Stepless speed regulation device of bench drilling machine

Abstract

The utility model discloses a stepless speed regulation device of a bench drilling machine, which comprises a lower wheel provided with a shaft sleeve and an upper wheel provided with a shaft rod, and further comprises recesses arranged on the lower wheel and the upper wheel, a sheath is fixedly mounted on the lower wheel, and a pressure cavity for the sheath to be inserted is arranged on the upper wheel. According to the stepless speed regulation device of the bench drilling machine, in the process that the shaft sleeve drives the lower wheel to be close to or away from the upper wheel, the protective sleeve moves in the pressing cavity repeatedly, the protective sleeve with the upward end is used for intercepting abraded rubber, the rubber is prevented from entering a gap between the shaft sleeve and the shaft rod, and the service life of the rubber is prolonged. The inner rubber ring and the outer rubber ring matched with the end of the sheath move in the pressing cavity, so that the rubber rings are attached to the inner wall of the pressing cavity to slide and used for providing sealing treatment, small rubber rings and even sundries are prevented from invading the inner ring of the sheath, the working environment of the speed regulating wheel is effectively protected, and normal work of a main shaft is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling machines, in particular to a stepless speed regulating device for a bench-type drilling machine. Background Art

[0002] A bench drilling machine is a small drilling machine that can be placed on a workbench with a vertically arranged spindle. The speed change of the spindle causes the belt on the table-shaped speed regulating wheel to change its position to adjust the belt drive diameter and then change the transmission ratio to achieve speed regulation.

[0003] According to the publication (announcement) number: CN116251980A, the publication (announcement) date: 2023-06-13, a stepless speed regulation bench drilling machine is disclosed, comprising a base, a fixed column, an electric push rod 1, a support seat, a support plate, an electric push rod 2 and a gearbox, and also comprising a stepless speed regulation component, the stepless speed regulation component comprising a support column, a connecting block, a rotating motor, an output shaft, a fixed sleeve, an electric push rod 3, a fixing block, a driving wheel, an electric push rod 4, a connecting cylinder, a rotating shaft, a driven wheel, a connecting steel belt and a drill clamp. The present invention belongs to the technical field of drilling machines, specifically a method for facilitating the adjustment of the gearbox and ensuring the stability of the gearbox. The rotation rate of the rotating shaft can be increased by simultaneously extending the electric push rod 3 and coordinating the contraction of the electric push rod 4, and the rotation rate of the rotating shaft can be reduced by simultaneously contracting the electric push rod 3 and coordinating the extension of the electric push rod 4, thereby achieving stepless speed regulation of the rotating shaft.

[0004] In the prior art including the above-mentioned patent, during the process of the trapezoidal speed regulating wheel changing the belt diameter, the belt is also forced to be squeezed and worn on the trapezoidal side wall of the speed regulating wheel. Since the belt is a consumable item and needs to be replaced regularly, in order to ensure stable transmission, the worn belt still maintains a tight fit between the trapezoidal side wall. Therefore, the fine rubber worn off will remain in the inner ring of the belt and be pushed by the belt between the two oppositely arranged speed regulating wheels, which can easily cause the rubber to enter the gap between the shaft and the sleeve of the two speed regulating wheels, thereby interfering with the axial adjustment function of the speed regulating wheel and even interfering with the normal operation of the main shaft. Utility Model Content

[0005] The purpose of the utility model is to provide a stepless speed regulating device for a bench-type drilling machine, aiming to solve the above-mentioned problems.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A stepless speed regulation device for a bench drilling machine includes a lower wheel provided with a shaft sleeve and an upper wheel provided with a shaft rod, and also includes recesses formed on the lower wheel and the upper wheel. A sleeve is fixedly mounted on the lower wheel, and a pressure cavity for inserting the sleeve is formed on the upper wheel.

[0008] Preferably, it further comprises a sliding cavity arranged outside the pressure cavity, wherein a guard ring is slidably arranged in the sliding cavity.

[0009] Preferably, a spacer ring is provided between the pressure chamber and the sliding chamber, and the spacer ring is provided with a plurality of air holes for connecting the pressure chamber and the sliding chamber.

[0010] Preferably, the retaining ring is provided with a plurality of through holes, and the first membrane flap is fixedly installed in the through holes.

[0011] Preferably, an air supply channel for connecting to the recess and the sliding cavity is opened in the upper wheel.

[0012] Preferably, the airway port is provided with a second membrane flap.

