CN114184479A

CN114184479A - Polyethylene blown film tensile strength detection device

Info

Publication number: CN114184479A
Application number: CN202111297085.0A
Authority: CN
Inventors: 林黛琴; 曾莉; 聂绍丽; 钟永红; 谢艳芳; 王妍力
Original assignee: Jiangxi Product Quality Supervision And Testing Institute Jiangxi Defective Product Recall Center
Current assignee: Jiangxi Product Quality Supervision And Testing Institute Jiangxi Defective Product Recall Center
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-03-15

Abstract

The invention discloses a device for detecting the tensile strength of a polyethylene blown film, which comprises a bottom plate and a side plate, wherein a first fixed plate is arranged on the upper surface of the bottom plate, a sliding plate is matched on the first fixed plate in a sliding manner, a lifting mechanism for driving the sliding plate to move up and down is arranged at the upper end of the side plate, clamping mechanisms for clamping the film are arranged at the middle part and two sides of the lower surface of the top wall of the sliding plate and the upper surface of the bottom wall of the first fixed plate, each clamping mechanism comprises a fixed block, threaded rods penetrate through the middle parts of the fixed blocks at two sides and are in threaded connection with the fixed blocks, one end of each threaded rod is rotationally connected with the sliding plate and then extends to the outer part of the sliding plate and is driven by a driving mechanism to rotate so as to drive the clamping mechanisms at two sides to move horizontally, the device can cut the polyethylene film and stretch the polyethylene film, and can stretch the polyethylene film, has the advantages of time and labor saving, convenient operation and high detection precision.

Description

Polyethylene blown film tensile strength detection device

Technical Field

The invention relates to the technical field of film tensile strength detection, in particular to a device for detecting the tensile strength of a polyethylene blown film.

Background

The polyethylene blown film is a commonly used packaging bag material at present, and has the advantages of high transparency, good thickness uniformity, easy heat sealing, low cost and the like. The data of the film needs to be detected in the production process, wherein the tensile strength test of the film is one of important test data.

When prior art detected polyethylene blown film tensile strength, the staff generally followed a monoblock polyethylene blown film with the help of ruler and blade earlier and intercepted the film of certain length and width, then with check out test set's fixture clip polyethylene blown film's both ends and drag the film, thereby measure polyethylene blown film's tensile strength, simultaneously in order to ensure measuring result's accuracy, reduce the error, need many times the intercepting film to measure, lead to current polyethylene blown film tensile strength detection device to waste time and energy, and artifical intercepting is difficult to guarantee the size of film unanimous.

Disclosure of Invention

The invention aims to improve and innovate the defects and problems in the prior art and provides a device for detecting the tensile strength of a polyethylene blown film.

In order to achieve the purpose, the invention provides the following technical scheme: a polyethylene blown film tensile strength detection device comprises a bottom plate and side plates, wherein a first fixed plate is arranged on the upper surface of the bottom plate, a sliding plate is arranged on the first fixed plate in a sliding fit mode, a lifting mechanism for driving the sliding plate to move up and down is arranged at the upper end of each side plate, clamping mechanisms for clamping films are arranged in the middle of the lower surface of the top wall of the sliding plate and the upper surface of the bottom wall of the first fixed plate and on two sides of the lower surface of the top wall of the sliding plate, each clamping mechanism comprises a fixed block, threaded rods penetrate through the middle of the fixed blocks on two sides and are in threaded connection with the fixed blocks, one end of each threaded rod is rotatably connected with the sliding plate and then extends to the outer portion of the sliding plate and is driven by the driving mechanism to rotate, so that the clamping mechanisms on two sides are driven to move horizontally, electric telescopic rods are arranged on the side plates, at least two electric telescopic rods are respectively arranged on two sides of the clamping mechanisms in the middle, the telescopic end of the electric telescopic rod is fixedly connected with a second fixing plate, a cutting knife is arranged on the front surface of the second fixing plate, communicating grooves used for the second fixing plate to move back and forth are formed in the middle of the first fixing plate and the sliding plate, a through groove used for the telescopic end of the electric telescopic rod to move up and down is further formed in the middle of the first sliding plate, and a measuring mechanism used for measuring the stretching length of a film is further arranged on the sliding plate.

