Floor spring

Abstract

The floor spring comprises a shell, a supporting plate assembly, a connecting rod assembly, a piston assembly, a spring and a cam shaft, a sealing cavity is formed in the shell, the two ends of the connecting rod assembly are connected with the piston assembly and the supporting plate assembly respectively, and the connecting rod assembly is sleeved with the spring; the cam shaft comprises a shaft body and a first blade which are integrated. The shaft body comprises an upper column and a lower column. The supporting plate assembly comprises an upper supporting plate, a lower supporting plate and a positioning wheel assembly, the upper supporting plate is provided with a U-shaped groove, the lower supporting plate is provided with a strip-shaped hole, and the supporting plate assembly and the cam shaft are assembled together in the mode that the upper column is embedded into the U-shaped groove of the upper supporting plate and the lower column is inserted into the strip-shaped hole of the lower supporting plate. By arranging the shaft body and the first blade which are integrated, the manufacturing and installing efficiency of the cam shaft is improved, the upper supporting plate is provided with the U-shaped groove, the shaft body is inserted into the U-shaped groove to be connected with the upper supporting plate, and the installing efficiency of the floor spring can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical accessories, and in particular relates to a floor spring. Background Art

[0002] The floor spring is a hydraulic door closer. Because the worm gear can rotate forward and reverse, the floor spring can be used for doors that open in both directions, while the door closer can only be used for doors that open in one direction.

[0003] The basic configuration of floor spring is top axis and bottom axis (or foot). Top axis is the accessory that connects door frame and door leaf at the top, and is composed of a bolt-type axis fixed on the door leaf and adjustable by bolts, and a shaft sleeve fixed on the door leaf. Top axis and bottom axis can be applied to almost all wooden, steel, aluminum alloy doors and frameless glass doors using glass door clamps.

[0004] The camshaft is a component that connects the door rocker arm and the floor spring body. The camshaft includes a shaft body and blades. Usually, the shaft body and the blades are made separately and then assembled into the camshaft. The separate production of the shaft body and the blades not only increases the production process, but also increases the assembly workload, which greatly reduces the installation efficiency of the floor spring. Utility Model Content

[0005] In order to improve the installation efficiency of the floor spring, the utility model provides a floor spring for installation at the bottom of a door leaf, wherein the floor spring comprises a shell, a support plate assembly, a connecting rod assembly, a piston assembly, a spring and a camshaft, wherein a sealing cavity is arranged in the shell, and the main parts of the support plate assembly, the connecting rod assembly, the piston assembly, the spring and the camshaft are respectively arranged in the sealing cavity, and the two ends of the connecting rod assembly are respectively connected to the piston assembly and the support plate assembly, and the spring is sleeved on the connecting rod assembly; the camshaft comprises an integrated shaft body and a first blade, and the shaft body comprises An upper column vertically connected to the upper surface of the first blade and a lower column vertically connected to the lower surface of the first blade; the support plate assembly includes an upper support plate, a lower support plate and a positioning wheel assembly, the upper support plate is provided with a U-shaped groove, the lower support plate is provided with a strip hole, and the support plate assembly is assembled with the camshaft in a manner that the upper column is embedded in the U-shaped groove of the upper support plate and the lower column is inserted into the strip hole of the lower support plate, the positioning wheel assembly is partially located between the upper support plate and the lower support plate, and the camshaft pushes the positioning wheel assembly to make the upper support plate and the lower support plate perform reciprocating linear motion.

[0006] Furthermore, the camshaft also includes a second blade integrated with the upper column, the second blade is located above the first blade, and the upper support plate is inserted between the first blade and the second blade; the positioning wheel assembly includes an intermediate roller, the intermediate roller is located on the upper support plate and the lower support plate near one end of the connecting rod assembly, and when the forward or reverse opening angle of the door leaf is 0-90° or 120-180°, the second blade abuts against the intermediate roller.

[0007] Furthermore, the upper column and the lower column are coaxial, the width of the U-shaped groove is matched with the diameter of the upper column, the width of the strip hole is matched with the diameter of the lower column, and the bottom of the U-shaped groove is semicircular.

