface of the second movable plate, the bottom end of the internal thread fastening hole passes through the grating fixing hole and is threadedly connected with a tightening bolt, an upper slider and a lower pressing block are relatively arranged in the grating fixing hole on the second movable plate, the top center of the upper slider is rotatably connected to the bottom end of the tightening bolt, and the bottom of the lower pressing block is fixed to the bottom of the grating fixing hole.

3. The grating pre-tensioning device capable of rapid clamping according to claim 2, characterized in that: Two corresponding guide holes are respectively opened on the upper slider and the lower pressing block, and cylindrical pins are respectively fixed in the two guide holes of the lower pressing block, and the upper parts of the two cylindrical pins are respectively slidably connected in the corresponding guide holes of the upper slider.

4. The grating pre-tensioning device capable of rapid clamping according to claim 3, characterized in that: The outer sides of the two cylindrical pins are respectively sleeved with return springs, and the guide holes of the upper slider and the lower pressure block are respectively provided with step surfaces, and the two ends of the return spring respectively press the step surfaces in the guide holes of the upper slider and the lower pressure block.

5. The grating pre-tensioning device capable of rapid clamping according to claim 4, characterized in that: The grating fixing hole on the second fixing plate is composed of a fixing plate body and a pressing plate respectively provided with corresponding semicircular notches. The pressing plate is provided with three penetrating internal threaded through holes. The internal threaded through holes on both sides of the pressing plate are connected to the fixing plate body through connecting bolts, and a clamping bolt is threadedly connected in the middle internal threaded through hole.

6. The grating pre-tensioning device capable of rapid clamping according to claim 5, characterized in that: The centers of the first fixed plate and the first movable plate are respectively provided with through holes along the same axis, the center through hole of the first fixed plate is connected with a first copper nut, the center through hole of the first movable plate is connected with a second copper nut, the internal thread of the first copper nut is matched with the external thread of the rear section of the differential screw, and the internal thread of the second copper nut is matched with the external thread of the front section of the differential screw.

7. The grating pre-tensioning device capable of rapid clamping according to claim 6, characterized in that: The rear end of the differential screw is connected with a hand wheel.

8. The grating pre-tensioning device capable of rapid clamping according to claim 1, characterized in that: An anti-backlash compression spring is sleeved on the outer side of the connecting rod between the first fixed plate and the first movable plate.

9. The grating pre-tensioning device capable of rapid clamping according to claim 1, characterized in that: Graphite copper sleeves are respectively fixed at the through holes on both sides of the first movable plate and the second movable plate that are slidably connected to the connecting rod. The graphite copper sleeves are provided with through holes with the same diameter as the outer diameter of the connecting rod.

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