Further proposal is that the driving mechanism comprises a motor, a second fixed rod and a telescopic rod, the motor is arranged on the first fixed plate, the motor drives the second fixed rod to rotate through the transmission mechanism, the inner surface of the second fixed rod is in sliding fit with the outer surface of the telescopic rod, ribs are distributed on the outer surface of the telescopic rod in an annular array manner, a lower supporting plate is arranged on the outer surface of the middle part of the second fixed rod, and is in interference fit with a bearing arranged in the lower supporting plate, an upper supporting plate is arranged on the outer surface of the top end of the telescopic rod, and is in interference fit with a bearing arranged in the upper supporting plate, the upper supporting rod and the lower supporting plate are respectively and fixedly connected with the sliding plate and the first fixing plate through fixing rods, the bottom end of the second fixing rod and the telescopic rod drive the threaded rod to rotate through the driven conical gear and the driving conical gear which are meshed with each other, and the spiral directions of the threaded rod which is driven to rotate by the second fixing rod and the telescopic rod are opposite.

A further scheme is, the fixed block cross-section is the U type, clamping mechanism still include with fixed block threaded connection's lead screw, lead screw one end fixedly connected with knob, the lead screw other end supports the grip block, T type slider and fixed block sliding fit are passed through on the grip block top, the grip block is provided with the spring towards between one side of lead screw and the fixed block lateral wall.

The further scheme is that a clamping groove is formed in the middle of the sliding plate and the first fixing plate and is communicated with the front end of the communicating groove, the width of the clamping groove is larger than that of the communicating groove, a plug board is inserted into the clamping groove, and a strip-shaped groove corresponding to the cutting knife is formed in the plug board.

The measuring mechanism comprises a graduated scale arranged on a bottom plate, a rotating rod and a first fixed rod, wherein the edge of the upper end of the sliding plate is connected with the rotating rod, the bottom end of the rotating rod is rotatably connected with the sliding plate through a bearing seat, the rotating rod is welded with a positioning rod, jacks are formed in the rotating rod and the first fixed rod, and inserting rods are inserted into the jacks.

The further scheme is that sliding grooves are formed in the lower surface of the top wall of the sliding plate and two sides of the upper surface of the first fixing plate, and the fixing blocks located on two sides are in sliding fit with the sliding grooves through T-shaped sliding blocks.

The lifting mechanism comprises a top plate and hydraulic cylinders, the top plate is arranged on two sides of the upper end of the side plate, the hydraulic cylinders are arranged on the lower surface of the top plate, and the telescopic ends of the hydraulic cylinders are fixedly connected with the upper surface of the sliding plate.

The further proposal is that the clamping plate is provided with anti-skid insections.

The transmission mechanism comprises a driving gear and a driven gear which are meshed with each other, the driving gear is fixedly connected with the output end of the motor, and the driven gear is sleeved on the second fixing rod.

Compared with the prior art, the invention has the beneficial effects that: (1) the cutting device is ingenious in design and reasonable in structure, can be used for cutting the polyethylene film and stretching the polyethylene film, realizes integration of cutting and stretching of the polyethylene film, and has the advantages of time and labor saving, convenience in operation and high detection precision.

(2) The motor drives the second fixed rod to rotate, and the second fixed rod and the telescopic rod are matched with each other, so that the second fixed rod drives the telescopic rod to rotate simultaneously through the rib, the threaded rods positioned at the upper end and the lower end are further driven to rotate simultaneously, and the fixed blocks positioned at the upper end and the lower end on the same side are driven to move towards the edges of the sliding plate and the first fixed plate, so that the tensioning action of the polyethylene film in the horizontal direction is realized, the operation is convenient, meanwhile, the telescopic rod can move up and down along the central axis of the second fixed rod, and the tensioning action of the hydraulic cylinder on the polyethylene film in the vertical direction cannot be hindered;

(3) drive the second fixed plate through electric telescopic handle and move forward, laminate with the picture peg until the second fixed plate, after the second fixed plate was laminated with the picture peg mutually, the cutting knife cut off the polyethylene film that is located the clamping mechanism both sides at middle part, the second fixed plate is pushed down the in-process polyethylene film that the polyethylene film can prevent to cut with the picture peg and is slided, be favorable to the incision to level and smooth, the nimble setting of second fixed plate and picture peg simultaneously can not hinder the pneumatic cylinder to the tensile operation of polyethylene film, the tight operation of clamp of the polyethylene film of also being convenient for.