[0013] In the above technical solution, the utility model provides a stepless speed regulation device for a bench-top drilling machine, which has the following beneficial effects: in the process of the lower wheel being driven toward / away from the upper wheel by the shaft sleeve, the sleeve repeatedly moves in the pressure chamber, so that the sleeve with the end facing upward can intercept the worn rubber, and prevent the rubber from entering the gap between the shaft sleeve and the shaft rod. The inner and outer double-layer rubber rings at the end of the sleeve are located in the pressure chamber and move, so that the rubber ring slides against the inner wall of the pressure chamber, and is used to provide sealing treatment, so as to prevent small rubber rings or even debris from invading the inner ring of the sleeve, effectively protecting the working environment of the speed regulating wheel and ensuring the normal operation of the spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0015] Figure 1 A schematic diagram of the assembly of the flywheels arranged facing each other provided by an embodiment of the present utility model;

[0016] Figure 2 A schematic side cross-sectional view of the flywheels arranged facing each other provided in an embodiment of the present utility model;

[0017] Figure 3 for Figure 2 A magnified schematic diagram of .

[0018] Description of reference numerals:

[0019] 1. Bushing; 11. Lower wheel; 2. Shaft; 21. Upper wheel; 3. Depression; 30. Belt segment; 4. Sheath; 41. Pressure chamber; 5. Spacer ring; 51. Air hole; 6. Guard ring; 61. Sliding cavity; 62. Through hole; 621. First membrane flap; 7. Air supply channel; 71. Second membrane flap. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-3 As shown, a stepless speed regulation device for a bench-top drilling machine includes a lower wheel 11 provided with a sleeve 1 and an upper wheel 21 provided with a shaft rod 2, and also includes recesses 3 formed on both the lower wheel 11 and the upper wheel 21. A sleeve 4 is fixedly mounted on the lower wheel 11, and a pressure chamber 41 for inserting the sleeve 4 is formed on the upper wheel 21.

[0022] Specifically, the sleeve 1 is sleeved on the outside of the shaft 2 and moves axially, and the lower wheel 11 and the upper wheel 21 are combined to form a speed regulation for the belt, and the lower wheel 11 and the upper wheel 21 form a belt section 30 for accommodating the belt assembly so that the belt can be adjusted. These are all existing technologies and will not be described in detail here.

[0023] Furthermore, the inner ring diameter of the sleeve 4 is the same as the inner wall diameter of the sleeve 1 so that the sleeve 4 does not interfere with the operation of the speed regulating wheel during axial movement, and double-layer rubber rings are fixedly installed on the inner ring side wall and outer ring side wall of the end of the sleeve 4.

[0024] Furthermore, the recesses 3 are arranged in a circle and are located on the terraced end face of the speed regulating wheel, and are used to collect and discharge the rubber, thereby reducing the possibility that the rubber stays on the terraced surface and is pushed by the belt.

[0025] In the process of the shaft sleeve 1 driving the lower wheel 11 to move towards / away from the upper wheel 21, the sleeve 4 repeatedly moves in the pressure chamber 41, so that the sleeve 4 with the end facing upward can intercept the worn rubber and prevent the rubber from entering the gap between the shaft sleeve 1 and the shaft 2. The inner and outer double-layer rubber rings at the ends of the sleeve 4 are located in the pressure chamber 41 and move, so that the rubber rings slide against the inner wall of the pressure chamber 41 to provide sealing treatment, thereby preventing small rubber rings or even debris from invading the inner ring of the sleeve 4, effectively protecting the working environment of the speed regulating wheel and ensuring the normal operation of the main shaft.

[0026] As an embodiment further provided by the present invention, the present invention further includes a sliding cavity 61 arranged outside the pressure cavity 41 , and a retaining ring 6 is slidably arranged in the sliding cavity 61 .

[0027] Specifically, the sliding cavity 61 is opened in the upper wheel 21, and the sliding cavity 61 and the pressure cavity 41 are on the same end surface. A plurality of tension springs are fixedly installed between the retaining ring 6 and the sliding cavity 61, and rubber rings are fixedly installed on the inner and outer rings of the retaining ring 6.

[0028] A vertically movable guard ring 6 located outside the sheath 4 is used to form a protective shield for the outside of the sheath 4, increase the difficulty of rubber climbing and intrusion, and improve the protection effect of the flywheel.

[0029] As another embodiment further provided by the present invention, a spacer ring 5 is provided between the pressure chamber 41 and the sliding chamber 61 , and a plurality of air holes 51 for connecting the pressure chamber 41 and the sliding chamber 61 are provided on the spacer ring 5 .

[0030] Specifically, the spacer ring 5 is a part of the upper wheel 21, and the air holes 51 are arranged in a circumferential manner so that the circulating air flow is evenly distributed to provide driving stability.

[0031] When the double-layer rubber membrane on the sheath 4 slides upward in the pressure chamber 41, the air flow in the pressure chamber 41 is squeezed through the air hole 51 and enters the sliding chamber 61, causing the air flow to impact the guard ring 6 and move downward, increasing the shielding range of the guard ring 6, and at this time the belt is in a state of expanded diameter.

[0032] As another embodiment further provided by the present invention, a plurality of through holes 62 are formed on the retaining ring 6 , and a first membrane flap 621 is fixedly installed in the through hole 62 .

