Floor spring

Abstract

The floor spring comprises a shell, a carriage assembly, a connecting rod, a piston and a cam shaft, the shell is provided with a gland and an end cover, an annular oil way is arranged between the shell and the piston, an oil port is formed in the shell, a speed regulating valve is inserted into the oil port, and the cam shaft comprises a shaft body and a cam. The carriage assembly is connected with a cam shaft, and is characterized in that the carriage assembly comprises an upper carriage, a lower carriage and a positioning wheel assembly, the positioning wheel assembly comprises a roller shaft and a connecting assembly, the roller shaft is connected between the upper carriage and the lower carriage, and the connecting assembly is connected with the upper carriage and the lower carriage. The connecting assembly comprises a first side roller made of a metal material and a second side roller made of a non-metal material, the first side roller is connected to the roller shaft in a sleeved mode, and the second side roller is connected to the first side roller in a sleeved mode. The second side roller made of the non-metal material is arranged on the outer side of the first side roller, so that the abrasion of the roller shaft and the cam shaft can be reduced, and the noise can be reduced.

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 closing device, which is mainly composed of a housing, a camshaft, a cover plate, a speed regulating valve, a piston, a tail cover, etc. In use, the floor spring is buried under the door leaf. When the door leaf is pushed open, the camshaft of the floor spring is driven to move, thereby compressing the spring in the floor spring to store energy. When the door is opened to a certain angle, the door leaf is released, and the energy stored in the spring pushes the piston assembly, pulls the connecting rod, squeezes the cam to rotate, and drives the door leaf back to the initial position to achieve the effect of closing the door.

[0003] The camshaft and the piston are connected by a drag plate assembly, and the drag plate assembly includes an upper drag plate, a lower drag plate and a positioning wheel assembly, and the upper drag plate and the lower drag plate are connected by the positioning wheel assembly. In the prior art, the positioning wheel assembly is usually made of a metal material with a smooth surface, and the synchronous rotation of the upper and lower drag plates and the abutment with the camshaft are achieved through the positioning wheel assembly. Because the positioning wheel assembly and the upper and lower drag plates are all made of metal, during the rotation of the camshaft, the positioning wheel assembly and the upper and lower drag plates will make a sound due to collision, and during the rotation of the camshaft, the positioning wheel assembly directly abuts against the camshaft and rotates relative to it, which will cause wear on the edge of the positioning wheel assembly and affect the service life of the floor spring. Utility Model Content

[0004] The utility model aims to provide a floor spring in order to reduce the wear of internal components of the floor spring and the sound of metal collision.

[0005] The utility model adopts the following technical solution to solve the technical problem: a floor spring, comprising a shell, and a carriage assembly, a connecting rod, a piston and a camshaft respectively arranged in the shell, a pressure cap is arranged at one end of the shell close to the carriage assembly, and an end cap is arranged at one end of the shell away from the carriage assembly, an annular oil circuit is arranged between the shell and the piston, an oil port communicating with the annular oil circuit is arranged on the shell, a speed regulating valve for adjusting the amount of hydraulic oil is inserted in the oil port, the camshaft comprises a shaft body and a cam, and the shaft body part passes through the pressure cap and protrudes above the shell; The carriage assembly is connected to the camshaft and drives the connecting rod and the piston to perform reciprocating linear motion under the drive of the cam. It is characterized in that the carriage assembly includes an upper carriage, a lower carriage and a positioning wheel assembly, the positioning wheel assembly includes a roller shaft and a connecting assembly, the roller shaft is connected between the upper carriage and the lower carriage in a vertical direction, the connecting assembly includes a first side roller made of metal material and a second side roller made of non-metallic material, and the first side roller is sleeved on the outer wall of the roller shaft, and the second side roller is sleeved on the outer wall of the first side roller and abuts against the cam.

[0006] Furthermore, the upper drag plate and the lower drag plate are arranged in parallel, and the upper drag plate and the lower drag plate are respectively provided with strip holes. The upper drag plate and the lower drag plate are connected together through a positioning wheel assembly in a manner of clamping the cam, and the part above and the part below the cam on the shaft body respectively pass through the strip holes of the upper drag plate and the lower drag plate, and when the camshaft rotates, the cam pushes the positioning wheel assembly to make the upper drag plate and the lower drag plate perform reciprocating linear motion relative to the camshaft.