Drawings

FIG. 1 is a schematic front view of the strength testing apparatus of the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;

FIG. 3 is a schematic view of the upper surface structure of the slide plate of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 1 at B;

FIG. 5 is an enlarged view of a portion of FIG. 2;

FIG. 6 is a perspective view of a second fixing rod and a telescopic rod of the present invention;

FIG. 7 is a perspective view of the interposer of the present invention;

FIG. 8 is a perspective view of a second fixing plate according to the present invention;

reference numerals: the bottom plate 1, the curb plate 2, actuating mechanism 3, clamping mechanism 4, roof 5, the sliding plate 6, first fixed plate 7, the threaded rod 8, driven bevel gear 9, initiative bevel gear 10, spout 11, scale 12, dwang 13, first fixed rod 14, inserted bar 15, jack 16, locating lever 17, electric telescopic handle 18, picture peg 19, bar groove 20, second fixed plate 21, cutting knife 22, draw-in groove 23, intercommunication groove 24, logical groove 25, pneumatic cylinder 26, motor 31, driving gear 32, driven gear 33, second fixed rod 34, telescopic link 35, rib 36, go up backup pad 37, bottom suspension fagging 38, motor loading board 39, fixed block 41, clamping plate 42, spring 43, knob 44, lead screw 45.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings 1 to 8.

The utility model provides a polyethylene blown film tensile strength detection device, includes bottom plate 1 and curb plate 2, curb plate 2 installs in 1 upper surface rear end of bottom plate, 1 upper surface mid-mounting of bottom plate has first fixed plate 7, sliding fit has sliding plate 6 on first fixed plate 7, roof 5 and pneumatic cylinder 26 are installed to the upper end both sides of curb plate 2, pneumatic cylinder 26 is installed in roof 5 lower surface, pneumatic cylinder 26's flexible end and the 6 upper surface fixed connection of sliding plate, the 6 upward movement of pneumatic cylinder 26 drive sliding plate.

In this embodiment, clamping mechanism 4 that presss from both sides tight film is all installed to the middle part and both sides of sliding plate 6 roof lower surface and first fixed plate 7 diapire upper surface, clamping mechanism 4 includes fixed block 41, fixed block 41 cross-section is the U type, clamping mechanism 4 still includes the lead screw 45 with fixed block 41 threaded connection, lead screw 45 one end fixedly connected with knob 44, the lead screw 45 other end supports clamp plate 42, be provided with anti-skidding insection on the clamp plate 42, T type slider and fixed block 41 sliding fit are passed through on clamp plate 42 top, clamp plate 42 is provided with spring 43 towards between one side of lead screw 45 and the fixed block 41 lateral wall. The screw rod 45 is driven to move inwards by rotating the knob 44, the screw rod 45 extrudes the clamping plate 42 and stretches the spring 43, the clamping plate 42 is matched with the side wall of the fixed block 41 to clamp the polyethylene blown film, after the knob 44 is rotated in the opposite direction, the screw rod 45 does not extrude the clamping plate 42 any more, under the reset action of the spring 43, the clamping plate 42 moves towards one end close to the knob 44, and the film can conveniently penetrate between the clamping plate 42 and the side wall of the fixed block 41.

In this embodiment, the middle parts of the fixing blocks 41 on both sides penetrate through the threaded rod 8 and are in threaded connection with the threaded rod, the sliding grooves 11 are formed in both sides of the lower surface of the top wall of the sliding plate 6 and both sides of the upper surface of the first fixing plate 7, the fixing blocks 41 on both sides are in sliding fit with the sliding grooves 11 through the T-shaped sliding blocks, one end of the threaded rod 8 is rotatably connected with the sliding plate 6 and then extends to the outside of the sliding plate 6 and is driven to rotate by the driving mechanism 3, so that the clamping mechanisms 4 on both sides are driven to move horizontally, and when the clamping mechanisms 4 clamp the film, the tensioning effect in the horizontal direction of the film is achieved.