[0008] Furthermore, the positioning wheel assembly also includes a side roller, and the middle roller protrudes from the upper surface of the upper support plate and abuts against the second blade. The side roller is connected to the upper support plate and the lower support plate away from one end of the connecting rod assembly, and the side roller abuts against the first blade.

[0009] Further, the positioning wheel assembly includes two side rollers, the two side rollers are located on both sides of the opening end of the U-shaped groove, the two side rollers and the middle roller are distributed in an isosceles triangle, and the extension line of the connecting rod assembly constitutes the perpendicular bisector of the isosceles triangle;

[0010] The first blade is circular or nearly circular as a whole, and the edge of the first blade is provided with a first groove, a second groove, a third groove and a fourth groove adapted to the edge roller, and the first groove and the second groove, the third groove and the fourth groove are respectively axially symmetrical along the axis where the connecting rod assembly is located; when the door leaf is closed, the two edge rollers are respectively embedded in the first groove and the second groove; when the door leaf is opened to 90°, one of the edge rollers rests on the side wall of the first blade and moves to embed into the third groove or the fourth groove for positioning.

[0011] Furthermore, the second blade includes a main body and a first convex portion and a second convex portion respectively protruding from the front end or rear end edge of the main body, the first convex portion is arc-shaped, the second convex portion is conical, and when the door leaf is closed, the middle roller abuts against the tip of the second convex portion; when the door leaf is opened and rotated to 120-180°, the first convex portion of the second blade abuts against the middle roller.

[0012] Further, the connecting rod assembly includes an upper connecting rod and a lower connecting rod arranged in parallel, and the upper connecting rod and the lower connecting rod each include a short side and a long side that are vertically connected as an integral whole. The upper connecting rod and the lower connecting rod are connected to the upper support plate and the lower support plate through the short sides, and are connected to the piston assembly through the long sides and assembled in the sealing cavity of the shell. The short sides of the upper connecting rod and the lower connecting rod are flush with the width of the upper support plate and the lower support plate and are connected between the upper support plate and the lower support plate. The free ends of the long sides of the upper connecting rod and the lower connecting rod are inserted into the end of the piston assembly and are connected to the piston assembly through a piston pin. The upper connecting rod and the lower connecting rod also have a protrusion formed by stamping, and the protrusion is located on the long sides of the upper connecting rod and the lower connecting rod.

[0013] Furthermore, the protrusion is respectively located on the upper surface of the upper connecting rod and the lower surface of the lower connecting rod, the spring is simultaneously sleeved on the long sides of the upper connecting rod and the lower connecting rod, one end of the spring is abutted against the short side, and the other end of the spring is abutted against the piston assembly, the surface of the protrusion is in the shape of an arc with the same radius as the spring, the spacing between the protrusions of the upper connecting rod and the lower connecting rod is equal to the inner diameter of the spring, and when the upper connecting rod and the lower connecting rod are assembled in the shell, the protrusion is adapted to the inner circumference of the spring.

[0014] Furthermore, the positioning wheel assembly also includes a roller shaft connected to the side roller and a stopper connected to the middle roller, the upper support plate and the lower support plate are provided with through holes connected to the side roller and the middle roller respectively, the roller shaft includes two end columns and a middle column coaxially connected to the end columns and having a diameter larger than the end columns, the two end columns are respectively inserted into the through holes of the upper support plate and the lower support plate and abut against the upper support plate and the lower support plate through the middle column, the end faces of the end columns are flush with the upper surface of the upper support plate, and the side rollers are sleeved on the middle columns;

[0015] The middle roller includes a vertically arranged rib and a connecting column, the baffle sleeve is sleeved on the connecting column and is located between the upper support plate and the lower support plate, the two ends of the baffle sleeve are respectively abutted against the upper support plate and the lower support plate, the rib is abutted against the upper surface of the upper support plate, an upper roller is also provided between the rib and the upper support plate, and the first blade is abutted against the upper roller.

[0016] Furthermore, the support plate assembly also includes a countersunk screw, which passes through the upper support plate, the upper connecting rod, the lower connecting rod and the lower support plate in sequence to lock and fix the upper support plate and the lower support plate to the upper connecting rod and the lower connecting rod respectively.