[0007] Furthermore, the shaft body includes an active part connected to the door leaf rocker arm and a driven part connected to the floor spring housing, the cam is fixedly connected to the driven part and rotates synchronously with the shaft body; the wall surface of the active part in contact with the door leaf rocker arm is provided with a connecting groove, the connecting groove includes a sound receiving part, a sound collecting part and a sound emitting part which are sequentially connected from bottom to top, and the widths of the sound receiving part and the sound emitting part gradually increase from the connection position with the sound collecting part toward the direction away from the sound collecting part.

[0008] Furthermore, the active part has two symmetrical and flat cross-sections, and the door leaf rocker arm rotates the shaft body by pushing the cross-sections; the connecting groove is located on the cross-sections, the sound receiving part, the sound collecting part and the sound emitting part have the same depth, and the sound receiving part and the sound emitting part have the same axial size.

[0009] Furthermore, the active part is provided with two connecting grooves, which are symmetrically arranged on the two sections. The cross-section of the active part along the axis direction of the shaft body and the center line direction of the section is an isosceles trapezoid, and the center lines of the two sections constitute the hypotenuse of the isosceles trapezoid.

[0010] Furthermore, the connection groove is located in the middle of the section, and one end of the sound output portion facing away from the sound collecting portion extends to the top surface of the active portion and is in an open shape.

[0011] Furthermore, notches are provided at both ends of the roller shaft, and the upper drag plate and the lower drag plate respectively have mounting holes, and the parts with notches at both ends of the roller shaft are respectively inserted into the mounting holes of the upper drag plate and the lower drag plate and are interference fit with the mounting holes.

[0012] Furthermore, the upper drag plate and the lower drag plate are connected by three positioning wheel assemblies, the three positioning wheel assemblies are distributed in an isosceles triangle, the extension line of the connecting rod constitutes the perpendicular bisector of the isosceles triangle, and two of the positioning wheel assemblies are located at the end of the strip hole away from the piston.

[0013] Furthermore, the upper drag plate and the lower drag plate are connected via two positioning wheel assemblies, and the two positioning wheel assemblies are respectively located at two ends of the strip-shaped hole.

[0014] The beneficial effects of the floor spring provided by the utility model are that the upper drag plate and the lower drag plate are connected by a positioning wheel assembly, a first side roller is sleeved on the outer wall of the roller shaft, a second side roller made of non-metallic material is added outside the first side roller, the wear between the cam and the roller shaft can be reduced, and the metal-to-metal connection between the first side roller and the cam is changed to a metal-to-nonmetal connection between the cam and the second side roller, which can reduce the noise when the camshaft rotates. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the explosion structure of the floor spring provided by the utility model;

[0016] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0017] Figure 3 It is a schematic structural diagram of the positioning wheel assembly of the floor spring provided by the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the camshaft provided by the utility model:

[0019] Figure 5 It is a cross-sectional view of the cooperation between the camshaft and the door leaf rocker arm provided by the utility model;

[0020] Figure 6 This is another cross-sectional view of the camshaft and the door rocker arm provided by the utility model;

[0021] In the figure:

[0022] 1. Shaft body; 11. Active part; 111. Section; 12. Driven part; 13. Connecting groove; 131. Sound receiving part; 132. Sound collecting part; 133. Sound output part; 2. Cam; 3. Housing; 31. Pressure cover; 32. End cover; 4. Drag plate assembly; 41. Upper drag plate; 42. Lower drag plate; 43. Strip hole; 5. Connecting rod; 6. Piston; 7. Oil port; 8. Speed ​​regulating valve; 9. Positioning wheel assembly; 91. Roller shaft; 911. Notch; 92. First side roller; 93. Second side roller. DETAILED DESCRIPTION

[0023] 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.

[0024] See also Figure 1 , is a schematic diagram of a floor spring provided by an embodiment of the utility model. The utility model also provides a floor spring, including a shell 3, in which a carriage assembly 4, a connecting rod 5, a piston 6 and a camshaft are arranged in sequence. A pressure cap 31 is provided on the upper surface of the shell 3 near the end of the carriage assembly 4, and an end cap 32 is provided on the side of the end of the shell 3 away from the carriage assembly 4. An annular oil circuit is provided between the shell 3 and the piston 6. An oil port 7 communicating with the annular oil circuit is provided on the shell 3. The oil port 7 is inserted in a speed regulating valve 8 for adjusting the amount of hydraulic oil. The camshaft includes a shaft body 1 and a cam 2 connected to each other. The shaft body 1 partially passes through the pressure cap 31 in the vertical direction and protrudes above the shell 3. The carriage assembly 4 is connected to the camshaft. One end of the connecting rod 5 is connected to the end of the carriage assembly 4 away from the pressure cap 31, and the other end of the connecting rod 5 is connected to the piston 6. The carriage assembly 4 drives the connecting rod 5 and the piston 6 to perform reciprocating linear motion in the shell 3 under the drive of the cam 2 on the camshaft. The carriage assembly 4 is connected to the camshaft through a positioning wheel assembly 9.