In this embodiment, actuating mechanism 3 includes motor 31, dead lever 34 and telescopic link 35, motor 31 passes through motor loading board 39 and installs on first fixed plate 7, motor 31's output fixedly connected with driving gear 32, driving gear 32 meshing is connected with driven gear 33, driven gear 33 cover is established on second dead lever 34, second dead lever 34 internal surface and telescopic link 35 surface sliding fit, the annular array distribution of telescopic link 35 surface has rib 36 for second dead lever 34 passes through rib 36 and drives telescopic link 35 rotatory simultaneously, and telescopic link 35 can be along the up-and-down motion of the axis of second dead lever 34 simultaneously. The outer surface of the middle part of the second fixing rod 34 is provided with a lower support plate 38, and is in interference fit with a bearing arranged in the lower support plate 38, so that the lower support plate 38 cannot obstruct the rotation of the second fixing rod 34, and simultaneously plays a role in supporting the second fixing rod 34, the outer surface of the top end of the telescopic rod 35 is provided with an upper support plate 37, and is in interference fit with the bearing arranged in the upper support plate 37, so that the upper support plate 37 cannot obstruct the rotation of the telescopic rod 35, and simultaneously plays a role in supporting the telescopic rod 35, the upper support plate 37 and the lower support plate 38 are respectively fixedly connected with the sliding plate 6 and the first fixing plate 7 through the fixing rods, and when the hydraulic cylinder 26 drives the sliding plate 6 to move upwards, the telescopic rod 35 can also be driven to move upwards. The bottom end of the second fixing rod 34 and the telescopic rod 35 both drive the threaded rod 8 to rotate through the driven bevel gear 9 and the driving bevel gear 10 which are meshed with each other, and the second fixing rod 34 and the telescopic rod 35 respectively drive the rotating threaded rod 8 to have opposite spiral directions, so that the fixing block 41 can be driven to move in the same direction even if the rotating directions of the threaded rods 8 at the upper end and the lower end are opposite.

In this embodiment, the side plate 2 is provided with four electric telescopic rods 18, the electric telescopic rods 18 are respectively arranged at two sides of the clamping mechanism 4 at the middle part, a second fixing plate 21 is fixedly connected with the telescopic end of the electric telescopic rod 18, a cutting knife 22 is arranged on the front surface of the second fixing plate 21, the middle parts of the first fixed plate 7 and the sliding plate 6 are respectively provided with a communicating groove 24 and a clamping groove 23, the communicating groove 24 is used for the second fixed plate 21 to move back and forth, the middle part of the first sliding plate 6 is also provided with a through groove 25 for the telescopic end of the electric telescopic rod 18 to move up and down, the clamping groove 23 is communicated with the front end of the communicating groove 24, an inserting plate 19 is inserted in the clamping groove 23, and the width of the clamping groove 23 is larger than that of the communicating groove 24, so that the inserting plate 19 cannot incline like the communicating groove 24, the clamping groove 23 can fix the inserting plate 19, and the inserting plate 19 is provided with a strip-shaped groove 20 corresponding to the cutting knife 22.

In this embodiment, the sliding plate 6 is further provided with a measuring mechanism for measuring the stretched length of the film, the measuring mechanism includes a graduated scale 12 installed on the bottom plate 1, and a rotating rod 13 and a first fixing rod 14 at the edge of the upper end of the sliding plate 6, the bottom end 13 of the rotating rod is rotatably connected with the sliding plate 6 through a bearing seat, a positioning rod 17 is welded on the rotating rod 13, insertion holes 16 are formed in the rotating rod 13 and the first fixing rod 14, and insertion rods 15 are inserted into the insertion holes 16. After the restriction of the rotating rod 13 by the inserting rod 15 is released, the rotating rod 13 is rotated to drive the positioning rod 17 to rotate, so that the positioning rod 17 is in contact with the scale 12, and the length of the polyethylene film is obtained.