[0017] The beneficial effect of the floor spring provided by the utility model is that the camshaft is formed by an integrated shaft body and a first blade, which not only saves the manufacturing time of the camshaft, but also greatly improves the installation efficiency of the shaft body and the first blade. In addition, the upper support plate is provided with a U-shaped groove, and the integrated shaft body and the first blade are directly inserted into the U-shaped groove and connected to the upper support plate, which can also greatly improve the installation efficiency of the floor spring.

[0018] In addition, the camshaft also includes a second blade, which abuts against the middle roller, and the first blade abuts against the side roller and can rotate 180° relative to the side roller. The second blade is located above the upper support plate and will not be blocked by the side roller. Therefore, the first blade and the second blade can drive the shaft body to rotate 180°, thereby achieving a maximum door opening angle of 180° for the floor spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the explosion structure of the floor spring provided by the utility model;

[0020] Figure 2 It is a structural schematic diagram of the upper support plate portion of the floor spring provided by the utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the camshaft portion of the floor spring provided by the utility model;

[0022] Figure 4 This is a schematic structural diagram of the camshaft portion of the floor spring provided by the utility model from another perspective:

[0023] Figure 5 It is a structural schematic diagram of the upper connecting rod part of the floor spring provided by the utility model;

[0024] Figure 6 It is a partial structural schematic diagram of the connecting rod assembly of the floor spring provided by the utility model;

[0025] In the figure:

[0026] 1. Shell; 2. Support plate assembly; 21. Upper support plate; 211. U-shaped groove; 22. Lower support plate; 221. Strip hole; 23. Positioning wheel assembly; 231. Middle roller; 232. Side roller; 233. Roller shaft; 234. Upper roller; 235. Stop sleeve; 24. Countersunk screw; 3. Connecting rod assembly; 31. Upper connecting rod; 32. Lower connecting rod; 33. Long side; 34. Short side; 35. Protrusion; 4. Piston assembly; 41. Piston pin; 5. Spring; 6. Camshaft; 61. Shaft body; 611. Upper column; 612. Lower column; 62. First blade; 63. Second blade; 631. First convex part; 632. Second convex part; 633. Main body. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] See also Figure 1 , is a schematic diagram of a floor spring provided by an embodiment of the utility model. This embodiment provides a floor spring, which is used to be installed at the bottom of a door leaf, and the floor spring includes a housing 1, a support plate assembly 2, a connecting rod assembly 3, a piston assembly 4, a spring 5 and a camshaft 6. A sealed cavity is provided in the housing 1, and the main bodies of the support plate assembly 2, the connecting rod assembly 3, the piston assembly 4, the spring 5 and the camshaft 6 are respectively installed in the sealed cavity, and the two ends of the connecting rod assembly 3 are respectively connected to the piston assembly 4 and the support plate assembly 2, and the spring 5 is sleeved on the connecting rod assembly 3; the camshaft 6 includes an integrated shaft body 61 and a first blade 62 (such as Figure 3 ), which can save the manufacturing time of the shaft body 61 and the first blade 62 and improve the manufacturing efficiency of the camshaft 6; the shaft body 61 includes an upper column 611 vertically connected to the upper surface of the first blade 62 and a lower column 612 vertically connected to the lower surface of the first blade 62; the support plate assembly 2 includes an upper support plate 21, a lower support plate 22 and a positioning wheel assembly 23, and the upper support plate 21 is provided with a U-shaped groove 211 (such as Figure 2 ), the lower support plate 22 is provided with a strip hole 221, and the support plate assembly 2 is assembled with the camshaft 6 in such a manner that the upper column 611 is embedded in the U-shaped groove 211 of the upper support plate 21, and the lower column 612 is inserted into the strip hole 221 of the lower support plate 22, the positioning wheel assembly 23 is partially located between the upper support plate 21 and the lower support plate 22, and the camshaft 6 makes the upper support plate 21 and the lower support plate 22 perform reciprocating linear motion by pushing the positioning wheel assembly 23, and the U-shaped groove 211 is provided on the upper support plate 21, the lower column 612 of the shaft body 61 can be inserted into the strip hole 221, and the upper column 611 is directly embedded in the U-shaped groove 211, so as to realize the connection between the camshaft 6 and the support plate assembly 2, thereby greatly improving the installation efficiency of the camshaft 6 and the support plate assembly 2, thereby improving the installation efficiency of the floor spring 5.