[0033] Specifically, the first membrane flap 621 is a rubber membrane flap made of soft, wear-resistant and corrosion-resistant rubber. The prior art will not be described in detail here. The rubber membrane flap only dredges the air flow downward and is a one-way setting to ensure normal ventilation of the channel.

[0034] The airflow in the sliding cavity 61 enters the circumferentially arranged through holes 62. After the push guard ring 6 moves down to a predetermined position, the airflow blows open the first membrane petal 621. At this time, the airflow is discharged from the through hole 62 and cooperates with the belt with an enlarged diameter to give the airflow a larger working area, and blows the rubber on the terraced surface of the lower wheel 11, thereby achieving the effect of cleaning the rubber residue.

[0035] As another embodiment further provided by the present invention, an air supply passage 7 for connecting the recess 3 and the sliding cavity 61 is opened in the upper wheel 21 .

[0036] Specifically, the cross section of the air supplement channel 7 is in an upwardly bulging arc shape.

[0037] During the resetting process of the retaining ring 6, the first membrane flap 621 is closed, so the sliding cavity 61 draws in external air from the arc-shaped air supply channel 7. When the airflow carries the residual rubber in the depression 3, the arc-shaped air supply channel 7 has difficulty in climbing up, which is used to intercept the rubber and reduce the risk of the rubber entering the sliding cavity 61. In combination with the high-positioned air hole 51, the problem of the rubber entering the pressure chamber 41 can be effectively reduced.

[0038] As another embodiment further provided by the present invention, the port of the air supplement channel 7 is provided with a second membrane flap 71 .

[0039] Specifically, the second membrane flap 71 is also a rubber membrane flap, and the rubber membrane flap is also made of soft, wear-resistant and corrosion-resistant rubber. The existing technology is not described here. At the same time, it only clears the air flow inward in one direction to avoid leakage when the air hole 51 transports the air flow.

[0040] The second membrane flap 71 set at the port of the air supply channel 7 can effectively reduce the situation where the rubber enters the air supply channel 7, ensure the ventilation cleanliness of the air supply channel 7, make the sheath 4 and the retaining ring 6 more stable during operation, improve the safety of the equipment, and also improve the ventilation effect in the air supply channel 7.

[0041] Working principle: In the process of the shaft sleeve 1 driving the lower wheel 11 to move towards / away from the upper wheel 21, the sleeve 4 repeatedly moves in the pressure chamber 41, so that the sleeve 4 with the end facing upwards intercepts the worn rubber to prevent the rubber from entering the gap between the shaft sleeve 1 and the shaft rod 2, and the inner and outer double-layer rubber rings at the end of the sleeve 4 are located in the pressure chamber 41 and move, so that the rubber rings slide against the inner wall of the pressure chamber 41 to provide sealing treatment, to prevent small rubber rings or even debris from invading the inner ring of the sleeve 4, and when the double-layer rubber membrane on the sleeve 4 slides upward in the pressure chamber 41, the airflow in the pressure chamber 41 is squeezed through the air hole 51 and enters the sliding chamber 61, and the airflow impacts the downward movement of the guard ring 6, thereby increasing the downward blocking range of the guard ring 6, and at the same time the airflow in the sliding chamber 61 enters the circumferentially arranged through-holes 62, at this time the airflow is discharged from the through-holes 62 and blows the rubber on the terraced surface of the lower wheel 11.

[0042] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A stepless speed regulating device for a bench-top drilling machine, comprising a lower wheel (11) provided with a shaft sleeve (1) and an upper wheel (21) provided with a shaft rod (2), characterized in that: It also includes recesses (3) formed on both the lower wheel (11) and the upper wheel (21), a protective sleeve (4) being fixedly mounted on the lower wheel (11), and a pressure cavity (41) for inserting the protective sleeve (4) being formed on the upper wheel (21).

2. The stepless speed regulating device for a benchtop drilling machine according to claim 1, characterized in that: It also includes a sliding cavity (61) arranged outside the pressure cavity (41), and a guard ring (6) is slidably arranged in the sliding cavity (61).

3. The stepless speed regulating device for a benchtop drilling machine according to claim 2, characterized in that: A spacer ring (5) is provided between the pressure chamber (41) and the sliding chamber (61), and a plurality of air holes (51) for communicating with the pressure chamber (41) and the sliding chamber (61) are provided on the spacer ring (5).

4. The stepless speed regulating device for a benchtop drilling machine according to claim 3, characterized in that: The retaining ring (6) is provided with a plurality of through holes (62), and a first membrane flap (621) is fixedly installed in the through hole (62).

5. The stepless speed regulating device for a bench-type drilling machine according to claim 4, characterized in that: An air supply passage (7) for communicating with the recess (3) and the sliding cavity (61) is provided in the upper wheel (21).

6. The stepless speed regulating device for a benchtop drilling machine according to claim 5, characterized in that: The port of the air supply channel (7) is provided with a second membrane flap (71).

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