The working principle of the invention is as follows: when the device is used specifically, a complete polyethylene film is prepared, the polyethylene film penetrates through each clamping mechanism 4, then the adjusting knob 44 is rotated to drive the screw rod 45 to extrude the clamping plate 42, the clamping plate 42 is matched with the fixing block 41 to clamp the polyethylene film, and the 6 clamping mechanisms 4 are matched with each other to respectively clamp the four corners, the upper end and the lower end of the polyethylene film; then, inserting the inserting plate 19 into the clamping groove 23 on the sliding plate 6 and the first fixing plate 7, then starting the hydraulic cylinder 26, wherein the hydraulic cylinder 26 drives the sliding plate 6 to slide upwards to play a role in adjusting the distance between the top wall of the sliding plate 6 and the bottom wall of the first fixing plate 7, thereby realizing the tensioning function of the polyethylene film in the vertical direction; then starting the motors 31 positioned at the two sides of the first fixing plate 7, wherein the motors 31 drive the second fixing rods 34 to rotate, the second fixing rods 34 are matched with the telescopic rods 35 to drive the telescopic rods 35 to rotate simultaneously, and further drive the threaded rods 8 positioned at the upper end and the lower end to rotate simultaneously, and the fixing blocks 41 positioned at the upper end and the lower end at the same side are driven to move towards the edges of the sliding plate 6 and the first fixing plate 7 due to the opposite spiral directions of the threaded rods 8, so that the tensioning effect of the polyethylene film in the horizontal direction is realized; at this moment, the electric telescopic rod 18 is started, the electric telescopic rod 18 drives the second fixing plate 21 to move forwards until the second fixing plate 21 is attached to the inserting plate 19, after the second fixing plate 21 is attached to the inserting plate 19, the cutting knife 22 cuts off the polyethylene film at two sides of the clamping mechanism 4 positioned in the middle, the polyethylene film can be prevented from sliding when the second fixing plate 21 and the inserting plate 19 press the polyethylene film, the cut is smooth, after the cutting is finished, the electric telescopic rod 18 drives the second fixing plate 21 to move reversely, the inserting plate 19 is taken out, then the hydraulic cylinder 26 continues to drive the sliding plate 6 to move upwards, the polyethylene film stretching detection work is started, the polyethylene film is continuously stretched until the polyethylene film is broken, finally, the limit of the inserting rod 15 on the rotating rod 13 is removed, the rotating rod 13 can be rotated, the positioning rod 17 is driven to rotate, and the positioning rod 17 is in contact with the scale 12, and obtaining the length of the polyethylene film when the polyethylene film is broken, and finishing the detection work of the tensile strength of the polyethylene film.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a polyethylene blown film tensile strength detection device, includes bottom plate (1) and curb plate (2), its characterized in that: the upper surface of the bottom plate (1) is provided with a first fixing plate (7), the first fixing plate (7) is provided with a sliding plate (6) in a sliding fit mode, the upper end of the side plate (2) is provided with a lifting mechanism for driving the sliding plate (6) to move up and down, the middle parts and two sides of the lower surface of the top wall of the sliding plate (6) and the upper surface of the bottom wall of the first fixing plate (7) are respectively provided with a clamping mechanism (4) for clamping a thin film, each clamping mechanism (4) comprises a fixing block (41), the middle parts of the fixing blocks (41) on two sides penetrate through a threaded rod (8) and are in threaded connection with the threaded rod, one end of each threaded rod (8) is rotatably connected with the sliding plate (6) and then extends to the outside of the sliding plate (6) and is driven by a driving mechanism (3) to rotate, so that the clamping mechanisms (4) on two sides are driven to move horizontally, and the side plate (2) is provided with an electric telescopic rod (18), the number of the electric telescopic rods (18) is at least two, the electric telescopic rods are respectively arranged on two sides of the clamping mechanism (4) located in the middle, a second fixing plate (21) is fixedly connected with the telescopic end of each electric telescopic rod (18), a cutting knife (22) is arranged on the front surface of each second fixing plate (21), communicating grooves (24) used for the second fixing plate (21) to move back and forth are formed in the middle of each first fixing plate (7) and each sliding plate (6), through grooves (25) used for the telescopic ends of the electric telescopic rods (18) to move up and down are further formed in the middle of each first sliding plate (6), and measuring mechanisms used for measuring the stretching length of the thin films are further arranged on the sliding plates (6).