[0029] In one embodiment of the present invention, the camshaft 6 further includes a second blade 63 (such as Figure 3), the second blade 63 is arranged in parallel with the first blade 62, and the second blade 63 is located above the first blade 62, and the upper support plate 21 is inserted between the first blade 62 and the second blade 63; the positioning wheel assembly 23 includes an intermediate roller 231 connected to the upper support plate 21 and the lower support plate 22 near one end of the connecting rod assembly 3, and when the door leaf is opened at a forward or reverse angle of 0-90° or 120-180°, the second blade 63 abuts against the intermediate roller 231, and the second blade 63 is located above the upper support plate 21 and abuts against the intermediate roller 23 1 is abutted against each other, and the second blade 63 can be driven by the shaft body 61 to rotate 180° above the upper supporting plate 21, so as to realize the 180° rotation of the cam shaft 6 to open and close the door. In fact, since the door leaf and the door frame have a certain thickness, although the maximum rotation angle of the cam shaft 6 is 180°, the actual opening angle of the door leaf is slightly less than 180°. Compared with the conventional floor spring with a door opening angle of 90°, the present application can increase the opening angle of the door leaf, avoid impact or damage when the door leaf is opened by 90°, and improve the application scope of the floor spring.

[0030] In one embodiment of the present invention, the upper column 611 and the lower column 612 are coaxially arranged, the width of the U-shaped groove 211 is adapted to the diameter of the upper column 611, and the width of the strip hole 221 is adapted to the diameter of the lower column 612. Therefore, when the upper column 611 is embedded in the U-shaped groove 211 and the lower column 612 is inserted into the strip hole 221, the upper column 611 and the lower column 612 are respectively abutted against the inner walls of the U-shaped groove 211 and the strip hole 221, thereby improving the tightness of the connection between the shaft body 61 and the upper support plate 21 and the lower support plate 22, and can reduce the sound generated by the collision between the shaft body 61 and the upper support plate 21 and the lower support plate 22, and the bottom of the U-shaped groove 211 is semicircular. When the upper column 611 slides into the bottom of the U-shaped groove 211, the outer wall of the upper column 611 is completely fitted with the inner wall of the U-shaped groove 211, fully realizing the close fit between the shaft body 61 and the upper support plate 21.

[0031] In one embodiment of the present invention, the positioning wheel assembly 23 also includes two side rollers 232, and the two side rollers 232 are located on both sides of the open end of the U-shaped groove 211. The two side rollers 232 and the middle roller 231 are distributed in an isosceles triangle, and the extension line of the connecting rod assembly 3 constitutes the perpendicular bisector of the isosceles triangle; thereby, the camshaft 6 is rotated in the same forward and reverse angles under the abutment of the two side rollers 232, and the middle roller 231 protrudes from the upper surface of the upper support plate 21 and abuts against the second blade 63, the side roller 232 is connected to the upper support plate 21 and the lower support plate 22 away from the end of the connecting rod assembly 3, the side roller 232 is located between the upper support plate 21 and the lower support plate 22 and abuts against the first blade 62, and the staggered arrangement of the first blade 62 and the second blade 63 in the vertical direction can avoid the second blade 63 from contacting the side roller 232, thereby blocking the rotation of the second blade 63, and then realizing a 180° rotation of the second blade 63.

[0032] Specifically, the first blade 62 is in a circular or nearly circular shape (a shape close to a circle but not a perfect circle) coaxial with the shaft body 61 as a whole, so the first blade 62 can rotate 180° following the shaft body 61, and the edge of the first blade 62 is provided with a first groove, a second groove, a third groove and a fourth groove adapted to the side roller 232, wherein the first groove and the second groove are arranged near the front end of the first blade 62, and the third groove and the fourth groove are arranged near the rear end of the first blade 62, and the first groove and the second groove, the third groove and the fourth groove are respectively axially symmetrical along the axis where the connecting rod assembly 3 is located. When the door leaf is closed, the two side rollers 232 are respectively embedded in the first groove and the second groove, and abut against the inner walls of the first groove and the second groove, so as to realize the door closing positioning of the camshaft 6; when the door leaf is opened to 90°, one of the side rollers 232 abuts against the side wall of the first blade 62 and moves clockwise or counterclockwise to be embedded in the third groove or the fourth groove, and abuts against the inner wall of the second groove or the fourth groove, so as to realize the door leaf opening 90° positioning.