[0025] See also Figure 3The carriage assembly 4 includes an upper carriage 41, a lower carriage 42 and a positioning wheel assembly 9. The positioning wheel assembly 9 includes a roller shaft 91 and a connecting assembly. The roller shaft 91 is connected to the upper carriage 41 and the lower carriage 42 in a vertical direction, and the two ends of the roller shaft 91 are respectively in contact with the upper carriage 41 and the lower carriage 42. The connecting assembly includes a first side roller 92 and a second side roller 93. The first side roller 92 and the roller shaft 91 are both made of metal materials with good strength and hardness. The first side roller 92 is sleeved on the outer wall of the roller shaft 91 (for example, the roller shaft 91 and the first side roller 92 are rotatably connected by balls, etc.), the second side roller 93 is made of non-metallic material and sleeved on the outer wall of the first side roller 92 (the second side roller 93 and the first side roller 92 can be tightly matched and cannot rotate relative to each other). The first side roller The two ends of 92 and the second side roller 93 are respectively abutted against the upper drag plate 41 and the lower drag plate 42, and the side wall of the second side roller 93 is abutted against the inner wall of the cam 2, so that the cam 2 is tightly connected with the upper drag plate 41 and the lower drag plate 42, and the second side roller 93 is added between the cam 2 and the first side roller 92, so that the direct connection between the cam 2 and the first side roller 92 can be changed to an indirect connection through the second side roller 93, thereby reducing the wear of the first side roller 92 when the cam 2 rotates and improving the energy efficiency ratio of the floor spring. The second side roller 93 made of non-metallic material can also change the metal friction between the cam 2 and the first side roller 92 to the non-metallic friction between the cam 2 and the second side roller 93, thereby reducing the noise generated when the cam 2 rotates and increasing the service life of the first side roller 92.

[0026] See also Figure 2 In one embodiment of the utility model, the upper carriage 41 and the lower carriage 42 are arranged parallel to each other, and the upper carriage 41 and the lower carriage 42 are respectively provided with a strip hole 43 for the horizontal sliding direction of the camshaft. The upper carriage 41 and the lower carriage 42 are connected to the upper and lower sides of the cam 2 through the positioning wheel assembly 9 in a manner of clamping the cam 2 up and down, and the part of the shaft body 1 located above the cam 2 and the part located below the cam 2 pass through the strip holes 43 of the upper carriage 41 and the lower carriage 42 respectively, and when the camshaft rotates, the cam 2 pushes the positioning wheel between the upper carriage 41 and the lower carriage 42, so that the positioning wheel assembly 9 drives the upper carriage 41 and the lower carriage 42 to make reciprocating linear motion relative to the camshaft, and the camshaft moves in the strip hole 43 relative to the upper carriage 41 and the lower carriage 42, thereby realizing the linear motion of the camshaft.

[0027] See also Figure 4The shaft body 1 includes an active part 11 for connecting with the door leaf rocker arm and a driven part 12 connected with the housing 3 of the floor spring. The wall surface where the active part 11 contacts with the door leaf rocker arm is provided with a connecting groove 13. The connecting groove 13 includes a sound receiving part 131, a sound collecting part 132 and a sound emitting part 133 which are sequentially connected from bottom to top. The widths of the sound receiving part 131 and the sound emitting part 133 gradually increase from the connection position with the sound collecting part 132 to the direction away from the sound collecting part 132, that is, the sound receiving part 131 and the sound emitting part 133 are both trumpet-shaped, and the cam 2 is connected to the driven part 12 and rotates synchronously with the shaft body 1.