2. The apparatus for detecting the tensile strength of polyethylene blown film according to claim 1, wherein: the driving mechanism (3) comprises a motor (31), a second fixing rod (34) and a telescopic rod (35), the motor (31) is installed on the first fixing plate (7), the motor (31) drives the second fixing rod (34) to rotate through a transmission mechanism, the inner surface of the second fixing rod (34) is in sliding fit with the outer surface of the telescopic rod (35), ribs (36) are distributed on the outer surface of the telescopic rod (35) in an annular array mode, a lower supporting plate (38) is arranged on the outer surface of the middle of the second fixing rod (34) and is in interference fit with a bearing arranged in the lower supporting plate (38), an upper supporting plate (37) is arranged on the outer surface of the top end of the telescopic rod (35) and is in interference fit with the bearing arranged in the upper supporting plate (37), and the upper supporting plate (37) and the lower supporting plate (38) are fixedly connected with the sliding plate (6) and the first fixing plate (7) through the fixing rods respectively, the bottom end of the second fixing rod (34) and the telescopic rod (35) drive the threaded rod (8) to rotate through the driven bevel gear (9) and the driving bevel gear (10) which are meshed with each other, and the second fixing rod (34) and the telescopic rod (35) drive the rotating threaded rod (8) to be opposite in spiral direction respectively.

3. The apparatus for detecting the tensile strength of polyethylene blown film according to claim 1 or 2, wherein: the U type is personally submitted in fixed block (41) cross-section, clamping mechanism (4) still include with fixed block (41) threaded connection's lead screw (45), lead screw (45) one end fixedly connected with knob (44), lead screw (45) other end supports clamp plate (42), T type slider and fixed block (41) sliding fit are passed through on clamp plate (42) top, be provided with spring (43) between one side of clamp plate (42) towards lead screw (45) and fixed block (41) lateral wall.

4. The apparatus for detecting the tensile strength of polyethylene blown film according to claim 1, wherein: the cutting device is characterized in that a clamping groove (23) is formed in the middle of the sliding plate (6) and the first fixing plate (7), the clamping groove (23) is communicated with the front end of the communicating groove (24), the width of the clamping groove (23) is larger than that of the communicating groove (24), a plug board (19) is inserted into the clamping groove (23), and a strip-shaped groove (20) corresponding to the cutting knife (22) is formed in the plug board (19).

5. The apparatus for detecting the tensile strength of polyethylene blown film according to claim 1, wherein: measuring mechanism is including dwang (13) and first dead lever (14) of installing scale (12) and sliding plate (6) upper end edge on bottom plate (1), dwang bottom (13) are rotated with sliding plate (6) through the bearing frame and are connected, the welding has locating lever (17) on dwang (13), jack (16) have been seted up on dwang (13) and first dead lever (14), jack (16) interpolation is equipped with inserted bar (15).

6. The apparatus for detecting the tensile strength of polyethylene blown film according to claim 1, wherein: sliding chutes (11) are formed in the lower surface of the top wall of the sliding plate (6) and the two sides of the upper surface of the first fixing plate (7), and the fixing blocks (41) located on the two sides are in sliding fit with the sliding chutes (11) through T-shaped sliding blocks.

7. The apparatus for detecting the tensile strength of polyethylene blown film according to claim 1, wherein: the lifting mechanism comprises a top plate (5) and hydraulic cylinders (26), the top plate (5) is installed on two sides of the upper end of the side plate (2), the hydraulic cylinders (26) are installed on the lower surface of the top plate (5), and the telescopic ends of the hydraulic cylinders (26) are fixedly connected with the upper surface of the sliding plate (6).

8. The apparatus for detecting the tensile strength of polyethylene blown film according to claim 1, wherein: the clamping plate (42) is provided with anti-skid insections.

9. The apparatus for detecting the tensile strength of polyethylene blown film according to claim 1, wherein: the transmission mechanism comprises a driving gear (32) and a driven gear (33) which are meshed with each other, the driving gear (32) is fixedly connected with the output end of the motor (39), and the driven gear (33) is sleeved on the second fixing rod (34).