[0033] In one embodiment of the present invention, the second blade 63 includes a main body 633, a first convex portion 631 and a second convex portion 632 (eg, Figure 4 ), the first convex portion 631 and the second convex portion 632 are integrated with the main body 633 and are respectively located at the front end and the rear end of the main body 633, the first convex portion 631 is in an arc shape, and the second convex portion 632 is in a cone shape. When the door leaf is closed, the tip of the second convex portion 632 abuts against the middle roller 231, making the door leaf easier to open; when the door leaf is opened and rotated to 120-180°, the first convex portion 631 of the second blade 63 abuts against the middle roller 231, and at the same time, the side wall between the third groove and the fourth groove on the first blade 62 abuts against the side roller 232, and within this angle range, the friction between the middle roller 231 and the first convex portion 631 of the second blade 63 and the friction between the side roller 232 and the side wall of the first blade 62 are both relatively large, so that the camshaft 6 can be fixed at any angle, thereby realizing multi-angle fixation of the floor spring and improving the applicable range of the floor spring.

[0034] In one embodiment of the present invention, the connecting rod assembly 3 includes an upper connecting rod 31 and a lower connecting rod 32 arranged in parallel, and the upper connecting rod 31 and the lower connecting rod 32 each include a short side 34 and a long side 33 (such as Figure 5), the upper connecting rod 31 and the lower connecting rod 32 are connected to the upper supporting plate 21 and the lower supporting plate 22 through the short side 34, and the long side 33 is connected to the piston assembly 4 and assembled into the sealed cavity of the housing 1; the short sides 34 of the upper connecting rod 31 and the lower connecting rod 32 are flush with the width of the upper supporting plate 21 and the lower supporting plate 22, and the upper connecting rod 31 is connected to the bottom of the upper supporting plate 21, and the lower connecting rod 32 is located below the upper connecting rod 31 and connected to the top of the lower supporting plate 22. The piston assembly 4 is provided with a connecting groove near one end of the connecting rod assembly 3, and the free ends of the long sides 33 of the upper connecting rod 31 and the lower connecting rod 32 are inserted into the connecting groove at the end of the piston assembly 4, and are connected to the piston assembly 4 through a piston pin 41. The piston pin 41 passes through the upper connecting rod 31 and the lower connecting rod 32 at the same time in the vertical direction and is inserted into the connecting groove to realize the rapid assembly of the connecting rod assembly 3 and the piston assembly 4. The upper connecting rod 31 and the lower connecting rod 32 also have a protrusion 35 (such as Figure 5 ), the protrusion 35 is located at the long side 33 of the upper connecting rod 31 and the lower connecting rod 32. By providing the protrusion 35, the strength and deformation resistance of the upper connecting rod 31 and the lower connecting rod 32 can be improved, thereby improving the service life of the floor spring 5.

[0035] In one embodiment of the present invention, the protrusions 35 are respectively located on the upper surface of the upper connecting rod 31 and the lower surface of the lower connecting rod 32. The spring 5 passes through part of the upper connecting rod 31 and the lower connecting rod 32 and is sleeved on the long sides 33 of the upper connecting rod 31 and the lower connecting rod 32. One end of the spring 5 abuts against the short side 34, and the other end of the spring 5 abuts against the piston assembly 4. The surface of the protrusion 35 is in an arc shape with the same radius as the spring 5 (such as Figure 6 ), the spacing between the protrusions 35 of the upper connecting rod 31 and the lower connecting rod 32 is equal to the inner diameter of the spring 5, and when the upper connecting rod 31 and the lower connecting rod 32 are assembled in the housing 1, the spring 5 is sleeved on the upper connecting rod 31 and the lower connecting rod 32 and abuts against the inner wall of the spring 5, and the protrusion 35 fits with the inner circumference of the spring 5, thereby realizing a tight connection between the upper connecting rod 31 and the lower connecting rod 32 and the spring 5, and reducing the sound generated by the collision between the connecting rod assembly 3 and the spring 5, thereby interfering with and reducing the noise of the floor spring.