[0028] By setting the sound receiving part 131 and the sound output part 133 in a speaker shape (such as Figure 5 ), the metal noise generated when the connection part between the door leaf rocker arm and the active part 11 rotates can be collected, the noise is collected to the sound collecting part 132, and transmitted to the sound emitting part 133 through the sound collecting part 132, and finally transmitted to the air through the sound emitting part 133, thereby reducing the cumulative amplification of the noise caused by the metal collision inside the floor spring, and because the sound receiving part 131 and the sound emitting part 133 are configured in a horn shape, the sound receiving and sound emitting effects of the connecting groove 13 can be better achieved. At the same time, since the door rocker arm is a forged part and is prone to protrusions, the door rocker arm is connected to the shaft body 1 through the protrusion point of the protruding part, and an inwardly concave connecting groove 13 is provided at the connecting position of the door rocker arm and the camshaft, so that the protruding part can be accommodated in the connecting groove 13, so that the wall surfaces of the shaft body 1 located on both sides of the connecting groove 13 are in contact and connected with the side surfaces next to the protrusion point of the door rocker arm, so that the point contact between the shaft body 1 and the door rocker arm is transformed into surface contact, thereby increasing the effective contact area, improving the connection stability between the shaft body 1 and the door rocker arm, and further reducing the noise generated by the collision between the shaft body 1 and the door rocker arm due to unstable connection.

[0029] In this embodiment, the active part 11 has two symmetrical and flat cross-sections 111. The door leaf rocker arm rotates by pushing the cross-section driving shaft body 1. The connecting groove 13 is located on the cross-section 111. The sound receiving part 131, the sound collecting part 132 and the sound output part 133 have the same depth along the vertical cross-section 111, and the sound receiving part 131 and the sound output part 133 have the same axial size, which can ensure that the capacity for absorbing and diffusing noise is the same, that is, the absorbed noise is just completely diffused, effectively improving the space utilization rate of the sound receiving part 131 and the sound output part 133, and transmitting the noise in the same direction, which can diffuse the noise faster and avoid noise accumulation and amplification inside the floor spring.

[0030] In this embodiment, the active part 11 is provided with two connecting grooves 13, and the two connecting grooves 13 are symmetrically arranged on the two cut surfaces 111. The cross section of the active part 11 along the axis direction of the shaft body 1 and the center line direction of the cut surface 111 is an isosceles trapezoid (such as Figure 6), and the midlines of the two cut surfaces 111 constitute the hypotenuse of an isosceles trapezoid, that is, the sound receiving parts 131 and the sound output parts 133 on both sides of the symmetry are gradually brought closer along the cut surface 111, so as to expand the coverage of the sound receiving part 131 as much as possible, improve the noise absorption efficiency, and reduce the sound output part 133 as much as possible, so as to concentrate and diffuse the noise from a smaller range, thereby effectively reducing the noise between the active part 11 and the door rocker arm and reducing the noise of the camshaft.

[0031] In this embodiment, the connecting grooves 13 on both sides are located in the middle of the cut surface 111, and one end of the sound outlet portion 133 facing away from the sound collecting portion 132 extends to the top surface of the active portion 11 and is open, that is, the connecting groove 13 is located at one end of the top of the sound outlet portion 133 and is open, so that the sound absorbed by the sound receiving portion 131 is diffused from the sound outlet portion 133 to the top surface of the active portion 11 through the sound collecting portion 132, and diffused from the top surface of the active portion 11 along the connecting gap into the air, thereby reducing the noise and sound inside the camshaft.

[0032] See also Figure 3 In one embodiment of the utility model, notches 911 are provided at both ends of the roller shaft 91, and the upper drag plate 41 and the lower drag plate 42 respectively have mounting holes corresponding to the notches 911. The two ends of the roller shaft 91 are respectively inserted into the mounting holes of the upper drag plate 41 and the lower drag plate 42, and the notches 911 are interference fit with the mounting holes of the upper drag plate 41 and the lower drag plate 42 to achieve a close connection between the roller shaft 91 and the upper drag plate 41 and the lower drag plate 42. In addition, through the cooperation of the notches 911 and the mounting holes, the roller shaft 91 and the upper drag plate 41 and the lower drag plate 42 can be relatively fixed in the horizontal direction, thereby reducing the roller shaft 91 being driven by the cam 2 to rotate relative to the upper drag plate 41 and the lower drag plate 42 when the cam 2 rotates, thereby improving the stability of the camshaft rotation.

[0033] In one embodiment of the utility model, the upper drag plate 41 and the lower drag plate 42 are connected by three positioning wheel assemblies 9, and the three positioning wheel assemblies 9 are distributed in an isosceles triangle, and two of the positioning wheel assemblies 9 are located at the end of the strip hole 43 away from the piston 6, which is the base of the isosceles triangle. The cam 2 is provided with positioning grooves that are respectively abutted against the two positioning wheel assemblies 9 on the base. The cam 2 is rotated and the two positioning wheel assemblies 9 are respectively slid into one of the two positioning grooves to realize the forward and reverse rotation and positioning of the cam 2, thereby realizing a 180° rotation of the door leaf. The other positioning wheel assembly 9 is located at one end of the strip hole 43 close to the piston 6 and is located on the center line of the two bottom positioning wheel assemblies 9, which is used for positioning when the cam 2 rotates 90° and the door leaf is closed, thereby realizing accurate closing of the door leaf.