[0036] In one embodiment of the utility model, the positioning wheel assembly 23 also includes a roller shaft 233 connected to the side roller 232 and a stopper sleeve 235 connected to the middle roller 231. The upper support plate 21 and the lower support plate 22 are provided with through holes connected to the side roller 232 and the middle roller 231 respectively. The roller shaft 233 includes two end columns and a middle column coaxially connected to the end columns and having a diameter larger than the end columns. The two end columns are respectively inserted into the through holes of the upper support plate 21 and the lower support plate 22 and abut against the upper support plate 21 and the lower support plate 22 through the two ends of the middle column. The end faces of the end columns are flush with the upper surface of the upper support plate 21. The side roller 232 is sleeved on the middle column and abuts against the upper support plate 21 and the lower support plate 22.

[0037] The middle roller 231 includes a vertically integrated retaining edge and a connecting column. The retaining sleeve 235 is sleeved on the connecting column and is located between the upper support plate 21 and the lower support plate 22. The two ends of the retaining sleeve 235 are respectively abutted against the upper support plate 21 and the lower support plate 22. The retaining edge is abutted against the upper surface of the upper support plate 21. An upper roller 234 is also provided between the retaining edge and the upper support plate 21. The upper roller 234 is sleeved on the position of the connecting column located above the upper support plate 21, and the first blade 62 is abutted against the upper roller 234 to achieve the positioning of the first blade 62.

[0038] In one embodiment of the utility model, the support plate assembly 2 also includes a countersunk screw 24, which passes through the upper support plate 21, the upper connecting rod 31, the lower connecting rod 32 and the lower support plate 22 in sequence, and locks and fixes the upper support plate 21 and the lower support plate 22 with the upper connecting rod 31 and the lower connecting rod 32 respectively, thereby realizing the connection between the support plate assembly 2 and the connecting rod assembly 3, and improving the tightness of the connection between the upper support plate 21, the lower support plate 22 and the upper connecting rod 31 and the lower connecting rod.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A floor spring, used for installation at the bottom of a door leaf, the floor spring comprises a housing, a support plate assembly, a connecting rod assembly, a piston assembly, a spring and a camshaft, a sealed cavity is provided in the housing, the main parts of the support plate assembly, the connecting rod assembly, the piston assembly, the spring and the camshaft are respectively installed in the sealed cavity, and the two ends of the connecting rod assembly are respectively connected to the piston assembly and the support plate assembly, and the spring is sleeved on the connecting rod assembly; characterized in that, The camshaft includes an integral shaft body and a first blade, the shaft body includes an upper column vertically connected to the upper surface of the first blade and a lower column vertically connected to the lower surface of the first blade; the support plate assembly includes an upper support plate, a lower support plate and a positioning wheel assembly, the upper support plate is provided with a U-shaped groove, the lower support plate is provided with a strip hole, and the support plate assembly is assembled with the camshaft in such a way that the upper column is embedded in the U-shaped groove of the upper support plate and the lower column is inserted into the strip hole of the lower support plate, the positioning wheel assembly is partially located between the upper support plate and the lower support plate, and the camshaft pushes the positioning wheel assembly to make the upper support plate and the lower support plate perform reciprocating linear motion.

2. The floor spring according to claim 1, characterized in that: The camshaft also includes a second blade integral with the upper column, the second blade is located above the first blade, and the upper support plate is inserted between the first blade and the second blade; the positioning wheel assembly includes an intermediate roller, the intermediate roller is located on the upper support plate and the lower support plate close to one end of the connecting rod assembly, and when the forward or reverse opening angle of the door leaf is 0-90° or 120-180°, the second blade abuts against the intermediate roller.

3. The floor spring according to claim 1, characterized in that: The upper column and the lower column are coaxial, the width of the U-shaped groove is matched with the diameter of the upper column, the width of the strip hole is matched with the diameter of the lower column, and the bottom of the U-shaped groove is semicircular.

4. The floor spring according to claim 2, characterized in that: The positioning wheel assembly also includes a side roller, and the middle roller protrudes from the upper surface of the upper support plate and abuts against the second blade. The side roller is connected to the upper support plate and the lower support plate at one end away from the connecting rod assembly, and the side roller abuts against the first blade.