[0034] In other embodiments, the upper drag plate 41 and the lower drag plate 42 may be connected via two positioning assemblies, and two positioning wheel assemblies 9 are respectively located at both ends of the strip hole 43 for abutting against the cam 2 to achieve 180° rotation of the door leaf.

[0035] 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, comprising a housing, and a carriage assembly, a connecting rod, a piston and a camshaft respectively arranged in the housing, wherein the housing is provided with a pressure cap at one end close to the carriage assembly, and an end cap at one end of the housing away from the carriage assembly, an annular oil circuit is provided between the housing and the piston, an oil port communicating with the annular oil circuit is provided on the housing, a speed regulating valve for adjusting the amount of hydraulic oil is inserted in the oil port, the camshaft comprises a shaft body and a cam, and the shaft body part passes through the pressure cap and protrudes above the housing; the carriage assembly is connected to the camshaft, and drives the connecting rod and the piston to perform reciprocating linear motion under the drive of the cam, characterized in that: The drag plate assembly includes an upper drag plate, a lower drag plate and a positioning wheel assembly, the positioning wheel assembly includes a roller shaft and a connecting assembly, the roller shaft is connected between the upper drag plate and the lower drag plate in a vertical direction, the connecting assembly includes a first side roller made of a metal material and a second side roller made of a non-metallic material, and the first side roller is sleeved on the outer wall of the roller shaft, and the second side roller is sleeved on the outer wall of the first side roller and abuts against the cam.

2. The floor spring according to claim 1, characterized in that: The upper and lower carriages are arranged in parallel, and are respectively provided with strip holes. The upper and lower carriages are connected together through a positioning wheel assembly in a manner of clamping the cam, and the portion above and the portion below the cam on the shaft body pass through the strip holes of the upper and lower carriages respectively, and when the camshaft rotates, the cam pushes the positioning wheel assembly to make the upper and lower carriages perform reciprocating linear motion relative to the camshaft.

3. The floor spring according to claim 1, characterized in that: The shaft body includes an active part connected to the door leaf rocker arm and a driven part connected to the floor spring housing, the cam is fixedly connected to the driven part and rotates synchronously with the shaft body; a connecting groove is provided on the wall surface of the active part in contact with the door leaf rocker arm, the connecting groove includes a sound receiving part, a sound collecting part and a sound emitting part which are sequentially connected from bottom to top, and the widths of the sound receiving part and the sound emitting part gradually increase from the connection position with the sound collecting part to the direction away from the sound collecting part.

4. The floor spring according to claim 3, characterized in that: The active part has two symmetrical and flat cross-sections, and the door leaf rocker arm rotates the shaft body by pushing the cross-sections; the connecting groove is located on the cross-sections, the sound receiving part, the sound collecting part and the sound emitting part have the same depth, and the sound receiving part and the sound emitting part have the same axial size.

5. The floor spring according to claim 4, characterized in that: The active part is provided with two connecting grooves, which are symmetrically arranged on the two sections. The cross section of the active part along the axis direction of the shaft body and the center line direction of the section is an isosceles trapezoid, and the center lines of the two sections constitute the hypotenuse of the isosceles trapezoid.

6. The floor spring according to claim 5, characterized in that: The connecting groove is located in the middle of the cut surface, and one end of the sound outlet portion facing away from the sound collecting portion extends to the top surface of the active portion and is in an open shape.

7. The floor spring according to claim 1, characterized in that: Notches are provided at both ends of the roller shaft, and the upper drag plate and the lower drag plate have mounting holes respectively. The parts with notches at both ends of the roller shaft are respectively inserted into the mounting holes of the upper drag plate and the lower drag plate and are interference fit with the mounting holes.

8. The floor spring according to claim 2, characterized in that: The upper drag plate and the lower drag plate are connected by three positioning wheel assemblies, and the three positioning wheel assemblies are distributed in an isosceles triangle. The extension line of the connecting rod constitutes the perpendicular bisector of the isosceles triangle, and two of the positioning wheel assemblies are located at the end of the strip hole away from the piston.

9. The floor spring according to claim 2, characterized in that: The upper drag plate and the lower drag plate are connected via two positioning wheel assemblies, and the two positioning wheel assemblies are respectively located at two ends of the strip hole.

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