5. The floor spring according to claim 4, characterized in that: The positioning wheel assembly includes two side rollers, the two side rollers are located on both sides of the opening end of the U-shaped groove, the two side rollers and the middle roller are distributed in an isosceles triangle, and the extension line of the connecting rod assembly constitutes the perpendicular bisector of the isosceles triangle; The first blade is circular as a whole, and the edge of the first blade is provided with a first groove, a second groove, a third groove and a fourth groove adapted to the edge roller, and the first groove and the second groove, the third groove and the fourth groove are respectively axially symmetrical along the axis of the connecting rod assembly; when the door leaf is closed, the two edge rollers are respectively embedded in the first groove and the second groove; when the door leaf is opened to 90°, one of the edge rollers rests on the side wall of the first blade and moves to embed into the third groove or the fourth groove for positioning.

6. The floor spring according to claim 5, characterized in that: The second blade includes a main body and a first convex portion and a second convex portion respectively protruding from the front end or rear end edge of the main body, the first convex portion is arc-shaped, the second convex portion is conical, and when the door leaf is closed, the middle roller abuts against the tip of the second convex portion, and when the door leaf is opened and rotated to 120-180°, the first convex portion of the second blade abuts against the middle roller.

7. The floor spring according to claim 1, characterized in that: The connecting rod assembly includes an upper connecting rod and a lower connecting rod arranged in parallel, and the upper connecting rod and the lower connecting rod each include a short side and a long side that are vertically connected as an integral whole. The upper connecting rod and the lower connecting rod are connected to the upper supporting plate and the lower supporting plate through the short sides, and are connected to the piston assembly through the long sides and assembled in the sealing cavity of the shell. The short sides of the upper connecting rod and the lower connecting rod are flush with the width of the upper supporting plate and the lower supporting plate and are connected between the upper supporting plate and the lower supporting plate. The free ends of the long sides of the upper connecting rod and the lower connecting rod are inserted into the end of the piston assembly and are connected to the piston assembly through a piston pin. The upper connecting rod and the lower connecting rod also have a protrusion formed by stamping, and the protrusion is located on the long sides of the upper connecting rod and the lower connecting rod.

8. The floor spring according to claim 7, characterized in that: The protrusions are respectively located on the upper surface of the upper connecting rod and the lower surface of the lower connecting rod, and the spring is simultaneously sleeved on the long sides of the upper connecting rod and the lower connecting rod. One end of the spring abuts against the short side, and the other end of the spring abuts against the piston assembly. The surface of the protrusion is in the shape of an arc with the same radius as that of the spring. The spacing between the protrusions of the upper connecting rod and the lower connecting rod is equal to the inner diameter of the spring. When the upper connecting rod and the lower connecting rod are assembled in the housing, the protrusion is adapted to the inner circumference of the spring.

9. The floor spring according to claim 4, characterized in that: The positioning wheel assembly also includes a roller shaft connected to the side roller and a stopper connected to the middle roller, the upper support plate and the lower support plate are provided with through holes connected to the side roller and the middle roller respectively, the roller shaft includes two end columns and a middle column coaxially connected to the end columns and having a diameter larger than the end columns, the two end columns are respectively inserted into the through holes of the upper support plate and the lower support plate and abut against the upper support plate and the lower support plate through the middle column, the end faces of the end columns are flush with the upper surface of the upper support plate, and the side rollers are sleeved on the middle column; The middle roller includes a vertically arranged rib and a connecting column, the baffle sleeve is sleeved on the connecting column and is located between the upper support plate and the lower support plate, the two ends of the baffle sleeve are respectively abutted against the upper support plate and the lower support plate, the rib is abutted against the upper surface of the upper support plate, an upper roller is also provided between the rib and the upper support plate, and the first blade is abutted against the upper roller.

10. The floor spring according to claim 7, characterized in that: The support plate assembly also includes a countersunk screw, which passes through the upper support plate, the upper connecting rod, the lower connecting rod and the lower support plate in sequence to lock and fix the upper support plate and the lower support plate to the upper connecting rod and the lower connecting rod respectively.

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